CN1642052A - Multi-path searching method, device for realizing same and mobile communication terminal device - Google Patents
Multi-path searching method, device for realizing same and mobile communication terminal device Download PDFInfo
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Abstract
The invention supplies multi-diameter searching method, realization device and mobile communication terminal device in the spread spectrum code division multiple access motile communication system by the transmitting antenna diversity technique. It is used the pilot signal distributed to the transmitting antenna by the base station and the output signal of the de-spread part of the receiver to do the correlative calculation, separate the receiving signal corresponding to the transmitting antenna; each of the above separated antenna receiving signal is respectively disposed to generate power delay spectrum corresponding to each of the transmitting antenna; each of the power delay spectrum is composed to gain the complex power delay spectrum. The multi-diameter signal is effectively selected base on the above complex power delay spectrum. Then the sequence information of the selected signal is supplied with the RAKE receiver. This can realize high precision multi-diameter by adopting the spread spectrum code division multiple access mobile communication system, and increase the receptivity of the RAKE receiver.
Description
One, technical field:
The present invention relates to a kind of wireless communication technology, more specifically be meant multipath searching method, implement device and mobile communication terminal device, be applicable to the mobile communication terminal device in the spread spectrum code division multiple access communication system that adopts the transmitting antenna diversity technique, realize high-precision Multipath searching and high performance reception processing.
Two, background technology:
One of in recent years,, use Direct-Spread code division multiple access (DS-CDMA) technology at moving communicating field, and the wide three big international standards that have been adopted as the 3rd third-generation mobile communication system for the Wideband Code Division Multiple Access (WCDMA) of 5MHz (W-CDMA) system of spread spectrum bands of a spectrum.
Be in the typical spread spectrum code division multiple access mobile communication system with W-CDMA, after sending from the base station with the signal after the spread symbol spread processing, through Rayleigh multipath propagation environment (the various barriers that exist between base station office and the portable terminal, as building or various ground type landforms, can produce the multipath delay time signal different to the emission of radio signal or refraction and reach receiving terminal with phase place.This communication environments is called as the Rayleigh multipath propagation environment), arrive portable terminal as receiving terminal, these multipath signal phase mutual interference make the received signal level of portable terminal that fierce change can take place in time, this phenomenon is called as the Rayleigh fading phenomenon.
The Rayleigh fading phenomenon can make the receptivity severe exacerbation of receiver, in order to address this problem, receiver adopts the Multipath searching technology, detect the time of delay of each multipath signal, based on the time of delay of being detected, receiver carries out despreading respectively to multipath signal and handles phase compensation, it is synthetic then all multipath signals to be concerned with, to improve the receptivity of receiver.
If but the precision of Multipath searching technology is not enough, make that noise signal is selected and it is relevant synthetic to be used for, receptivity is worsened, and therefore, high-precision Multipath searching technology is to realize the key of high accuracy RAKE receiver in the spread spectrum code division multiple access mobile communication system.
In the spread spectrum code division multiple access mobile communication system, base station office adopts the transmitting antenna diversity technique usually---promptly send identical information to portable terminal simultaneously from two antennas, help portable terminal and overcome the Rayleigh fading phenomenon to improve receptivity, in this case, the Multipath searching technology remains necessary.Be that example illustrates content of the present invention mainly below, but content of the present invention can be applicable to all spread spectrum code division multiple access mobile communication system with the W-CDMA system.
Three, summary of the invention:
The key problem in technology that the present invention will solve is:
1. provide about adopt the embodiment of the Multipath searching technology under the transmitting antenna diversity technique condition in the base station;
2. be provided at the base station and adopt the implement device that carries out high-precision Multipath searching under the diversity antenna technology condition, thereby realize the mobile communication terminal device of high quality communication.
When adopting the transmitting antenna diversity technique in the base station, mutually orthogonal pilot signal patterns is assigned to two antennas, these pilot signals and common user profile through spread spectrum and modulation after, come out from two antenna transmission, mix the antenna end that ground arrives receiver behind these signals process Rayleigh multipath propagation environments.The present invention is based on this mixing received signal, through despreading processings, each aerial signal separating treatment, power-delay spectrum generate and handle, the power-delay spectrum is syntheticly handled, effectively multipath becomes realization Multipath searchings such as component selections processing.
It is that the spreading code used when adopting known base station to generate spread-spectrum signal and the conjugate complex number multiplication of received signal are realized that described despreading is handled; Utilizing in described mutually orthogonal pilot signal patterns and the output signal that despreading is handled the part of corresponding pilot signal block to carry out the conjugate complex number multiplication respectively separates to realize each aerial signal, to each aerial signal after separating, carry out following processing respectively: at first by in the certain hour zone, asking average mode to calculate received signal average power corresponding to a certain possible multipath signal sequential, then all possible multipath signal sequential is calculated corresponding received signal average power respectively, these all received signal average powers promptly constitute the power-delay spectrum of received signal.
Handle in that power-delay spectrum is synthetic, the power-delay spectrum is generated the power-delay spectrum of handling each antenna that is generated synthesize and obtain synthetic power-delay and compose.
Become in the component selections processing at effective multipath at last the synthetic power-delay that generates is previously composed according to effective multipath composition selective rule, determine to be used for effective multipath signal sequential that RAKE receives.
Based on above-mentioned processing, the present invention is used for adopting the spread spectrum code division multiple access mobile communication system system of transmitting antenna diversity technique, can realize high-precision Multipath searching.
In the present invention, described pilot signal patterns and corresponding pilot signal block, both can use the private subscribers pilot frequency mode that adopted in the private subscribers physical channel and correspondingly the dedicated pilot signal piece that each time slot comprised of private subscribers physical channel or a part wherein, also can use a common pilot signal piece that common pilot pattern that all user's common pilot channel of a base station intra-office are adopted and corresponding common pilot channel transmitted or a part wherein.
In the present invention, described pilot signal patterns and corresponding pilot signal block, also can use above-mentioned two kinds of pilot signal patterns and corresponding frequency pilot sign piece simultaneously, in this occasion, the generation that utilizes above-mentioned two kinds of pilot signal patterns and corresponding pilot signal block to carry out the power-delay spectrum is handled to walk abreast simultaneously and is carried out, and also can divide the time serial to carry out.
In the present invention, described power-delay spectrum generates to handle and comprises following processing: the coherence average between the same phase constituent of the pilot signal block of (1) each aerial signal after to described separation and the corresponding sampled value that orthogonal component carries out the chip period in every interval in the certain hour interval respectively; (2) calculate instantaneous signal power by described coherence average value with phase constituent and orthogonal component; (3) described instantaneous signal power is carried out average computation average power signal in the certain hour interval; (4) corresponding each possible multipath composition sequential repeats the processing of (1)～(3), obtains the average signal power of corresponding each possible multipath composition sequential; The average signal power of these corresponding all possible multipath composition sequential promptly constitutes the power-delay spectrum.The processing of above-mentioned (1)～(3) can reduce the influence of noise and interference signal effectively.
Among the present invention, described multipath is selected to handle and comprised following processing: (1) selects to be higher than the sampling point of threshold value from described synthetic power-delay spectrum; (2) according to the described chosen relative position of sampling point in described synthetic power-delay spectrum, and the zero-time of whole Multipath searching processing calculates the sequential corresponding to effective multipath signal of the described sampling point that respectively is selected.
In addition, the coherence average in (1) step was handled and also can be omitted during above-mentioned power-delay generated and handles, and directly directly carry out the instantaneous signal power calculation based on the same phase constituent of the pilot signal block of each aerial signal after the described separation and each corresponding sampled value of orthogonal component, and then carry out an average computation average power signal in regularly, and further generate the power-delay spectrum based on instantaneous signal power.
The present invention adopts under the diversity antenna technology condition in the base station, the device for carrying out said that carries out high-precision Multipath searching is based on above-mentioned Multipath searching technical scheme, realize the implement device of every processing in the above-mentioned Multipath searching technical scheme, with have the semiotic function that receives in the spread spectrum code division multiple access mobile communication system system from base station, and have the mobile communication terminal device that carries out the described Multipath searching device for carrying out said of Multipath searching based on described received signal.
