CN102111185A - Method and system for multi-user all-digital broadband wireless communication - Google Patents
Method and system for multi-user all-digital broadband wireless communication Download PDFInfo
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Abstract
本发明公开一种多用户全数字宽带无线通信的方法及系统，涉及宽带无线通信领域，本发明通过对数字基带信号进行编码及脉冲波形的整形处理后直接放大、发射以及接收来实现多用户全数字宽带无线通信，而不需要借助传统无线电模拟载波以及不需要对发射信号进行模拟载波调制。本发明系统发射端通过对数字基带信号进行扩展与同步的编码，并再经过整形后形成传输码，传输码经过放大后通过宽带天线发射；在本发明系统接收端被宽带天线接收到的信号，经过整形后，被低噪声放大器放大后输入到高速采样器，再输入到解码电路还原出原始数据信号。本系统具有结构简单、传输速率高、低成本、多用户共享信道实现信息同时传输的特点。
The invention discloses a method and system for multi-user all-digital broadband wireless communication, and relates to the field of broadband wireless communication. The invention realizes multi-user full-digital broadband wireless communication by directly amplifying, transmitting, and receiving digital baseband signals after encoding and shaping of pulse waveforms. Digital broadband wireless communication without the need for traditional radio analog carriers and without analog carrier modulation for transmitted signals. The transmitting end of the system of the present invention expands and encodes the digital baseband signal synchronously, and then forms a transmission code after shaping, and transmits the transmission code through the broadband antenna after being amplified; the signal received by the broadband antenna at the receiving end of the system of the present invention, After shaping, it is amplified by a low-noise amplifier and then input to a high-speed sampler, and then input to a decoding circuit to restore the original data signal. The system has the characteristics of simple structure, high transmission rate, low cost, and multi-user shared channel to realize simultaneous information transmission.
Description
Technical field
The present invention relates to a kind of multi-user's broadband wireless communication technique, particularly carry out transmitting under the situation of analog carrier modulation need and not needing, by digital baseband signal being encoded and shaping handles that the back is directly amplified, emission and receive and realize multi-user's full-digital broadband radio communication by the radio analog carrier.
Background technology
In traditional communication system, the digital signal of carrying information has characteristics such as signal amplitude is little, frequency is low usually, thereby radio communication need be modulated to digital signal on radio frequency (the radio frequencyRF signal) analog carrier signal usually, by transmitting and receiving of analog carrier signal being realized the signal transmission.
In order to realize multi-user communication, traditional method comprises the wavelength division multiplexing technology such as (wavelength divisionmultiplexing-WDM) in time division multiple access (time division multipleaccess-TDMA) technology and the optical fiber communication.In traditional radio communication, a kind of multi-user communication technology that is widely used is code division multiple access (code division multiple access-CDMA) technology, this technology can improve the effective rate of utilization of frequency spectrum, improves information transfer efficiency and reduces interference.
CDMA is based upon on the theoretical foundation of orthogonal coding, correlation reception, and the utilization spread spectrum solves multi-user's location problem of radio communication.Spread spectrum communication is meant will need data signals transmitted in the system, go modulate it with a bandwidth much larger than the pseudorandomcode signal of data signal bandwidth at transmitting terminal, make after the bandwidth expansion of former data-signal, pass through the modulation of radio-frequency carrier again, launch then.Receiving terminal in system, the radiofrequency signal that receives use with identical pseudo noise code of transmitting terminal and the broadband signal that receives and do relevant treatment through after the demodulation, and broadband signal is despread to original data signal.
CDMA technology utilizes big and the pseudo-random code sequence that cross correlation is little of autocorrelation as address code, and the broadband signal mutual superposition of different user in the channel is carried out wideband transmit after together.In above process, signal also will be superimposed with and disturb and noise signal.The local address code that produces of system's utilization reaches noise to the received signal and carries out demodulation, the relevant fully broadband signal of the every and local address code that produces will be reduced into narrow band signal (correlation demodulation), and other and the incoherent wideband interferer signal of local address sign indicating number and broadband noise still are broadband signal.Despread signal is behind narrow-band filtering, and signal to noise ratio is greatly improved, and required data signals transmitted can be separated.
Traditional analog carrier modulation technique is the main pattern of RI radio intelligence transmission always, and its principal character is to need analog carrier in the system, by data signal modulation being launched on the radio analog carrier signal and transmitting.Consider that from the circuit angle above system all needs frequency mixer.But along with popularizing of development of technology and radio communication, several main patterns such as pressing for a kind of wireless communications mode can the compatible with digital signal, computerized information and optical fiber communication, and have simple in structure, with low cost, superior performance, multi-user advantage such as communicate by letter simultaneously simultaneously.
Below, we will propose a kind of multi-user's full-digital broadband wireless communications method and system that is different from traditional mode on the characteristics basis of the multi-user wireless communication system of analysis conventional.
In traditional wireless communication system, radio-frequency receiving-transmitting subsystem (being called for short radio-frequency system or radio system) mainly is to adopt the analog carrier modulating mode that frequency is carried out conversion, and this pattern needs the radio analog carrier to realize wireless transmission of signal.The transmitting terminal of its receive-transmit system carries out mixing by frequency mixer with baseband signal and analog carrier signal, thereby the information that will need to transmit is loaded on the radiofrequency signal, launches by antenna then.At the receiving terminal of analog carrier modulating mode, radiofrequency signal that receives and analog carrier signal are carried out mixing, isolate baseband signal by filter then and give back level and handle.The typical implementation method of this receiving terminal comprise as, zero intermediate frequency reciver, dual IF heterodyne receiver etc.Please refer to " radio-frequency (RF) microelectronic ", Behzad Razavi work, Yu Zhiping, Zhou Runde translates, in April, 2006 front page (list of references 1).
In cdma system, transmitting terminal N road customer traffic b
1(t), b
2(t) ... .b
N(t) with separately pseudo noise code PN
1, PN
2... .PN
NMultiply each other and carry out spread processing, wherein pseudo noise code PN
iMust and b
i(t) synchronous.Each roadbed band signal behind the spread spectrum and analog radio frequency carrier wave carry out mixing and launch.