Four, description of drawings:
Accompanying drawing 1 is the concept map of W-CDMA system involved in first example
Accompanying drawing 2 is wireless frame structure schematic diagrames of downlink dedicated physical channels
The schematic diagram of the accompanying drawing 3 dedicated pilot symbol piece that to be dedicated pilot symbol pieces of being transmitted from the private subscribers channel of the 1st antenna transmission when the transmitting antenna diversity technique is adopted in the base station in the W-CDMA system transmitted with private subscribers channel from the 2nd antenna transmission
Accompanying drawing 4 is from the signal that common pilot channel transmitted of the 1st antenna transmission and schematic diagram from the correlation of the signal that common pilot channel transmitted of the 2nd antenna transmission when base station office adopts the transmitting antenna diversity technique in the W-CDMA system
Accompanying drawing 5 is summary module figure of the mobile communication terminal device in the accompanying drawing 1
Accompanying drawing 6 is summary module figure of the base band signal process part of mobile communication terminal device shown in the accompanying drawing 5
Accompanying drawing 7 is the summary module figure of Multipath searching module PSR among the summary module figure partly of base band signal process shown in the accompanying drawing 6
Accompanying drawing 8 is module structure draftings of the despreading processing module among the summary module figure shown in the accompanying drawing 7
Accompanying drawing 9 is module structure draftings of the pilot frequency mode demodulation module among the summary module figure shown in the accompanying drawing 7
Accompanying drawing 10 is concept maps of the received signal power average treatment of common pilot signal piece in the 1st example
Accompanying drawing 11 is concept maps of the received signal power average treatment of special-purpose pilot signal block in the 1st example
Accompanying drawing 12 is summary module figure of Multipath searching module in the 2nd example
Accompanying drawing 13 is concept maps of the received signal power average treatment of common pilot signal piece in the 2nd example
Accompanying drawing 14 is concept maps of the received signal power average treatment of special-purpose pilot signal block in the 2nd example
Five, embodiment:
The 1st example:
With reference to the accompanying drawings 1, in the W-CDMA system of the employing transmitting antenna diversity technique that the present invention was suitable for, base station BS sends wireless signals with two antenna A1 and A2 to mobile communication terminal device 100 simultaneously.
The transmitting antenna diversity technique can be an open loop transmitting antenna diversity STTD mode, also can be closed loop transmitting antenna diversity mode 1 or 2 (referring to 3GPP TS 25211 " Physical channels and mapping of transport channel ontophysical channels (FDD) " and 3GPP TS 252 14 " Physical Layer Procedure (FDD) ").
In the W-CDMA system, between base station BS and the mobile communication terminal device 100, transmit information by some physical channels, comprising DPCH and common pilot channel, wherein DPCH is a two-way channel.The present invention only relates to 100 DPCH that send from base station BS toward mobile communication terminal device, so be referred to as downlink dedicated physical channels in the following description.
The transmission of downlink dedicated physical channels is that unit carries out with the radio frames.With reference to the accompanying drawings 2, the wireless frame structure of down link is by 15 time slot Slot
j(j=0 ... 14) constitute, each time slot is made of Data1 territory, TPC territory, TFC1 territory, Data2 territory and Pilot territory.The dedicated pilot symbol that transmits by whole Pilot territory is referred to as dedicated pilot symbol piece DPB, and the signal mode that these dedicated pilot symbols constituted is referred to as dedicated pilot symbol pattern DPP.In addition, different time-gap Slot in the same radio frames
jThe dedicated pilot symbol pattern that is transmitted may be different.And from the identical time slot Slot of different antennae
jThe dedicated pilot symbol pattern that is transmitted is also different.Below mention from antenna A
iThe time slot Slot of a certain radio frames of (i=1,2)
jThe dedicated pilot symbol pattern that is transmitted is referred to as DPP (i, j), and DPP (i, j) repeats to transmit in the cycle.
With reference to the accompanying drawings 3, in STTD transmitting antenna diversity mode and closed loop transmitting antenna diversity mode 1, DPP (1, j) and DPP (2, j) are quadratures each other, and in closed loop transmitting antenna diversity mode 2, DPP (1, j) and DPP (2, j) are identical.
The transmission of common pilot channel also is to be that unit carries out with the radio frames.With reference to the accompanying drawings 4, the wireless frame structure of common pilot signal is by 15 time slot Slot
j(j=0 ... 14) constitute, all time slots of common pilot channel all are used for transmitting the common pilot symbol, and the common pilot symbol that transmits from each time slot constitutes common pilot symbolic blocks CPB.The part of this common pilot symbolic blocks CPB is called partial common frequency pilot sign piece PCB, the signal mode that common pilot symbol among the common pilot symbolic blocks CPB constitutes is referred to as common pilot pattern of symbol CPP, and the common pilot pattern of symbol among the partial common frequency pilot sign piece PCB is referred to as partial common pilot frequency mode PCP.Different time slot Slot in the same radio frames
jThe common pilot pattern of symbol that transmitted may be different, and from the identical time slot Slot of different antennae
jThe common pilot pattern of symbol that is transmitted is also different.From antenna A
iThe time slot Slot of a certain radio frames of (i=1,2)
jCommon pilot pattern of symbol that is transmitted and partial common pilot symbol patterns time-division are not referred to as CPP (i, j) and PCP (i, j), and CPP (i, j) and PCP (i, j) repeat to transmit in the cycle.
With reference to the accompanying drawings 4, in the W-CDMA system that adopts the transmitting antenna diversity technique, through after the identical spreading code spread processing, two antennas from base station BS send to mobile communication terminal device 100 by common pilot signal simultaneously for two kinds of mutually orthogonal common pilot pattern of symbol CPP (1, j) and CPP (2, j).
With reference to the accompanying drawings 5, described mobile communication terminal device 100, include antenna 81, with processing modules such as antenna 81 consecutive transmissions/receptions switch dual multiplexer 82, radio frequency receiving processor 83, radio frequency transmission processor 84 and baseband signal processor 85.
The effect of described transmission/reception switch dual multiplexer 82 is to separate to send processor 84 by radio frequency and flow to the transmission current signal of antenna 81 and flow to the received current signal of radio frequency receiving processor 83 by antenna 81, to prevent that receiving and send signal mixes.
Described radio frequency receiving processor 83 is by the received signal subcarrier synthesizer, frequency frequency mixer, QPSK quadrature demodulator and some amplifiers and the filter that carry out conversion constitutes to received signal.This formation of radio frequency receiving processor 83 is known by the people, does not just elaborate here.Radio frequency receiving processor 83 is transformed into baseband signal RS with radio frequency receiving signal, and exports to baseband signal processor 85, and baseband signal RS is a complex signal, is made of same phase constituent (I) RSI and orthogonal component (Q) RSQ.
Described radio frequency sends processor 84, by the QPSK quadrature modulator, carry out the frequency mixer of conversion to sending signal frequency, send signal carrier synthesizer and some amplifiers and filter and constitute.Radio frequency sends this formation of processor 84 to be known by the people, does not just elaborate here.Radio frequency sends processor 84 will be transformed into radio frequency transmit signal from the baseband signal TS of base band signal process portion 85 inputs according to control signal CS, DT etc. from 85 inputs of base band signal process portion, and export to antenna 81, baseband signal TS is a complex signal, is made of same phase constituent (I) TSI and orthogonal component (Q) TSQ.
In addition, mobile communication terminal device 100 also comprises the microprocessor (MPU) 86, digital signal processor (DSP) 87 and the coder/decoder (CODEC) 88 that are connected with baseband signal processor 85.
86 pairs of mobile communication terminal device integral body of described microprocessor MPU are controlled, and input units such as keyboard 92 are connected with MPU86 with output display devices 91 such as LCDs.After the data that the user of mobile communication terminal device 100 imports by input unit 92 were sent to MPU86, MPU86 sent these data contents to baseband signal processor 85 in display unit 91 or with data according to the type of input data.
Described DSP87 is responsible for the part digital signal relevant treatment of baseband signal processor 85 under MPU86 control.
Described CODEC88 is connected between baseband signal processor 85 and loud speaker 93 and the microphone 94, be responsible for coding, the decoding processing of speech signal, that is to say: convert analog voice signal to by CODEC88 from the digitized voice signal of baseband signal processor output, output to loud speaker 93 then, transfer sound to; Convert audio digital signals to and offer baseband processor 85 after handling by the CODEC88 sample code by the analog voice signal of microphone 94 input.
With reference to the accompanying drawings 6, include as lower module in the described baseband signal processor 85: the analog signal RS by 83 outputs of radio frequency receiving signal processor is carried out analog to digital converter (A/D) 1, cell search module (CSR) 2, Multipath searching module (PSR) 3, broadcast channel receiving processing module (BCHRR) 4, the private subscribers channel receiving processing module (TCHRR) 6 that sample quantization handles and receive handling cache module (RBUF) 5 etc.; Sending processing exports to the transmission processing buffer memory (TBUF) 9 of the baseband signal TS of radio frequency transmit signal processor 84, sends band spectrum modulation processing (TR) 8, sends low pass shaping filter (RNF) 7 and compositions such as the controller (CTRL1) 11 that baseband signal processor 85 is controlled comprehensively, control module (RFC) 10 with generation.
Described analog to digital converter (A/D) 1 comprises two analog to digital converters (A/D), and one of them is used for the same phase constituent RSI sample quantization of baseband signal RS is handled, and another is used for the sample quantization of the orthogonal component RSQ of baseband signal RS is handled.The result baseband digital signal RSD of 1 couple of baseband signal RS of analog to digital converter (A/D) is exported to modules such as cell search module (CSR) 2, Multipath searching module (PSR) 3, control channel receiving processing module (BCHRR) 4, private subscribers channel receiving processing module (TCHRR) 6.Baseband digital signal RSD also is divided into phase constituent RDI and orthogonal component RDQ, and wherein RDI is the result to the same phase constituent RSI of baseband signal RS, and RDQ is the result to the orthogonal component RSQ of baseband signal RS.
Described cell search module (CSR) 2 is carried out synchronous detecting is appropriate to carry out with it wireless connections with search base station based on the signal of first synchronizing channel (P-SCH) that is comprised among the baseband signal RS, SSC Secondary Synchronisation Code (S-SCH) and common pilot channel.This processing procedure is called as search of initial zone.The purpose of search of initial zone is to detect the used scrambler sequence in the frame synchronization clock signal CTRLS2 of the described base station that is appropriate to carry out with it wireless connections and this base station number.Comprise modules such as matched filter in the cell search module (CSR) 2 and carry out above-mentioned processing.Except above-mentioned search of initial zone, cell search module (CSR) 2 also is responsible for carrying out needed peripheral cell search when soft handover.
Cell search module (CSR) 2 detected frame synchronization sequential are exported to modules such as Multipath searching module (PSR) 3, control channel receiving processing module (BCHRR) 4, private subscribers channel receiving processing module (TCHRR) 6.In addition, the detected scrambler sequence of cell search module (CSR) 2 number then transmits MPU86 by MPU bus B 2 and MPU interface.
Described Multipath searching module (PSR) 3 is after search of initial zone, based on the accurate sequential of the time delay that is produced in the Rayleigh multipath transmission path between frame synchronization clock signal CTRLS2 detection is from the base station to the mobile communication terminal each multipath composition inequality.The detailed formation of this Multipath searching module (PSR) 3 will be explained below.
Comprise modules such as sliding correlation detector, coherent demodulator and RAKE synthesizer in the described control channel receiving processing module (BCHRR) 4.Extract the control information data (following writing demodulation control data) that sends out from the base station by digital baseband signal RSD being carried out processing such as despreading, coherent demodulation and RAKE synthesize, these data at first are stored to receive and handle in the buffer memory 5, send MPU86 to by MPU bus B 2 and MPU interface then.MPU86 is based on the control of these control informations to 100 kinds of various kinds of mobile communication terminal.
Comprise modules such as sliding correlation detector, coherent demodulator and RAKE synthesizer in the described private subscribers channel receiving processing module (TCHRR) 6.Extract the user data (following writing demodulation user data) that sends out from the base station by digital baseband signal RSD being carried out processing such as despreading, coherent demodulation and RAKE synthesize, these data at first are stored in receiving processing buffer memory 5, send MPU86 to by MPU bus B 2 and MPU interface then, perhaps send DSP87 to be further processed by dsp bus B1 or dsp interface 13.
Comprise the processing modules such as low pass shaping filter that exerciser that the spread spectrum computing is used and shaping filter are used in described transmission band spectrum modulation processing (TR) module 8.User data transmits and temporarily is kept at by dsp bus the transmission processing buffer memory 9 by MPU bus B 2 or from DSP87 from MPU86 or CODEC.The spreading code and these data that send the 8 usefulness appointments of band spectrum modulation processing (TR) module are carried out complex multiplication operation to realize spread processing.With the low pass shaping filter data that spread processing generated being carried out shaping filter then handles generation baseband transmit signals TS and exports to radio frequency transmission processing module 84.
Described control module RFC based on the order that sends by MPU interface or MPU bus from MPU86, generates control signal CS, the DT etc. of the action of controlling radio frequency transmission processing module 84 and sends radio frequency transmission processing module 84 to.
Described control module CTRL1 carries out above-mentioned control control in addition then based on the order that sends by MPU interface or MPU bus from MPU86 to mobile communication terminal device integral body.
With reference to the accompanying drawings 7, described Multipath searching module 3 comprises with lower module: (a) with analog to digital converter output signal RSD (RDI, RDQ) the temporary transient input-buffer of preserving 21; (b) data RDI and the RDQ that two outputs of input-buffer 21 are exported carries out the despreading processing module 22 that despreading is handled respectively, and this module output is corresponding to despreading result ISI and the ISQ of RDI and RDQ; (c) the pilot frequency mode demodulation module 23, the pilot frequency mode of distributing to each antenna when this module utilizes known base station to send carries out complex conjugate multiplication to remove the pilot frequency mode modulation composition among ISI and the ISQ with the part of the corresponding pilot signal block of despreading result ISI and ISQ, and the output signal of corresponding two antennas is respectively PLI1, PLQ1 and PLI2, PLQ2; (d) the coherence average arithmetic unit 24 that respectively PLI1, PLQ1 and PLI2, PLQ2 is carried out the coherence average computing
1With 24
2, the coherence average computing is that unit carries out with the symbol; (e) to coherence average computing complex result (IAI
1, IAQ
1) and (IAI
2, IAQ
2) average the power averaging module 25 of power calculation
1With 25
2(f) power-delay spectrum maker module 26, comprise the average module 25 of storage power in this module
1With 25
2Output result's buffer memory 26
1With 26
2(g) power-delay spectrum synthesis module 27, the power-delay spectrum of each antenna that this module will generate is respectively synthesized processing, generates the synthetic power-delay spectrum of the unification of selecting in order to multipath.
In this example, multipath is selected to handle and is realized by software by MPU86.
In addition, input signal as the Multipath searching module, except receiving baseband signal RSD, also has the reference clock signal that generates by reference clock maker (showing in the drawings) and by frame synchronization clock signal CTRLS2 that cell search module provided etc.Based on these clock signals, the Multipath searching module is determined the position of pilot signal block in frame boundaries, boundary of time slot and the received signal, and correctly carries out Multipath searching and handle.
With reference to the accompanying drawings 8, described despreading processing module comprises with lower module: (1) matched filter 31; (2) common pilot channel spread symbol maker 33C; (3) private subscribers pilot channel spread symbol maker 33D; (4) MUX 32.Use the plural spread symbol of spread symbol maker 33D generation to (CSCI is CSCQ) with (DSCI DSCQ) inputs to MUX 32 with spread symbol maker 33C and private subscribers pilot channel by common pilot channel respectively.MUX 32 by the instruction SMC that MPU bus B 2 or MPU interface 12 send, selects described two pairs of plural spread symbol to (CSCI is CSCQ) with (CSCI, CSCQ) a pair of matched filter 31 of exporting in according to MPU86.Based on above-mentioned formation, despreading processing module 22 by matched filter use the above-mentioned a pair of plural spread symbol of selecting by MUX 32 pair and baseband receiving signals to (RDI RDQ) carries out despreading and handles, and output despreading result (ISI, ISQ).
With reference to the accompanying drawings 9, described pilot frequency mode demodulation module is by the pilot frequency mode demodulation module 23 of corresponding first antenna
1Pilot frequency mode demodulation module 23 with corresponding first antenna
2Constitute.