With the 1 tunnel user is example, at the receiving terminal of cdma system, has comprised this user's useful signal b in the signal of receiving
1(t) and other users' interference signal.Receiving terminal earlier carries out demodulation to the radio frequency analog carrier, the PN that the signal after the demodulation produces with this locality again
1Sign indicating number is (with the PN of transmitting terminal generation
1Sign indicating number is identical) multiply each other and carry out demodulation, can obtain original data message.Relevant patent comprises that as Application No. 07/991841, name is called " Despreading technique for CDMA systems " (referenced patent 1); Application No. 09/265204, name is called " CDMA signal transmission control " (referenced patent 2).
Learn that by above analysis traditional main flow wireless communication system all needs to rely on the analog carrier modulating mode, promptly communication system need rely on the modulation of digital baseband signal to the radio analog carrier, realizes information emission and transmission by analog carrier.For ultra broadband (ultra wideband-UWB) communication system of pulse wireless power mode, the transmitting terminal of system needs the modulation of pulse generator and digital baseband signal paired pulses, and realizes message transmission by transmitting and receiving pulse signal.Please refer to Ultra wideband:signalsand systems in communication engineering, M.Ghavami, L.B.Michael, R.Kohno, John Wiley ﹠amp; Sons Inc, 2007 (list of references 2).
Under traditional wireless communication technology pattern, the wireless transmission of computerized information and optical fiber information all needs to rely on the modulating mode of radio analog carrier (perhaps wireless pulse signal).Still do not have a kind of wireless communications method or system to be based upon digital baseband signal is carried out on the basis of Digital Signal Processing so far, realize multi-user's full-digital broadband wireless transmission of information.
Summary of the invention
The present invention is on the basis of the method and system pattern of the various traditional wireless communications of labor, proposes a kind of multi-user's full-digital broadband wireless communications method and system by digital baseband signal being carried out directly amplify, transmit and receive behind the Digital Signal Processing formation transmission code.
Compare with the wireless communications mode of present maturation, wireless communication system of the present invention does not have analog carrier, no pulse, do not need the modulation of analog carrier is handled yet, thus multi-user's full-digital broadband wireless communication system that implementation structure is simple, low cost, high transfer rate, compatibility are strong.
The present invention can realization and computer system and optical fiber telecommunications system between seamless wireless connections, and have the ability of the above wireless transmission rate of per second 1 gigabit.
In multi-user's full-digital broadband wireless communications method of the present invention, digital baseband signal is carried out Digital Signal Processing to be comprised digital baseband signal is encoded and the impulse waveform of digital signal is carried out shaping, by the transmission code that forms after coding and the shaping, after being had the amplification of certain bandwidth radio-frequency receive-transmit system process signal, directly transmit and receive.A core technology of the present invention is the low frequency component of eliminating by encoding in the digital signal, another one core technology of the present invention is to come higher harmonic components in the filtering digital signal by shaping, after the formation transmission code is had the amplification of certain bandwidth radio-frequency receive-transmit system process signal, directly transmit and receive, thus multi-user's full-digital broadband wireless transmission of realization digital signal.
Full-digital broadband wireless communication system of the present invention does not need to rely on the frequency mixer (perhaps pulse generator) in the legacy wireless communication system, and relevant modulation, thereby can reduce the complexity of system, reduce the cost of system simultaneously and improve the integrality of signal.The present invention will be the upgrading (comprising that the 5th generation reached technology later on) of the 4th generation (the fourthgeneration-4G) mobile communication technology, and a kind of possible solution of multi-user's full-digital broadband mobile communication is provided.
At the transmitting terminal of broadband wireless communication method of the present invention, digital baseband signal encoded is divided into expansion and synchronous two steps, be expanded successively sign indicating number and synchronous code, to the extended code after synchronously again through shaping formation transmission code.
We introduce the concrete grammar of among the present invention digital baseband signal being expanded respectively at low-speed digital baseband signal and two kinds of situations of high-speed figure baseband signal.
For the low-speed digital baseband signal, the described expansion of in the transmitting terminal described low-speed digital baseband signal being carried out comprises spread spectrum and separates two steps, described spread spectrum is that the combination of code element in the described low-speed digital baseband signal or code element is replaced the formation spreading code with the code element of high-speed digital signal or the combination of code element, the time step of described high-speed digital signal code element (time interval) is shorter than low-speed digital baseband signal, if in the high-speed digital signal spreading code that described low-speed digital baseband signal forms through described spread spectrum, there is the continuous single level of long sequence of some, then separate every the continuous single level of the long sequence of some, by described spread spectrum be separated to form extended code.
The low-speed digital baseband signal is carried out described spread spectrum, can be that code element or grouping of bits in the low-speed digital baseband signal replaced by a high-speed digital signal code element, also can be that low-speed digital baseband signal code element or grouping of bits are replaced by the combination of a plurality of high-speed digital signal code elements, can also be that low-speed digital baseband signal code element or grouping of bits are replaced by the pseudo random sequence of high-speed digital signal code element.
For the high-speed figure baseband signal,, then be separated to form extended code if detect above behind the continuous single level of the long sequence of some.
At transmitting terminal, realize by introducing separator carrying out described separation every the continuous single level of the long sequence of some in the high-speed digital signal spreading code behind high-speed figure baseband signal or the spread spectrum, it can be realized by the described separator of extra insertion behind the continuous single level of the long sequence of some, also can realize by one or more the continuous single level in the continuous single level of long sequence of replacing some with described separator.
The attribute that described separator has is different from the code element of described high-speed figure baseband signal, the code element that also is different from the high-speed digital signal spreading code that forms behind the described spread spectrum is separated described separator according to the difference of described attribute with the digital signal code element that is separated.The described different attribute that described separator had comprises different signal amplitudes, perhaps different time steps, perhaps different polarity, perhaps Yi Shang combination.To binary element 1 and 0, the high level of described separator is opposite with the high level polarity of the digital signal that is separated; Represent zero level when 0,1 represents high level, and when described separator was represented with-1, the high level that described separator has was opposite with the high level polarity of representing 1.
Be expanded behind the sign indicating number by above process, form synchronous code, guarantee that the signal after the expansion can correctly be reduced at receiving terminal by add synchronizing signal foremost in extended code.
To further carrying out shaping through the impulse waveform of the extended code signal after synchronous, promptly replace the broadband laser pulse waveform of extended code with the impulse waveform of narrow-band, form final transmission code.