Described pilot frequency mode demodulation module 23
1Comprise with lower module: (1) complex multiplier 41
1(2) the conjugate complex number signal generator 43C of the pilot frequency mode modulation signal of common pilot channel from the signal that first antenna A1 sends
1, this maker generate described from the signal that first antenna A1 sends the conjugate complex number signal (CCPI of the pilot frequency mode modulation signal of common pilot channel
1, CCPQ
1); (3) the conjugate complex number signal generator 43D of the pilot frequency mode modulation signal of pilot signal block in special-purpose user's pilot channel from the signal that first antenna A1 sends
1, this maker generate described from the signal that first antenna A1 sends the conjugate complex number signal (DCPI of the pilot frequency mode modulation signal of common pilot channel
1, DCPQ
1).Conjugate complex number signal (the CCPI of described two pairs of pilot frequency mode modulation signals
1, CCPQ
1) and (DCPI
1, DCPQ
1) input to MUX 41
1, MUX 41
1The instruction SMC that sends by MPU bus B 2 or MPU interface 12 according to MPU86 is from described two couples of plural complex signal (CCPI
1, CCPQ
1) and (DCPI
1, DCPQ
1) a pair of conduct (SCPI of middle selection
1, SCPQ
1), export to complex multiplier 41
1Based on above formation, pilot frequency mode demodulation module 23
1Make the despreading result (ISI, ISQ) with by MUX 41
1(the SCPI of selected output
1, SCPQ
1) carry out complex multiplication and integral operation, generate and output complex signal (PLI
1, PLQ
1).
Described pilot frequency mode demodulation module 23
2With described pilot frequency mode demodulation module 23
1Have identical formation, comprise: (1) complex multiplier 41 with lower module
2(2) the conjugate complex number signal generator 43C of the pilot frequency mode modulation signal of common pilot channel from the signal that first antenna A2 sends
2, this maker generate described from the signal that first antenna A2 sends the conjugate complex number signal (CCPI of the pilot frequency mode modulation signal of common pilot channel
2, CCPQ
2); (3) the conjugate complex number signal generator 43D of the pilot frequency mode modulation signal of pilot signal block in special-purpose user's pilot channel from the signal that first antenna A2 sends
2, this maker generate described from the signal that first antenna A2 sends the conjugate complex number signal (DCPI of the pilot frequency mode modulation signal of common pilot channel
2, DCPQ
2).Conjugate complex number signal (the CCPI of described two pairs of pilot frequency mode modulation signals
2, CCPQ
2) and (DCPI
2, DCPQ
2) input to MUX 41
2, MUX 41
2The instruction SMC that sends by MPU bus B 2 or MPU interface 12 according to MPU86 is from described two couples of plural complex signal (CCPI
2, CCPQ
2) and (DCPI
2, DCPQ
2) a pair of conduct (SCPI of middle selection
2, SCPQ
2), export to complex multiplier 41
2Based on above formation, pilot frequency mode demodulation module 23
2Make the despreading result (ISI, ISQ) with by MUX 41
2(the SCPI of selected output
2, SCPQ
2) carry out complex multiplication and integral operation, generate and output complex signal (PLI
2, PLQ
2).
Based on above-mentioned formation, Multipath searching module 3 under the control of MPU86 as described below mode carry out Multipath searching.Below Shuo Ming prerequisite is: the cell search process after (1) mobile communication terminal 100 power-on successfully finishes, and has determined the base station that is attached thereto; (2) Multipath searching module 3 has obtained the frame synchronization clock signal of described base station.
Describe with regard to the action that utilizes partial common frequency pilot sign piece PCB to carry out Multipath searching Multipath searching module when handling below.
At first, MPU86 sends the SMC command signal by MPU interface 12 or MPU bus B 2 to despreading processing module 22 and pilot frequency mode demodulation module 23, indicates this two module to utilize partial common frequency pilot sign piece PCB to carry out Multipath searching and handles.According to the SMC command signal, MUX 32 select common pilot channel with spread symbol to (CSCI CSCQ) exports to matched filter 31; At pilot frequency mode demodulation module 23
1In, MUX 42
1Select the conjugate complex number signal (CCPI of the pilot frequency mode modulation signal of respective antenna A1
1, CCPQ
1) offer complex multiplication operation device 41
1At pilot frequency mode demodulation module 23
2In, MUX 42
2Select the conjugate complex number signal (CCPI of the pilot frequency mode modulation signal of respective antenna A2
2, CCPQ
2) offer complex multiplication operation device 41
2
When baseband receiving signals to (RSI, when RSD) being transfused to the Multipath searching processing module, these signals are at first temporarily left in the input-buffer 21.After certain data (such as needed data are handled in a despreading or a Multipath searching is handled needed data) all were filled with, these signals were transferred into despreading processing module 22.Despreading processing module 22 is based on reference clock signal with by control signal CTRLS2 (slot synchronization signal, frame synchronizing signal etc.) that cell search module 2 provided, carry out baseband receiving signals to (RSI by matched filter, RSD) with common pilot channel with spread symbol to (CSCI, CSCQ) related operation between.Then, as related operation result's despread signal to (ISI ISQ) is exported to pilot frequency mode demodulation module 23.
At pilot frequency mode demodulation module 23
1In, by complex multiplication operation device 41
1Carry out despread signal to (ISI is ISQ) with the conjugate complex number signal (CCPI of the pilot frequency mode modulation signal of described respective antenna A1
1, CCPQ
1) between complex multiplication and integral operation.Then, operation result (PLI
1, PLQ
1) be exported to coherence average arithmetic unit 24
1
On the other hand, at pilot frequency mode demodulation module 23
2In, by complex multiplication operation device 41
2Carry out despread signal to (ISI is ISQ) with the conjugate complex number signal (CCPI of the pilot frequency mode modulation signal of described respective antenna A2
2, CCPQ
2) between complex multiplication and integral operation.Then, operation result (PLI
2, PLQ
2) be exported to coherence average arithmetic unit 24
2
Coherence average arithmetic unit 24
1To signal to (PLI
1, PLQ
1) same phase constituent PLI
1With orthogonal component PLQ
1Carrying out respectively with the symbol is the coherence average computing of unit period.It is interval long generally can be set at several time slots during the average calculating operation.Such as, as shown in figure 10 be at continuous 4 time slot interval (Slot
K-2, Slot
K-1, Slot
K, Slot
K+1) in, to preceding two time slot (Slot
K-2, Slot
K-1) and latter two time slot (Slot
K, Slot
K+1) corresponding partial common pilot signal block (PCB
K-2, PCB
K-1) and (PCB
K, PCB
K+1) carry out respectively with the symbol be unit period respectively at phase constituent PLI
1With orthogonal component PLQ
1The coherence average computing.
On the other hand, the coherence average arithmetic unit 24
2To signal to (PLI
2, PLQ
2) same phase constituent PLI
2With orthogonal component PLQ
2Carrying out same as described above respectively is the coherence average computing of unit period with the symbol.
Coherence average arithmetic unit 24
1With coherence average arithmetic unit 24
2Operation result export to power averaging module 25 respectively
1With 25
2
In power averaging module 25
1, at first according to the same phase constituent IAI of each data sample of coherence average operation result
1With orthogonal component IAQ
1Calculate instantaneous power.Then, these instantaneous power data samples are averaged the average power of computing in the hope of received signal.Such as, as shown in figure 10,, try to achieve the average signal power in 4 time slot intervals at last based on the coherence average operation result.Resulting average signal power AVP
1From power averaging module 25
1Output is also stored the buffer memory 26 that power-delay is composed maker 26 into
1In.
On the other hand, identical with said process, in power averaging module 25
2, at first according to the same phase constituent IAI of each data sample of coherence average operation result
2With orthogonal component IAQ
2Calculate instantaneous power.Then, these instantaneous power data samples are averaged the average power of computing in the hope of received signal.Such as, as shown in figure 10,, try to achieve the average signal power in 4 time slot intervals at last based on the coherence average operation result.Resulting average signal power AVP
2From power averaging module 25
2Output is also stored the buffer memory 26 that power-delay is composed maker 26 into
2In.