In the described shaping process, when being used for replacing the narrow-band impulse waveform of described extended code broadband laser pulse waveform to meet anti-Qwest criterion (Nyquist signaling), extra intersymbol interference will not be introduced in described shaping.Be used for replacing the narrow-band impulse waveform of broadband laser pulse waveform (as square wave), according to anti-Qwest criterion, can with other pulse overlaps of front and back, but when need guaranteeing that a certain pulse reaches peak value, other pulses are 0 in the value of this point.By the signal of anti-Qwest that above method forms, the time domain width of having expanded pulse on the one hand reduces its frequency bandwidth, has avoided intersymbol interference on the other hand.The filtering of the target signal filter broadband frequency component that the above shaping receives by described extended code and receiving terminal antenna to transmitting terminal, as after utilizing raised cosine filter (raised cosine filter) to carry out filtering, can realize.
More than utilize coding (comprising expansion and synchronous) and shaping to form transmission code, low frequency component and high fdrequency component in the digital signal after having eliminated digital baseband signal or having passed through spread spectrum, the pairing spectral bandwidth of transmission code is within the bandwidth of radio-frequency system, utilization has certain bandwidth radio-frequency receive-transmit system and directly amplifies, emission and reception, can realize the full-digital broadband radio communication of digital signal, and not need analog carrier (comprising ultra-wideband pulse) in the legacy system and digital signal steps such as modulating/demodulating analog carrier signal.
At the receiving terminal of broadband wireless communication method of the present invention,, reduce original data signal by decoding at receiving terminal for the transmission code that forms through coding and shaping at transmitting terminal.
After receiving terminal detects separator in the transmitting terminal transmission code, decoding is that data-signal is reduced from described separator, if transmitting terminal is utilize to insert that separator is separated then by eliminating separator, if transmitting terminal is to utilize separator to replace one or more code element in the continuous single level of long sequence of some then replace described separator with described one or more code element, and reduce primary data information (pdi).
After forming described spreading code in the low-speed digital baseband signal of described transmitting terminal through spread spectrum, described decoding is to reduce original data signal at receiving terminal by despreading.
For the low-speed digital baseband signal, when being when carrying out spread spectrum at the low-speed digital baseband signal of different user by different pseudo random sequences at transmitting terminal, utilize and have the big and little characteristics of cross correlation of autocorrelation between the described pseudo random sequence, digital signal behind the spread spectrum is further carried out described separation, synchronous and shaping, form by the described described transmission code that has certain bandwidth radio-frequency receive-transmit system amplification, emission and receive; Sample through filtering, amplification and high-speed sampler at the signal that receiving terminal receives, continuation is reduced digital signal from described separator after, use described pseudo random sequence identical and the broadband signal that receives to do relevant treatment at different user with transmitting terminal, broadband signal is carried out despreading, thereby the original data signal of reduction different user is realized multi-user communication.
In the system of multi-user's full-digital broadband radio communication of the present invention, the transmitting terminal of this system of broadband wireless communication, by digital baseband signal being carried out described expansion and synchronous encoding process, carry out forming described transmission code after the shaping through described impulse waveform again to digital signal, described transmission code is transmitted into the space by broad-band antenna after amplifying through wideband power amplifer; The receiving terminal of this system of broadband wireless communication, the signal from broad-band antenna receives through after the shaping, amplifies through wideband low noise amplifier, is input to high-speed sampler, and then reduces each road user's original data signal by decoding circuit.
For the low-speed digital baseband signal, the emission end branch of this system of broadband wireless communication comprises: digital baseband signal generation systems, frequency expansion sequence generator, spectrum spreading circuit, add circuit, the continuous single level sensitive circuit of long sequence, separator generation and introducing circuit, circuit for generating synchronous signals, shaping circuit, wideband power amplifer, broad-band antenna; The receiving terminal of this system of broadband wireless communication partly comprises: broad-band antenna, shaping circuit, wideband low noise amplifier, high-speed sampler, separator detect and go back primary circuit, frequency expansion sequence de-spreading circuit.
For the high-speed figure baseband signal, the emission end branch of this system of broadband wireless communication comprises: digital baseband signal generation systems, the continuous single level sensitive circuit of long sequence, separator generation and introducing circuit, circuit for generating synchronous signals, shaping circuit, wideband power amplifer, broad-band antenna; The receiving terminal of this system of broadband wireless communication partly comprises: broad-band antenna, shaping circuit, wideband low noise amplifier, high-speed sampler, separator detect and go back primary circuit.
In system of the present invention, the problem of utilizing expansion to solve the pairing low frequency component of low speed digital signal or can't transmit in band-limited radio-frequency system near DC component has constituted a core technology of the present invention.To the coding of low-speed digital baseband signal at first is the combination of code element in the described low-speed digital baseband signal or code element to be replaced with the combination of the code element of high-speed digital signal or code element carry out spread spectrum and form spreading code, the time step of described high-speed digital signal code element is shorter than low-speed digital baseband signal, if in the high-speed digital signal spreading code that described low-speed digital baseband signal forms through described spread spectrum, there is the continuous single level of long sequence of some, then separate every the continuous single level of the long sequence of some, by described spread spectrum be separated to form extended code, add synchronizing signal again, finish the process of coding; For the high-speed figure baseband signal that comprises multi-user information,, the coding of growing the continuous single level signal of sequence is comprised that introducing separator separates and add synchronizing signal if contain the continuous single level of long sequence in the signal.
Through coding (comprising expansion and synchronous) high-speed digital signal afterwards is wide band impulse waveform (as square wave), has wherein comprised higher harmonic components.When wide band impulse waveform not being carried out shaping, the radio-frequency system that needs bandwidth to comprise the impulse waveform higher harmonic components could be correctly decoded and reduce original data signal at receiving terminal, if and the bandwidth of radio-frequency system only comprises the fundamental component of impulse waveform or than the harmonic component of low order, will produce intersymbol interference and cause distortion.
For avoiding signal cross-talk and to the excessive demand of radio-frequency system bandwidth, another one core technology of the present invention is to expansion and the wide band impulse waveform is synchronously carried out shaping and formed transmission code.A kind of method that realizes shaping is by wide band frequency component in the specific filter filtering impulse waveform, and can not cause intersymbol interference.
Above coding and shaping process do not need digital baseband signal is loaded on other the radio analog carrier or pulse signal, need not analog carrier is carried out launching/receiving after the modulating/demodulating yet.The radio frequency part of the transmitting terminal of native system need not up-conversion mixer and local oscillation signal, and the radio frequency part of the receiving terminal of native system also need not down-conversion mixer and local oscillation signal.By above system realized digital baseband signal through the coding and shaping after, the multi-user's full-digital broadband radio communication that directly transmits and receives.