The above processing procedure has generated the average signal power of a corresponding possible multipath composition sequential to (AVP
1, AVP
2).At each may multipath composition sequential repeat average signal power that above-mentioned processing procedure generates corresponding all possible multipath composition sequential to and be stored in the buffer memory 26 of power-delay spectrum maker 26 respectively by the temporal sequencing of each possible multipath composition sequential
1With 26
2In, then at buffer memory 26
1With 26
2In generated the power-delay spectrum PDF of the received signal of the corresponding first antenna A1 respectively
1Power-delay spectrum PDF with the received signal of the second antenna A2
2
Power-delay spectrum PDF based on above-mentioned generation
1And PDF
2, power-delay spectrum synthesis module carries out synthetic the processing with generation of power-delay spectrum and is used for the synthetic power-delay spectrum PDF that last multipath is selected, and sends MPU to by MPU bus or MPU interface.
MPU selects the average signal power sampling point above pre-set threshold from above-mentioned synthetic power-delay spectrum PDF, and selects the clock signal that finally is used for the synthetic effective multipath composition of RAKE according to relative size and their relative positions in synthetic power-delay spectrum PDF of these average signal power sampling points.Afterwards, MPU sends the clock signal of selected effective multipath composition to control channel receiving processing module 4 and subscriber channel receiving processing module 6.Like this, 6 of control channel receiving processing module 4 and subscriber channel receiving processing modules receive processing to above-mentioned effective multipath composition, and it is synthetic to carry out RAKE at last.
Next describe with regard to the action that utilizes dedicated pilot symbol piece DPB to carry out Multipath searching processing Multipath searching module.
At first, MPU86 sends the SMC command signal by MPU interface 12 or MPU bus B 2 to despreading processing module 22 and pilot frequency mode demodulation module 23, indicates this two module to utilize dedicated pilot symbol piece PCB to carry out Multipath searching and handles.According to the SMC command signal, MUX 32 select common pilot channel with spread symbol to (DSCI DSCQ) exports to matched filter 31; At pilot frequency mode demodulation module 23
1In, MUX 42
1Select the conjugate complex number signal (DCPI of the pilot frequency mode modulation signal of respective antenna A1
1, DCPQ
1) offer complex multiplication operation device 41
1At pilot frequency mode demodulation module 23
2In, MUX 42
2Select the conjugate complex number signal (DCPI of the pilot frequency mode modulation signal of respective antenna A2
2, DCPQ
2) offer complex multiplication operation device 41
2
When baseband receiving signals to (RSI, when RSD) being transfused to the Multipath searching processing module, these signals are at first temporarily left in the input-buffer 21.After certain data (such as needed data are handled in a despreading or a Multipath searching is handled needed data) all were filled with, these signals were transferred into despreading processing module 22.Despreading processing module 22 is based on reference clock signal with by control signal CTRLS2 (slot synchronization signal, frame synchronizing signal etc.) that cell search module 2 provided, carry out baseband receiving signals to (RSI by matched filter, RSD) with the private subscribers channel with spread symbol to (DSCI, DSCQ) related operation between.Then, as related operation result's despread signal to (ISI ISQ) is exported to pilot frequency mode demodulation module 23.
At pilot frequency mode demodulation module 23
1In, by complex multiplication operation device 41
1Carry out despread signal to (ISI is ISQ) with the conjugate complex number signal (DCPI of the pilot frequency mode modulation signal of described respective antenna A1
1, DCPQ
1) between complex multiplication and integral operation.Then, operation result (PLI
1, PLQ
1) be exported to coherence average arithmetic unit 24
1
On the other hand, at pilot frequency mode demodulation module 23
2In, by complex multiplication operation device 41
2Carry out despread signal to (ISI is ISQ) with the conjugate complex number signal (DCPI of the pilot frequency mode modulation signal of described respective antenna A2
2, DCPQ
2) between complex multiplication and integral operation.Then, operation result (PLI
2, PLQ
2) be exported to coherence average arithmetic unit 24
2
Coherence average arithmetic unit 24
1To signal to (PLI
1, PLQ
1) same phase constituent PLI
1With orthogonal component PLQ
1Carrying out respectively with the symbol is the coherence average computing of unit period.It is interval long generally can be set at several time slots during the average calculating operation.Such as, as shown in figure 11 be at continuous 4 time slot interval (Slot
K-2, Slot
K-1, Slot
K, Slot
K+1) in, to preceding two time slot (Slot
K-2, Slot
K-1) and latter two time slot (Slot
K, Slot
K+1) corresponding dedicated pilot signal piece (DPL
K-2, DPL
K-1) and (DPL
K, DPL
K+1) carry out respectively with the symbol be unit period respectively at phase constituent PLI
1With orthogonal component PLQ
1The coherence average computing.
On the other hand, the coherence average arithmetic unit 24
2To signal to (PLI
2, PLQ
2) same phase constituent PLI
2With orthogonal component PLQ
2Carrying out same as described above respectively is the coherence average computing of unit period with the symbol.
Coherence average arithmetic unit 24
1With coherence average arithmetic unit 24
2Operation result export to power averaging module 25 respectively
1With 25
2
In power averaging module 25
1, at first according to the same phase constituent IAI of each data sample of coherence average operation result
1With orthogonal component IAQ
1Calculate instantaneous power.Then, these instantaneous power data samples are averaged the average power of computing in the hope of received signal.Such as, as shown in figure 11,, try to achieve the average signal power in 4 time slot intervals at last based on the coherence average operation result.Resulting average signal power AVP
1From power averaging module 25
1Output is also stored the buffer memory 26 that power-delay is composed maker 26 into
1In.
On the other hand, identical with said process, in power averaging module 25
2, at first according to the same phase constituent IAI of each data sample of coherence average operation result
2With orthogonal component IAQ
2Calculate instantaneous power.Then, these instantaneous power data samples are averaged the average power of computing in the hope of received signal.Such as, as shown in figure 10,, try to achieve the average signal power in 4 time slot intervals at last based on the coherence average operation result.Resulting average signal power AVP
2From power averaging module 25
2Output is also stored the buffer memory 26 that power-delay is composed maker 26 into
2In.
The above processing procedure has generated the average signal power of a corresponding possible multipath composition sequential to (AVP
1, AVP
2).At each may multipath composition sequential repeat average signal power that above-mentioned processing procedure generates corresponding all possible multipath composition sequential to and be stored in the buffer memory 26 of power-delay spectrum maker 26 respectively by the temporal sequencing of each possible multipath composition sequential
1With 26
2In, then at buffer memory 26
1With 26
2In generated the power-delay spectrum PDF of the received signal of the corresponding first antenna A1 respectively
1Power-delay spectrum PDF with the received signal of the second antenna A2
2
Power-delay spectrum PDF based on above-mentioned generation
1And PDF
2, power-delay spectrum synthesis module carries out synthetic the processing with generation of power-delay spectrum and is used for the synthetic power-delay spectrum PDF that last multipath is selected, and sends MPU to by MPU bus or MPU interface.
MPU selects the average signal power sampling point above pre-set threshold from above-mentioned synthetic power-delay spectrum PDF, and selects the clock signal that finally is used for the synthetic effective multipath composition of RAKE according to relative size and their relative positions in synthetic power-delay spectrum PDF of these average signal power sampling points.Afterwards, MPU sends the clock signal of selected effective multipath composition to control channel receiving processing module 4 and subscriber channel receiving processing module 6.Like this, 6 of control channel receiving processing module 4 and subscriber channel receiving processing modules receive processing to above-mentioned effective multipath composition, and it is synthetic to carry out RAKE at last.
As previously discussed, at this example output signal is handled in despreading and composed processing such as synthetic and multipath selection with the pilot frequency mode signal of the corresponding first antenna A1 and the second antenna A2 through complex conjugate computing, coherence average, instantaneous signal power calculation, average signal power calculating, the generation of power-delay spectrum, power-delay respectively, in the W-CDMA system of employing transmitting antenna diversity technique, realize high-precision Multipath searching.Wherein the coherence average that carries out for the output signal after the pilot frequency mode demodulation process is handled, the power averaging processing can reduce effectively because the influence to the Multipath searching precision that noise and interference signal caused.
The mobile communication terminal 100 of this example, owing to possessed the Multipath searching module 3 that can in the W-CDMA system that adopts the transmitting antenna diversity technique, realize the high accuracy Multipath searching, result based on high-precision Multipath searching, carry out RAKE and receive processing, can realize high performance reception processing.
Further, in above-mentioned example, can only utilize a certain side among partial common frequency pilot sign piece PCB and the dedicated pilot symbol piece DPB to carry out Multipath searching, also can carry out Multipath searching in the time-multiplexed mode of utilizing a certain side earlier, switch to the opposing party then.And, if beginning all to be provided with simultaneously to power-delay spectrum generation module from despreading processing module 22 utilizes common pilot symbolic blocks CPB to carry out the buffer memory that Multipath searching uses and utilize dedicated pilot symbol piece DPB to carry out the buffer memory that Multipath searching is used, then utilize common pilot symbolic blocks CPB to carry out Multipath searching and utilize dedicated pilot symbol piece DPB to carry out Multipath searching and can carry out simultaneously.
Only utilize partial common frequency pilot sign piece PCB to carry out Multipath searching in the above-mentioned example, but go for utilizing whole common pilot symbolic blocks PCB to carry out Multipath searching too.Utilize whole dedicated pilot symbol piece DPB to carry out Multipath searching in the above-mentioned example, equally also go for utilizing the part of dedicated pilot symbol piece DPB to carry out Multipath searching.
In the above-mentioned example, utilize matched filter to carry out related operation in the despreading processing module, also can use a plurality of sliding correlation detectors to substitute matched filter and carry out related operation.
In the above-mentioned example, multipath is chosen among the MPU86 and realizes by software, also can realize with software in DSP87, also can realize with hardware module.
The 2nd example
The 2nd example of the present invention.The difference of the mobile communication terminal 100 of the 2nd example and the mobile communication terminal 100 of the 1st example only is the Multipath searching module, thus following serve as main describing just with the Multipath searching module.Wherein, will adopt same name with module or signal equal in the 1st example, and omit its detailed explanation.
With reference to the accompanying drawings 12, the Multipath searching module 3 of this example with identical in the 1st example, comprises with lower module: (a) with analog to digital converter output signal RSD (RDI, RDQ) the temporary transient input-buffer of preserving 21; (B) data RDI and the RDQ that two outputs of input-buffer 21 are exported carries out the despreading processing module 22 that despreading is handled respectively, and this module output is corresponding to despreading result ISI and the ISQ of RDI and RDQ; (C) the pilot frequency mode demodulation module 23, the pilot frequency mode of distributing to each antenna when this module utilizes known base station to send carries out complex conjugate multiplication to remove the pilot frequency mode modulation composition among ISI and the ISQ with the part of the corresponding pilot signal block of despreading result ISI and ISQ, and the output signal of corresponding two antennas is respectively PLI1, PLQ1 and PLI2, PLQ2; (D) the coherence average arithmetic unit 24 that respectively PLI1, PLQ1 and PLI2, PLQ2 is carried out the coherence average computing
1With 24
2, the coherence average computing is that unit carries out with the symbol; (E) to coherence average computing complex result (IAI
1, IAQ
1) and (IAI
2, IAQ
2) average the power averaging module 25 of power calculation
* 1With 25
* 2(F) power-delay spectrum maker module 26, comprise the average module 25 of storage power in this module
* 1With 25
* 2Output result's buffer memory 26
1With 26
2(G) power-delay spectrum synthesis module 27, the power-delay spectrum of each antenna that this module will generate is respectively synthesized processing, generates the synthetic power-delay spectrum of the unification of selecting in order to multipath.
Based on above-mentioned formation, Multipath searching module 3 under the control of MPU86 as described below mode carry out Multipath searching.Below Shuo Ming prerequisite is: the cell search process after (1) mobile communication terminal 100 power-on successfully finishes, and has determined the base station that is attached thereto; (2) Multipath searching module 3 has obtained the frame synchronization clock signal of described base station.
Below at first describe with regard to the action that utilizes partial common frequency pilot sign piece PCB to carry out Multipath searching processing Multipath searching module.
At first, with the same in the 1st example, MPU86 sends the SMC command signal by MPU interface 12 or MPU bus B 2 to despreading processing module 22 and pilot frequency mode demodulation module 23, indicates this two module to utilize partial common frequency pilot sign piece PCB to carry out Multipath searching and handles.According to the SMC command signal, MUX 32 select common pilot channel with spread symbol to (CSCI CSCQ) exports to matched filter 31; At pilot frequency mode demodulation module 23
1In, MUX 42
1Select the conjugate complex number signal (CCPI of the pilot frequency mode modulation signal of respective antenna A1
1, CCPQ
1) offer complex multiplication operation device 41
1At pilot frequency mode demodulation module 23
2In, MUX 42
2Select the conjugate complex number signal (CCPI of the pilot frequency mode modulation signal of respective antenna A2
2, CCPQ
2) offer complex multiplication operation device 41
2
When baseband receiving signals to (RSI, when RSD) being transfused to the Multipath searching processing module, these signals are at first temporarily left in the input-buffer 21.After certain data (such as needed data are handled in a despreading or a Multipath searching is handled needed data) all were filled with, these signals were transferred into despreading processing module 22.Despreading processing module 22 is based on reference clock signal with by control signal CTRLS2 (slot synchronization signal, frame synchronizing signal etc.) that cell search module 2 provided, carry out baseband receiving signals to (RSI by matched filter, RSD) with common pilot channel with spread symbol to (CSCI, CSCQ) related operation between.Then, as related operation result's despread signal to (ISI ISQ) is exported to pilot frequency mode demodulation module 23.
At pilot frequency mode demodulation module 23
1In, by complex multiplication operation device 41
1Carry out despread signal to (ISI is ISQ) with the conjugate complex number signal (CCPI of the pilot frequency mode modulation signal of described respective antenna A1
1, CCPQ
1) between complex multiplication and integral operation.Then, operation result (PLI
1, PLQ
1) be exported to power averaging module 25
* 1
On the other hand, at pilot frequency mode demodulation module 23
2In, by complex multiplication operation device 41
2Carry out despread signal to (ISI is ISQ) with the conjugate complex number signal (CCPI of the pilot frequency mode modulation signal of described respective antenna A2
2, CCPQ
2) between complex multiplication and integral operation.Then, operation result (PLI
2, PLQ
2) be exported to power averaging module 25
* 2
In power averaging module 25
* 1, at first according to the same phase constituent PLI of each data sample of pilot frequency mode demodulation operation result
1With orthogonal component PLQ
1Calculate instantaneous power.Then, these instantaneous power data samples are averaged the average power of computing in the hope of received signal.Such as, as shown in figure 13,, try to achieve the average signal power in 4 time slot intervals at last based on pilot frequency mode demodulation operation result.Resulting average signal power AVP
1From power averaging module 25
* 1Output is also stored the buffer memory 26 that power-delay is composed maker 26 into
1In.
On the other hand, identical with said process, in power averaging module 25
* 2, at first according to the same phase constituent PLI of each data sample of pilot frequency mode demodulation operation result
2With orthogonal component PLQ
2Calculate instantaneous power.Then, these instantaneous power data samples are averaged the average power of computing in the hope of received signal.Such as, as shown in figure 13,, try to achieve the average signal power in 4 time slot intervals at last based on pilot frequency mode demodulation operation result.Resulting average signal power AVP
2From power averaging module 25
* 2Output is also stored the buffer memory 26 that power-delay is composed maker 26 into
2In.
The above processing procedure has generated the average signal power of a corresponding possible multipath composition sequential to (AVP
1, AVP
2).At each may multipath composition sequential repeat average signal power that above-mentioned processing procedure generates corresponding all possible multipath composition sequential to and be stored in the buffer memory 26 of power-delay spectrum maker 26 respectively by the temporal sequencing of each possible multipath composition sequential
1With 26
2In, then at buffer memory 26
1With 26
2In generated the power-delay spectrum PDF of the received signal of the corresponding first antenna A1 respectively
1Power-delay spectrum PDF with the received signal of the second antenna A2
2
Power-delay spectrum PDF based on above-mentioned generation
1And PDF
2, power-delay spectrum synthesis module carries out synthetic the processing with generation of power-delay spectrum and is used for the synthetic power-delay spectrum PDF that last multipath is selected, and sends MPU to by MPU bus or MPU interface.
MPU selects the average signal power sampling point above pre-set threshold from above-mentioned synthetic power-delay spectrum PDF, and selects the clock signal that finally is used for the synthetic effective multipath composition of RAKE according to relative size and their relative positions in synthetic power-delay spectrum PDF of these average signal power sampling points.Afterwards, MPU sends the clock signal of selected effective multipath composition to control channel receiving processing module 4 and subscriber channel receiving processing module 6.Like this, 6 of control channel receiving processing module 4 and subscriber channel receiving processing modules receive processing to above-mentioned effective multipath composition, and it is synthetic to carry out RAKE at last.