The transmitting terminal structure of system of the present invention: carried the digital baseband signal that needs transmission information, its signal amplitude is usually in tens millivolts (mV) or following magnitude.By digital signal being expanded and synchronously and after shaping forms transmission code, directly the power amplifier by the broadband is amplified to hundreds of millivolts or above magnitude with the amplitude of transmission code, launches by broad-band antenna then.
The receiving terminal structure of system of the present invention: after broad-band antenna receives radio signal,, amplify by wideband low noise amplifier then, be input to the high-speed sampler sampling, obtain user's information separately by decoding at last by shaping.
The receiving terminal of this system of broadband wireless communication, for the digital signal of separating through separator, decoding is that data-signal is reduced from described separator, after forming described spreading code through spread spectrum in the low-speed digital baseband signal of described transmitting terminal, described decoding is to reduce original data signal at receiving terminal by despreading
By above analysis as can be known, system of the present invention be to each road number baseband signal encode with shaping after directly amplify through wideband power amplifer after, launch by broad-band antenna; Receiving terminal in system, radio signal through shaping, pass through wideband low noise amplifier and high-speed sampler after being received by broad-band antenna then, by decoding each road subscriber signal are reduced again.The present invention has avoided necessary device of demodulation structure such as frequency mixer in the traditional analog carrier communication pattern, and the pulse generator in the impulse radio ultra-wideband pattern, thereby implementation structure is simple, low-cost, multi-user's full-digital broadband wireless communication system of high transfer rate.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the system block diagram of corresponding low-speed digital baseband signal in the system of the present invention;
Fig. 2 is the system block diagram of corresponding high-speed figure baseband signal in the system of the present invention;
Fig. 3 is traditional direct upconversion transmitter structure (list of references 1);
Fig. 4 is traditional zero intermediate frequency reciver structure (list of references 1);
Fig. 5 is the block diagram of traditional typical CDMA receive-transmit system;
Fig. 6 is a low-speed digital baseband signal process pseudorandom m sequence spread spectrum, and adds the extended code that obtains successively after the synchronizing signal, the waveform of synchronous code;
Fig. 7 is that the high-speed figure baseband signal is expanded the extended code waveform that obtains by introducing separator (replacing original high level with negative level);
Fig. 8 be low speed digital signal through the pseudo random sequence spread spectrum and through back synchronously without the transmission situation of shaping in system, the bit rate of square-wave signal is 1Gbps behind the spread spectrum, the radio system maximum operating frequency is 1GHz, the distortion that exists intersymbol interference to cause to the simulation result display system of receiving code;
Fig. 9 be low speed digital signal through the pseudo random sequence spread spectrum and through back synchronously without the transmission situation of waveform transformation in system, the bit rate of square-wave signal is 1Gbps behind the spread spectrum, the radio system maximum operating frequency is 5GHz, the simulation result of receiving code is presented under the situation of higher harmonic components that the radio system bandwidth comprised square-wave signal can avoids distortion;
Figure 10 is that low speed digital signal is through the pseudo random sequence spread spectrum and through after synchronous, again through the transmission situation in system behind the shaping formation transmission code, the bit rate of square-wave signal is 1Gbps behind the spread spectrum, the radio system maximum operating frequency is 1GHz, simulation result to receiving code shows, after carrying out shaping through the filter of certain character rate, with comparing without shaping, but under same radio system bandwidth low distortion reduction original data signal;
Figure 11 is that the extended code that high-speed digital signal is introduced behind the separator forms the transmission situation in system behind the transmission code through waveform transformation, the bit rate of high-speed figure square-wave signal is 1Gbps, the radio system maximum operating frequency is 1GHz, simulation result to receiving code is presented at the introducing separator also through after the filter shaping of certain character rate, but low distortion reduction original data signal;
Have among above Fig. 1:
10-digital baseband signal generation systems (10
2Be the second tunnel user profile, 10
kBe k road user profile ...)
11-frequency expansion sequence generator (11
2Produce the frequency expansion sequence PN that first via user uses
2, 11
kProduce the frequency expansion sequence PN that the second tunnel user uses
k...)
The 12-spectrum spreading circuit
13-add circuit (multiple signals are at base station applies, corresponding one road signal of each portable terminal)
The continuous single level sensitive circuit of the long sequence of 131-
The 1311-separator produces and introduces circuit
The 14-circuit for generating synchronous signals
The 15-shaping circuit
16-transmitting terminal wideband power amplifer
17-transmitting terminal broad-band antenna
18-receiving terminal broad-band antenna
The 185-shaping circuit
19-receiving terminal wideband low noise amplifier
The 100-high-speed sampler
The 101-separator is primary circuit also
110-frequency expansion sequence de-spreading circuit
Have among Fig. 2:
20-digital baseband signal generation systems
The long sequence high-level detection of 21-
The 210-separator produces and introduces circuit
The 22-circuit for generating synchronous signals
The 23-shaping circuit
24-transmitting terminal wideband power amplifer
25-transmitting terminal broad-band antenna
26-receiving terminal broad-band antenna
The 265-shaping circuit
27-receiving terminal wideband low noise amplifier
The 28-high-speed sampler
The 29-separator is primary circuit also
Have among Fig. 3:
The 30-digital baseband signal
31-radio analog carrier
Signal after the 32-modulation frequency conversion
The 33-local oscillation signal
The 34-phase shifter
The 35-frequency mixer
Have among Fig. 4:
The 40-local oscillation signal
The 41-phase shifter
The 42-frequency mixer
Have among Fig. 5:
The 50-multiplier
The 51-pseudo-random sequence generator
The 52-adder
The 53-frequency mixer
54-receiving terminal low noise amplifier
The 55-frequency mixer
The 56-multiplier
The 57-pseudo-random sequence generator
The 58-integrator
Embodiment
Fig. 1 is the system block diagram of corresponding low-speed digital baseband signal in the system of the present invention.
The emission end branch comprises: digital baseband signal generation systems 10, frequency expansion sequence generator 11, spectrum spreading circuit 12, adder 13, the continuous single level sensitive circuit 131 of long sequence, separator produce and introduce circuit 1311, circuit for generating synchronous signals 14, shaping circuit 15, transmitting terminal wideband power amplifer 16, transmitting terminal broad-band antenna 7; Receiving terminal partly comprises: receiving terminal broad-band antenna 18, and shaping circuit 185, receiving terminal wideband low noise amplifier 19, high-speed sampler 100, separator be primary circuit 101 also, frequency expansion sequence de-spreading circuit 110.
In the transmitting terminal: carrying needs the low-speed digital of transmission information baseband signal with square-wave signal or other pulse signal form, be input to transmitting terminal, the bit rate of low-speed digital baseband signal is below hundreds of MBPS (Mbps), digital baseband signal generation systems 10, to need data signals transmitted to be input to system with square-wave signal or other pulse signal form, frequency expansion sequence generator 11 produces the frequency expansion sequence (as pseudo random sequence) of specific high-speed digital signal, finish spread spectrum by spectrum spreading circuit 12 to digital baseband signal 10, adder 13 during at base station applies each road user's signal plus (having only one road signal) for mobile phone users, the continuous single level sensitive circuit 131 of long sequence detects the low-speed digital baseband signal through behind the spread spectrum, if there is the continuous single level code element of continuous long sequence that surpasses some, separator produces and introduces 1311 pairs of spreading codes of circuit and is separated to form extended code, the synchronizing signal that circuit for generating synchronous signals 14 produces is added in the formation synchronous code foremost of extended code, synchronous code enters 15 pairs of signals of shaping circuit carries out filtering and eliminates higher harmonic components in the broadband signal, delivers to broad-band antenna 17 through the transmission code that forms after expansion and the shaping after through 16 amplifications of transmitting terminal wideband power amplifer and is transmitted into the space; In the receiving terminal: the signal that receives from broad-band antenna 18, after shaping circuit 185 shapings, amplified by wideband low noise amplifier 19, being input to high-speed sampler 100 samples, the signal that receives enter separator also primary circuit 101 reduce, signal after the reduction is decoded by de-spreading circuit 110, restores original data-signal.
Fig. 2 is the system block diagram of corresponding high-speed figure baseband signal in the system of the present invention.
The emission end branch comprises: digital baseband signal generation systems 20, and the continuous single level sensitive circuit 21 of long sequence, separator produce and introduce circuit 210, circuit for generating synchronous signals 22, shaping circuit 23, transmitting terminal wideband power amplifer 24, transmitting terminal broad-band antenna 25; Receiving terminal partly comprises: receiving terminal broad-band antenna 26, and shaping circuit 265, receiving terminal wideband low noise amplifier 27, high-speed sampler 28, separator be primary circuit 29 also.
In the transmitting terminal: carry need transmission information digital baseband signal with square-wave signal or other pulse signal form, be input to transmitting terminal, high-speed figure baseband signal bit rate itself just can reach gigabit (Gbps) or more than.Digital baseband signal generation systems 20 is transferred to the continuous single level sensitive circuit 21 of long sequence with the high-speed figure baseband signal, if the continuous single level sensitive circuit 21 of long sequence detects the single level code element of continuous long sequence above some, separator produces and introduces 210 pairs of signals of circuit and is separated to form extended code, the synchronizing signal that circuit for generating synchronous signals 22 produces adds the formation synchronous code foremost of extended code, the impulse waveform of 23 pairs of signals of shaping circuit is carried out the higher harmonic components in filtering elimination broadband (as the square wave) pulse signal, through forming transmission code after expansion and the shaping, deliver to transmitting terminal broad-band antenna 25 after transmission code amplifies through transmitting terminal wideband power amplifer 24 and be transmitted into the space.In the receiving terminal: the signal that receives from broad-band antenna 26, after at first passing through shaping circuit 265 shapings, amplified by wideband low noise amplifier 27, being input to high-speed sampler 28 again samples, the signal that receives further enter separator also primary circuit 101 reduce, restore original data-signal.
In the above whole system, the frequency response bandwidth of power amplifier, low noise amplifier and antenna need satisfy corresponding system bandwidth requirement.
Above-described multi-user's full-digital broadband wireless communication system has the function that realizes the wireless connections between the multiple-access computer.Simultaneously, because the transmission of information also is to adopt the digitlization pattern, native system also has with the directly compatible characteristic of optical fiber communication in optical fiber communication, thereby realizes the wireless connections between the optical fiber communication.In addition, the on-chip interconnect of integrated circuit (IC) chip (interconnect) also can realize that wireless is gone up interconnected by the native system pattern.
According to the system block diagram of Fig. 1, below introduce the multi-user communication of a kind of method the present invention realizes to(for) the low-speed digital baseband signal.
For the low-speed digital baseband signal, low speed digital signal is carried out a kind of method of spread spectrum, be thereby that the code element of each high level in the low-speed digital baseband signal is all replaced the sign indicating number that is expanded with the high-speed digital signal pseudo random sequence, this process has been eliminated the low frequency information in the low-speed digital baseband signal.Pseudo random sequence wherein has the big and little characteristics of cross correlation of autocorrelation, with different pseudo random sequences the digital baseband signal of different user is carried out spread spectrum, and utilizes identical pseudo noise code to carry out despreading at receiving terminal, can realize multi-user communication.For the pseudo random sequence behind the spread spectrum,, then further separate by introducing separator if detect above after the continuous single level code element of the long sequence of some.
Extended code by above process forms has realized multi-user communication on the one hand, has eliminated the low frequency component in the digital signal simultaneously.
Then, the impulse waveform of the extended code signal after passing through is synchronously further carried out shaping, thus the higher harmonic components in the filtering broadband laser pulse waveform.
Transmission code through above expansion and shaping formation, can be had certain bandwidth radio-frequency receive-transmit system directly amplifies, launches and receive, sample through shaping, amplification and high-speed sampler at the signal that receiving terminal receives, continuation is reduced data-signal from separator after, use described pseudo random sequence identical and the broadband signal that receives to do relevant treatment with transmitting terminal, broadband signal is despread to original data signal, can realize multi-user's full-digital broadband radio communication.
For the high-speed figure baseband signal, itself has comprised multi-user information, realizes the addressing of different user by time division multiple access (TimeDivision Multiple Access-TDMA).
Below, we handle the implementation method that forms transmission code in conjunction with in binary sequence specific explanations Fig. 1 of the present invention and Fig. 2 system to digital baseband signal.
As a rule, digital baseband signal normally adopts 0 and 1 expression of binary element, and for example, 0 represents low level (as the no-voltage of common employing), and 1 represents high level.