Next describe with regard to the action that utilizes dedicated pilot symbol piece DPB to carry out Multipath searching processing Multipath searching module.
At first, MPU86 sends the SMC command signal by MPU interface 12 or MPU bus B 2 to despreading processing module 22 and pilot frequency mode demodulation module 23, indicates this two module to utilize dedicated pilot symbol piece PCB to carry out Multipath searching and handles.According to the SMC command signal, MUX 32 select common pilot channel with spread symbol to (DSCI DSCQ) exports to matched filter 31; At pilot frequency mode demodulation module 23
1In, MUX 42
1Select the conjugate complex number signal (DCPI of the pilot frequency mode modulation signal of respective antenna A1
1, DCPQ
1) offer complex multiplication operation device 41
1At pilot frequency mode demodulation module 23
2In, MUX 42
2Select the conjugate complex number signal (DCPI of the pilot frequency mode modulation signal of respective antenna A2
2, DCPQ
2) offer complex multiplication operation device 41
2
When baseband receiving signals to (RSI, when RSD) being transfused to the Multipath searching processing module, these signals are at first temporarily left in the input-buffer 21.After certain data (such as needed data are handled in a despreading or a Multipath searching is handled needed data) all were filled with, these signals were transferred into despreading processing module 22.Despreading processing module 22 is based on reference clock signal with by control signal CTRLS2 (slot synchronization signal, frame synchronizing signal etc.) that cell search module 2 provided, carry out baseband receiving signals to (RSI by matched filter, RSD) with the private subscribers channel with spread symbol to (DSCI, DSCQ) related operation between.Then, as related operation result's despread signal to (ISI ISQ) is exported to pilot frequency mode demodulation module 23.
At pilot frequency mode demodulation module 23
1In, by complex multiplication operation device 41
1Carry out despread signal to (ISI is ISQ) with the conjugate complex number signal (DCPI of the pilot frequency mode modulation signal of described respective antenna A1
1, DCPQ
1) between complex multiplication and integral operation.Then, operation result (PLI
1, PLQ
1) be exported to power averaging module 25
* 1
On the other hand, at pilot frequency mode demodulation module 23
2In, by complex multiplication operation device 41
2Carry out despread signal to (ISI is ISQ) with the conjugate complex number signal (DCPI of the pilot frequency mode modulation signal of described respective antenna A2
2, DCPQ
2) between complex multiplication and integral operation.Then, operation result (PLI
2, PLQ
2) be exported to power averaging module 25
* 2
In power averaging module 25
* 1, at first according to the same phase constituent IAI of each data sample of coherence average operation result
1With orthogonal component IAQ
1Calculate instantaneous power.Then, these instantaneous power data samples are averaged the average power of computing in the hope of received signal.Such as, as shown in figure 14,, try to achieve the average signal power in 4 time slot intervals at last based on pilot frequency mode demodulation operation result.Resulting average signal power AVP
1From power averaging module 25
* 1Output is also stored the buffer memory 26 that power-delay is composed maker 26 into
1In.
On the other hand, identical with said process, in power averaging module 25
2, at first according to the same phase constituent IAI of each data sample of coherence average operation result
2With orthogonal component IAQ
2Calculate instantaneous power.Then, these instantaneous power data samples are averaged the average power of computing in the hope of received signal.Such as, as shown in figure 14,, try to achieve the average signal power in 4 time slot intervals at last based on pilot frequency mode demodulation operation result.Resulting average signal power AVP
2From power averaging module 25
* 2Output is also stored the buffer memory 26 that power-delay is composed maker 26 into
2In.
The above processing procedure has generated the average signal power of a corresponding possible multipath composition sequential to (AVP
1, AVP
2).At each may multipath composition sequential repeat average signal power that above-mentioned processing procedure generates corresponding all possible multipath composition sequential to and be stored in the buffer memory 26 of power-delay spectrum maker 26 respectively by the temporal sequencing of each possible multipath composition sequential
1With 26
2In, then at buffer memory 26
1With 26
2In generated the power-delay spectrum PDF of the received signal of the corresponding first antenna A1 respectively
1Power-delay spectrum PDF with the received signal of the second antenna A2
2
Power-delay spectrum PDF based on above-mentioned generation
1And PDF
2, power-delay spectrum synthesis module carries out synthetic the processing with generation of power-delay spectrum and is used for the synthetic power-delay spectrum PDF that last multipath is selected, and sends MPU to by MPU bus or MPU interface.
MPU selects the average signal power sampling point above pre-set threshold from above-mentioned synthetic power-delay spectrum PDF, and selects the clock signal that finally is used for the synthetic effective multipath composition of RAKE according to relative size and their relative positions in synthetic power-delay spectrum PDF of these average signal power sampling points.Afterwards, MPU sends the clock signal of selected effective multipath composition to control channel receiving processing module 4 and subscriber channel receiving processing module 6.Like this, 6 of control channel receiving processing module 4 and subscriber channel receiving processing modules receive processing to above-mentioned effective multipath composition, and it is synthetic to carry out RAKE at last.
As previously discussed, at this example output signal is handled in despreading and composed processing such as synthetic and multipath selection with the pilot frequency mode signal of the corresponding first antenna A1 and the second antenna A2 through complex conjugate computing, instantaneous signal power calculation, average signal power calculating, the generation of power-delay spectrum, power-delay respectively, in the W-CDMA system of employing transmitting antenna diversity technique, realize high-precision Multipath searching.Wherein the power averaging that carries out for the output signal after the pilot frequency mode demodulation process is handled and can be reduced effectively because the influence to the Multipath searching precision that noise and interference signal caused.
The mobile communication terminal 100 of this example, owing to possessed the Multipath searching module 3 that can in the W-CDMA system that adopts the transmitting antenna diversity technique, realize the high accuracy Multipath searching, result based on high-precision Multipath searching, carry out RAKE and receive processing, can realize high performance reception processing.
Further, in above-mentioned example, can only utilize a certain side among partial common frequency pilot sign piece PCB and the dedicated pilot symbol piece DPB to carry out Multipath searching, also can carry out Multipath searching in the time-multiplexed mode of utilizing a certain side earlier, switch to the opposing party then.And, if beginning all to be provided with to power-delay spectrum generation module from despreading processing module 22 utilizes common pilot symbolic blocks CPB to carry out the buffer memory that Multipath searching uses and utilize dedicated pilot symbol piece DPB to carry out the buffer memory that Multipath searching is used, then utilize common pilot symbolic blocks CPB to carry out Multipath searching and utilize dedicated pilot symbol piece DPB to carry out Multipath searching and can carry out simultaneously.
Only utilize partial common frequency pilot sign piece PCB to carry out Multipath searching in the above-mentioned example, but go for utilizing whole common pilot symbolic blocks PCB to carry out Multipath searching too.Utilize whole dedicated pilot symbol piece DPB to carry out Multipath searching in the above-mentioned example, equally also go for utilizing the part of dedicated pilot symbol piece DPB to carry out Multipath searching.
In the above-mentioned example, utilize matched filter to carry out related operation in the despreading processing module, also can use a plurality of sliding correlation detectors to substitute matched filter and carry out related operation.
In the above-mentioned example, multipath is chosen among the MPU86 and realizes by software, also can realize with software in DSP87, also can realize with hardware module.
Claims (10)
1. multipath searching method, implement device and mobile communication terminal device that is applicable to the spread spectrum code division multiple access communication system that adopts the transmission antenna diversity technology is characterized in that:
1). multipath searching method is:
Employed spreading code and received signal are carried out the complex conjugate multiplication computing and are handled with the despreading that obtains despread signal during a. with known base station transmit signals;
B. with two kinds of mutually orthogonal pilot frequency mode signals respectively with despread signal in the pilot signal block that comprised in each time slot carry out the complex conjugate multiplication computing realizing the demodulation of pilot frequency mode signal, and separate the mediation signal separation process from the pilot frequency mode of the Signal Separation of two antennas;
C. generate the power-delay spectrum generation processing of the power-delay spectrum of corresponding two antennas respectively based on the signal after the above-mentioned separation;
D. the power-delay spectrum of above-mentioned corresponding two antennas is respectively synthesized and handle to generate synthetic processing of power-delay spectrum of synthetic power-delay spectrum;
E. the multipath that above-mentioned synthetic power-delay spectrum is carried out the selection of effective multipath composition is selected to handle;
2). multipath searching device by: despreading processing module, pilot frequency mode are separated and are in harmonious proportion signal separation process module, power-delay spectrum and generate processing module, the synthetic processing module of power-delay spectrum and multipath and select processing module to form;
3). mobile communication terminal device is by carrying out the Multipath searching module that Multipath searching handles based on the received signal that sends from the base station and handling resulting effective multipath composition clock signal based on Multipath searching the receiving processing module that the signal that sends from the base station receives processing is formed.