At the low-speed digital baseband signal, for realizing multi-user's spread spectrum, implementation example of the present invention is finished by pseudo random sequence, and wherein a kind of special case of pseudo random sequence is the m sequence, is the pseudo random sequence that is produced by particular register.Given m the hardware circuit that register is formed, can produce a set of symbols number is 2
m-1 m sequence, cross correlation is little between the wherein different m sequence (m1, m2, m3......), autocorrelation is big.The time span t of each code element in all m sequences
mFix.
Among the present invention digital baseband signal is handled the process that forms transmission code and is divided into following three steps:
First step is that digital baseband signal is expanded.
For the low-speed digital baseband signal, at first the frequency expansion sequence that the code element in the low-speed digital baseband signal is formed with the high level code element and the low level code element of high-speed digital signal is replaced.
Utilize high-speed digital signal to carry out a kind of method of spread spectrum, be thereby that the code element of each high level in the low-speed digital baseband signal is all replaced the sign indicating number that is expanded with pseudorandom m sequence, concrete implementation method is to multiply each other with the m sequence and the digital baseband signal that constantly circulate.Here time (2 of continuing of m sequence
m-1) * t
mEqual the duration of 1 code element of digital baseband signal.
The digital baseband signal of different user uses different m sequences to encode, just can transmit by shared same channel, and carry out relevant treatment to received signal in the pseudo random sequence that the receiving terminal utilization is identical with transmitting terminal, the data separation of different user can be come.Above expansion process has been widened frequency spectrum simultaneously, has improved channel capacity.Above process is by finishing in the frequency expansion sequence generator 11 of pseudo random sequence and the spectrum spreading circuit (mlultiplying circuit) 12.For high-speed digital signal spreading code through forming behind the pseudo random sequence spread spectrum, if detecting, testing circuit 131 contains the continuous single level of the too much long sequence of code element in the spreading code, then further eliminate its low frequency component by introducing separator, this step produces and introduces in the circuit 1311 and carry out at separator.
For the high-speed figure baseband signal, because its signal code check is very high, itself can carry multi-user information.In high-speed figure baseband signal or low-speed digital baseband signal the high-speed digital signal spreading code through spread spectrum formation, if contain the continuous single level of very long sequence, as continuous 1,000 1, pairing low frequency component may still exceed the lower limit of radio system bandwidth and can't transmit.For this situation, the present invention comes the continuous single level of long sequence is expanded by introducing separator.A kind of concrete implementation method is after detecting the continuous single sequence of levels of some P, then introduces separator the continuous single level separation of long sequence is become the single level of several short sequences, thereby be expanded sign indicating number.Above process has guaranteed not contain in the high-speed digital signal the continuous single level of long sequence, thereby eliminates the low frequency component in the high-speed digital signal.The separator of high-speed figure baseband signal is introduced in the separator generation and is introduced circuit 210 and carry out.
The introducing of separator can realize by following several method, a kind of method is to insert a separator after the continuous single level of the long sequence of some P, and another method is (or several) code element of replacing the continuous single level of long sequence of some P with separator.Separator has and original digital baseband signal code element and the different attribute of spreading code code element.For example, to binary element (1 and 0), represent zero level when 0,1 represents high level, and when separator was represented with-1, the high level that separator had was opposite with the high level polarity of representing 1.
Second step is that the digital baseband signal after the expansion is carried out promptly adding synchronizing signal on the basis of extended code synchronously.In order to guarantee that receiving terminal can identify the start element of a segment signal, need be in the adding synchronizing signal foremost of extended code, thus the synchronous code of obtaining.Must guarantee during practice that synchronizing signal can not appear at (the unique differentiation) in the signal.
The 3rd step is shaping.After handling through shaping, the synchronous code continuation that digital baseband signal forms through the expansion back obtains transmission code.The shaping process is the impulse waveform (as square wave) of replacing bandwidth with the narrow impulse waveform of frequency band, forms final transmission code.The narrow-band impulse waveform that is used for replacing the broadband laser pulse waveform is according to anti-Qwest criterion (Nyquist Signaling), can with other pulse overlaps of front and back, but when needing to guarantee that a certain pulse reaches peak value, other pulses are 0 in the value of this point.By above method, the time domain width of having expanded pulse on the one hand reduces its frequency bandwidth, has successfully avoided intersymbol interference on the other hand.The waveform that satisfies above-mentioned condition all is called as the signal of anti-Qwest the (Nyquist signal), and raised cosine (raised cosine) signal becomes the signal form that is most widely used because it reaches balanced preferably in every respect.And the implementation method of this kind signal is comparatively simple, adds raised cosine (raised cosine) filter and can realize above-mentioned shaping in system.The shaping of paired pulses waveform is to exceed under the situation that influences signal integrity and transmission performance the bandwidth that the reduction system is required.The processing to the original figure baseband signal has been finished in shaping and expansion, acting in conjunction synchronously.Transmission code after the shaping is compared with synchronous code and has been reduced the bandwidth of transmission signals at front end, thereby has reduced the bandwidth requirement of system to radio-frequency transmissions end and receiving terminal.
For the system of low-speed digital baseband signal, it is to carry out in shaping circuit 15 that the impulse waveform of digital signal is done shaping formation transmission code; For the system of high-speed figure baseband signal, it is to carry out in shaping circuit 23 that the paired pulses waveform is done shaping formation transmission code.
Fig. 3 is traditional direct upconversion transmitter structure.Wherein: digital signal 30 is loaded into analog carrier 31, radio signal 32 emissions after the formation modulation frequency conversion; Local oscillation signal 33 is adjusted by phase shifter 34, is loaded into radiofrequency signal by frequency mixer 35 again, after amplifying through power amplifier through the radiofrequency signal of mixing and modulation, launches by antenna.
Fig. 4 is traditional zero intermediate frequency reciver structure.Wherein: the radiofrequency signal that antenna receives is by behind the low noise amplifier, and local oscillation signal 40 is adjusted by phase shifter 41, by frequency mixer 42, is converted into low frequency signal, sends subsequent conditioning circuit again to and handles.
Fig. 5 is traditional typical CDMA transmitting-receiving structure.Wherein: each road subscriber signal multiplies each other by multiplier 50 and corresponding pseudo random sequence 51, and each road signal by after the adder 52, is sent into frequency mixer 53 and is loaded on the analog signal and launches.Receiving terminal receives to deliver to behind the signal in the low noise amplifier 54 and amplifies, and then enters 55 times mixing of frequency mixer, multiplies each other 56 with corresponding pseudo random sequence 57 again, obtains signal and delivers to integrator 58 and handle.
Fig. 1, Fig. 2 and Fig. 3, Fig. 4, Fig. 5 are compared the back discovery, traditional analog carrier modulating mode, its feature all is to need the radio analog carrier signal.And model proposed by the invention does not need other analog carrier.Especially, Fig. 1 and Fig. 4 are compared the back discovery, can realize the traditional C DMA technology of multi-user communication function, still need to utilize signal to modulate analog carrier by frequency mixer and realize wireless transmission, receiving terminal also needs frequency mixer to demodulate each road signal.
In order to prove feasibility of the present invention, we carry out technical identification to system configuration proposed by the invention and function.The frequency expansion sequence that proof procedure adopted is a pseudo random sequence.
Core technology thought of the present invention mainly comprises:
First aspect, utilize high-speed digital signal such as high speed pseudo random sequence that the low-speed digital baseband signal is carried out spread spectrum, guaranteed the not free long formed low frequency information of high level of step-length in the digital signal, utilize the big and little characteristics of cross correlation of pseudo random sequence autocorrelation simultaneously, different users uses different pseudo random sequences to encode just can to transmit in same channel, and reduces user's primary data information (pdi) separately at receiving terminal by decoding.
Encoding to high-speed digital signal by introducing separator in second aspect, has guaranteed not have in the digital signal the continuous single level of long sequence (or time step is long).
The higher harmonic components of filtering by impulse waveform (as square wave) in spread spectrum and the extended code digital signal that is separated to form come by shaping in the 3rd aspect.
Below, we verify above step in conjunction with a concrete system.
Transmitting terminal in system, at first the low-speed digital baseband signal is carried out spread spectrum by pseudo random sequence and form spreading code, form extended code through separating the back then, after the extended code front end adds synchronizing signal, further the paired pulses waveform carries out shaping and forms transmission code, utilize a wideband power amplifer that the signal of transmission code is amplified, the signal after the amplification is transmitted into the space by broad-band antenna.The antenna that receiving terminal in system, the signal that sends from transmitting terminal are received end after through the space transmission attenuation receives, and after shaping, is amplified by wideband low noise amplifier.Signal after the amplification obtains user's information separately by decoding after sampling through high-speed sampler again.
For the transmitting terminal of system, we at first consider how to realize multi-user shared channel communication.For the high-speed figure baseband signal,, can directly the different user signal be used different time period emissions by time division multiple access because its code check is enough high.Then can utilize the autocorrelation of m sequence big and the little characteristics of cross correlation are encoded the signal of different user with different m sequences for the low-speed digital baseband signal, can realize multi-user communication at different user with corresponding m sequential decoding at receiving terminal.
In digital baseband signal, the single high level of the continuous single level of long sequence or long-time step-length, corresponding low frequency information can't directly be launched as radio signal and transmit.
For the low-speed digital baseband signal, the sequence of utilizing the high-speed digital signal code element to form is carried out spread spectrum, thereby eliminates the low frequency component of low speed signal.Through the high-speed digital signal that forms behind the spread spectrum, if there is the continuous single level of long sequence, then, eliminate the pairing low frequency component of the single level of long sequence in the high speed signal by introducing separator further is separated to form short sequence to signal continuous single level.
For the high-speed figure baseband signal, eliminate the pairing low frequency component of continuous single level of long sequence by introducing separator.
Next we consider the formation and the transmitting-receiving situation of extended code.In Fig. 6-Figure 11, axis of ordinates is a time domain plethysmographic signal, and the unit of voltage is mV, and axis of abscissas is the time, and unit is nanosecond (ns).
After Fig. 6 is low-speed digital baseband signal process high-speed digital signal pseudorandom m sequence extension, the extended code of formation and synchronous code waveform.
Fig. 7 is the single level (high level) that has long sequence in the high-speed figure baseband signal, separates extended code and the synchronous code waveform that the back forms through separator.
Fig. 8-Figure 11 shows extended code without the shaping of impulse waveform and through after the shaping, the simulation curve of receiving code when transmitting in certain bandwidth radio-frequency system.
At the extended code that forms behind the low-speed digital baseband signal spread spectrum (bit rate is 1Gbps), be in the radio-frequency system (abbreviation radio system) of 1GHz in maximum operating frequency, system is at the simulation result of the receiving code of receiving terminal as shown in Figure 8.For the extended code of not carrying out shaping, because the higher harmonic components in the transmission course in the square-wave signal is by the filtering of certain bandwidth radio-frequency system, under this bandwidth radio-frequency system, will produce serious intersymbol interference and cause wave distortion, thereby cause after receiving terminal is sampled recovery to received signal, error code will occurring at some point.
And for fear of the error code that above this intersymbol interference causes occurring, a kind of method is the bandwidth of raising radio system, comprises the amplifier of amplifier, antenna and the receiving terminal of transmitting terminal.For example, when we brought up to 5GHz to the maximum operating frequency of radio system, the simulation result of receiving code as shown in Figure 9.Because the bandwidth of radio system increases, at this moment received signal has comprised required higher harmonic components basically, has eliminated the distortion that intersymbol interference causes.
Above presentation of results forms the extended code of an approximate random sequence for coding back, can realize that the no error code of data-signal transmits by the bandwidth of radio system (comprising transmitting terminal, antenna, receiving terminal) being brought up to when enough high.
But along with the increase of radio system bandwidth, the complexity of system and cost are also corresponding to increase considerably.Another one important technology thought of the present invention, be that the impulse waveform of digital signal is carried out shaping, wide band impulse waveform (as square wave) forms transmission code in the digital signal of the impulse waveform replacement extended code that dedicated bandwidth is narrower, thereby reduces the needed bandwidth of radio system.
Among the present invention extended code being carried out the function that shaping forms transmission code realizes by add raised cosine filter (raised cosine filter) in system.Have the raised cosine filter of certain character rate by introducing, extended code is carried out transmitting after filtering forms transmission code again.
For example, be the digital signal of 1Gbps for bit rate, carry out formed transmission code after the filtering by the raised cosine filter that satisfies anti-Qwest criterion, maximum operating frequency be the signal simulation result transmitted in the radio system of 1GHz as shown in figure 10.Result with not process raised cosine filter processing (Fig. 8) compares the back discovery, and raised cosine filter compresses the extended code frequency band under the situation that does not produce intersymbol interference, has reduced the required bandwidth of system.Thereby, shaping by paired pulses waveform of the present invention, the low error rate transmission that originally needs the radio system of high bandwidth just can realize very, comprise in the bandwidth of radio system under the situation of fundamental component (perhaps than the low-order harmonic component) of impulse waveform and just can realize.By reducing the bandwidth of radio system, can reduce the complexity and the cost of system greatly.