2. multipath searching method according to claim 1, it is characterized in that: described pilot signal patterns and corresponding pilot signal block, both can use the private subscribers pilot frequency mode that adopted in the private subscribers physical channel and the dedicated pilot signal piece that each time slot comprised of corresponding private subscribers physical channel or a part wherein, also can use a common pilot signal piece that common pilot pattern that common pilot channel adopted that a base station sends to all users and corresponding common pilot channel transmitted or a part wherein.
3. multipath searching method according to claim 1, it is characterized in that: in the present invention, described pilot signal patterns and corresponding pilot signal block, also can use above-mentioned two kinds of pilot signal patterns and corresponding frequency pilot sign piece simultaneously, in this occasion, the generation that utilizes above-mentioned two kinds of pilot signal patterns and corresponding pilot signal block to carry out the power-delay spectrum is handled to walk abreast simultaneously and is carried out, and also can divide the time serial to carry out.
4. according to claim 1 or 2 or 3 described multipath searching methods, it is characterized in that: described power-delay spectrum generates to handle and comprises following processing: the coherence average between the same phase constituent of the pilot signal block of (1) each aerial signal after to described separation and the corresponding sampled value that orthogonal component carries out the chip period in every interval in the certain hour interval respectively; (2) calculate instantaneous signal power by described coherence average value with phase constituent and orthogonal component; (3) described instantaneous signal power is carried out a regularly interior average computation average power signal; (4) corresponding each possible multipath composition sequential repeats the processing of (1)～(3), obtains the average signal power of corresponding each possible multipath composition sequential; The average signal power of these corresponding all possible multipath composition sequential and constitute power-delay spectrum.
5. according to the described multipath searching method of claim 1～3, it is characterized in that: described multipath is selected to handle and comprised following processing: (1) selects to be higher than the sampling point of threshold value from the synthetic spectrum of described delay; (2) according to the described chosen relative position of sampling point in the synthetic spectrum of described power-delay, and the zero-time of whole Multipath searching processing calculates the sequential corresponding to effective multipath signal of the described sampling point that respectively is selected.
6. multipath searching device according to claim 1 is characterized in that: described power-delay spectrum generates the power calculation processing module that each data sample that processing module also comprises the pilot frequency mode restituted signal after (1) is to described separation calculates instantaneous signal power; (2) described instantaneous signal power is averaged the power averaging processing module of processing in the hope of average signal power; (3) generate the power-delay spectrum generation processing module that power-delay is composed based on described average signal power.
7. mobile communication terminal device according to claim 1, it is characterized in that: described radio frequency receiving processor, by the received signal subcarrier synthesizer, frequency frequency mixer, QPSK quadrature demodulator and some amplifiers and the filter that carry out conversion constitutes to received signal.The radio frequency receiving processor is transformed into baseband signal RS with radio frequency receiving signal, and exports to baseband signal processor, and baseband signal RS complex signal is made of same phase constituent (I) RSI and orthogonal component (Q) RSQ.Described radio frequency sends processor 84, by the QPSK quadrature modulator, carry out the frequency mixer of conversion to sending signal frequency, send signal carrier synthesizer and some amplifiers and filter and constitute.Radio frequency sends processor 84 will be transformed into radio frequency transmit signal from the baseband signal TS of base band signal process portion 85 inputs according to control signal CS, DT etc. from 85 inputs of base band signal process portion, and export to antenna 81, baseband signal TS is a complex signal, is made of same phase constituent (I) TSI and orthogonal component (Q) TSQ.
8. mobile communication terminal device according to claim 1, it is characterized in that: mobile communication terminal device, also comprise and the consecutive microprocessor unit of baseband signal processor (MPU), digital signal processor unit (DSP), and coder/decoder (CODEC), described microprocessor unit MPU controls mobile communication terminal device integral body, input units such as keyboard are connected with MPU with output display devices such as LCDs, after the data of the user of mobile communication terminal device by input unit input are sent to MPU, MPU according to the type of input data with these data contents in display unit, or send data to baseband signal processor.
9. according to claim 1,7,8 described mobile communication terminal devices, it is characterized in that: described DSP is under MPU control, be responsible for the part digital signal relevant treatment of baseband signal processor, described CODEC is connected between baseband signal processor and loud speaker and the microphone, be responsible for coding, the decoding processing of speech signal, that is to say: convert analog voice signal from the digitized voice signal of baseband signal processor output to by CODEC, output to loud speaker then, transfer sound to; Convert audio digital signals to and offer baseband processor after handling by the CODEC sample code by the analog voice signal of microphone input.
10. according to claim 1,7,8,9 described mobile communication terminal devices, it is characterized in that: include in the described baseband signal processor: the analog signal RS by the output of radio frequency receiving signal processor is received analog to digital converter (A/D), cell search module (CSR), Multipath searching module (PSR), broadcast channel receiving processing module (BCHRR), the private subscribers channel receiving processing module (TCHRR) of processing and receives handle cache module (RBUF) etc. as lower module; Sending processing exports to the transmission processing buffer memory (TBUF) of the baseband signal TS of radio frequency transmit signal processor, sends band spectrum modulation processing (TR), transmission low pass shaping filter (RNF) and the controller (CTRL1) that baseband signal processor is controlled comprehensively, control module compositions such as (RFC) with generation.
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| CNA031159826A CN1642052A (en) | 2003-03-25 | 2003-03-25 | Multi-path searching method, device for realizing same and mobile communication terminal device |
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| CN101162916B (en) * | 2006-10-10 | 2011-06-15 | 中国科学院嘉兴无线传感网工程中心 | Energy computation and search multipath device of Rake receiver, Rake receiver using the device and method thereof |
| CN101207847B (en) * | 2006-12-19 | 2012-10-10 | 富士通株式会社 | Wireless communication connection destination selecting method and device |
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| WO2014075532A1 (en) * | 2012-11-14 | 2014-05-22 | Telefonaktiebolaget L M Ericsson (Publ) | Pilot signal transmission method, associated transmit-receive point, pilot signal reception method and associated user equipment |
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| CN101162916B (en) * | 2006-10-10 | 2011-06-15 | 中国科学院嘉兴无线传感网工程中心 | Energy computation and search multipath device of Rake receiver, Rake receiver using the device and method thereof |
| CN101207847B (en) * | 2006-12-19 | 2012-10-10 | 富士通株式会社 | Wireless communication connection destination selecting method and device |
| CN101425819B (en) * | 2007-10-31 | 2013-03-20 | 凌阳电通科技股份有限公司 | Timing Control Method and Device in Channel Estimation |
| CN103297106A (en) * | 2012-02-27 | 2013-09-11 | 华为技术有限公司 | Code division multiple access multiple-antenna open-loop diversity transmission method and base station |
| CN103297106B (en) * | 2012-02-27 | 2016-12-14 | 华为技术有限公司 | CDMA multiple antennas open loop diversity sending method and base station |
| WO2014075532A1 (en) * | 2012-11-14 | 2014-05-22 | Telefonaktiebolaget L M Ericsson (Publ) | Pilot signal transmission method, associated transmit-receive point, pilot signal reception method and associated user equipment |
| US9900132B2 (en) | 2012-11-14 | 2018-02-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Pilot signal transmission method, associated transmit-receive point, pilot signal reception method and associated user equipment |
| CN104053244A (en) * | 2013-03-12 | 2014-09-17 | 普天信息技术研究院有限公司 | A random access method |
| CN104053244B (en) * | 2013-03-12 | 2018-11-23 | 普天信息技术研究院有限公司 | A kind of accidental access method |
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