Among Figure 11, for bit rate is the high-speed digital signal of 1Gbps, eliminate the extended code that the continuous high level of long sequence forms in the primary signal by introducing separator, through after the shaping, in maximum operating frequency is in the radio system of 1GHz, can correctly reduce original data signal at receiving terminal by decoding.
In addition, consider the difference of the signal of different frequency, by shaping waveform is carried out conversion and form the bandwidth that transmission code reduces radio system,, having more advantage aspect the reduction error rate than simple increase system bandwidth in the space attenuation degree.
Above-described embodiment only is technological thought and the characteristics for explanation patent of the present invention; and can not with qualification claim of the present invention; every equalization of doing according to the thought that patent of the present invention disclosed changes or modifies, and must be encompassed in the protection range of this patent claims.
Claims (23)
1. multi-user's full-digital broadband method of wireless communication is characterized in that:
This broadband wireless communication method is by after digital baseband signal being carried out Digital Signal Processing formation transmission code, directly amplifies, transmits and receives, and realizes multi-user's full-digital broadband wireless transmission of information.
2. a kind of multi-user's full-digital broadband method of wireless communication according to claim 1 is characterized in that:
(1) in this broadband wireless communication method, described digital baseband signal is carried out described Digital Signal Processing comprise to encoding digital signals and to the impulse waveform of digital signal and carry out shaping;
(2) digital baseband signal is carried out described coding and shaping after, the described transmission code of formation is had after certain bandwidth radio-frequency receive-transmit system amplifies through signal, directly transmits and receives.
3. a kind of multi-user's full-digital broadband method of wireless communication according to claim 2 is characterized in that:
The transmitting terminal of this broadband wireless communication method carries out described coding to digital baseband signal and is divided into expansion and synchronous two steps, and be expanded successively sign indicating number and synchronous code are passed through described shaping again to described extended code after synchronously and formed described transmission code.
4. a kind of multi-user's full-digital broadband method of wireless communication according to claim 3 is characterized in that:
For the low-speed digital baseband signal, the described expansion of in the transmitting terminal described low-speed digital baseband signal being carried out comprises spread spectrum and separates two steps, described spread spectrum is the combination of code element in the described low-speed digital baseband signal or code element is replaced with the combination of the code element of high-speed digital signal or code element and to form spreading code, the time step of described high-speed digital signal code element is shorter than low-speed digital baseband signal, if in the high-speed digital signal spreading code that described low-speed digital baseband signal forms through described spread spectrum, there is the continuous single level of long sequence of some, then carry out described separation every the continuous single level of the long sequence of some, by described spread spectrum be separated to form extended code.
5. a kind of multi-user's full-digital broadband method of wireless communication according to claim 4 is characterized in that:
The low-speed digital baseband signal is carried out described spread spectrum, can be that code element or grouping of bits in the low-speed digital baseband signal replaced by a high-speed digital signal code element, also can be that low-speed digital baseband signal code element or grouping of bits are replaced by the combination of a plurality of high-speed digital signal code elements, can also be that low-speed digital baseband signal code element or grouping of bits are replaced by the pseudo random sequence of high-speed digital signal code element.
6. a kind of multi-user's full-digital broadband method of wireless communication according to claim 3 is characterized in that:
For the high-speed figure baseband signal, in the described high-speed figure baseband signal of transmitting terminal, then separate every the continuous single level of the long sequence of some, form described extended code.
7. according to claim 4 or 6 described a kind of multi-user's full-digital broadband method of wireless communication, it is characterized in that:
The transmitting terminal of this broadband wireless communication method, in described transmitting terminal, realize by introducing separator carry out described separation every the continuous single level of the long sequence of some, it can be realized by the described separator of extra insertion behind the continuous single level of the long sequence of some, also can realize by one or more the continuous single level in the continuous single level of long sequence of replacing some with described separator.
8. a kind of multi-user's full-digital broadband method of wireless communication according to claim 7 is characterized in that:
The attribute that described separator has is different from the code element of described high-speed figure baseband signal, the code element that also is different from the high-speed digital signal spreading code that forms behind the described spread spectrum is separated described separator according to the difference of described attribute with the digital signal code element that is separated.
9. a kind of multi-user's full-digital broadband method of wireless communication according to claim 8 is characterized in that:
The code element different attribute of the high-speed digital signal spreading code that forms behind that described separator had and the code element high-speed figure baseband signal and the spread spectrum comprises different signal amplitudes, perhaps different time steps, perhaps different polarity.
10. a kind of multi-user's full-digital broadband method of wireless communication according to claim 9 is characterized in that:
To binary element 1 and 0, the high level of described separator is opposite with the high level polarity of the digital signal that is separated; Represent zero level when 0,1 represents high level, and when described separator was represented with-1, the high level that described separator has was opposite with the high level polarity of 1 representative.
11. a kind of multi-user's full-digital broadband method of wireless communication according to claim 3 is characterized in that:
The transmitting terminal of this broadband wireless communication method, described synchronous code add synchronizing signal foremost in described extended code and form, and guarantee that the signal after the expansion is correctly reduced at receiving terminal.
12. a kind of multi-user's full-digital broadband method of wireless communication according to claim 3 is characterized in that:
The transmitting terminal of this broadband wireless communication method, described transmission code are that the shaping that the described extended code after is synchronously further carried out described impulse waveform is formed, and described shaping is the wide band impulse waveform that replaces described extended code with the impulse waveform of narrow-band.
13. a kind of multi-user's full-digital broadband method of wireless communication according to claim 12 is characterized in that:
In the described shaping process, be used for replacing the narrow-band impulse waveform of described extended code broadband laser pulse waveform to meet anti-Qwest criterion (Nyquist signaling), make described shaping not introduce extra intersymbol interference.
14. a kind of multi-user's full-digital broadband method of wireless communication according to claim 13 is characterized in that:
Described shaping is in described broadband wireless communication method, the filtering of the target signal filter broadband frequency component that described extended code and receiving terminal antenna are received and realizing.
15. a kind of multi-user's full-digital broadband method of wireless communication according to claim 14 is characterized in that:
Described filtering is to realize by raised cosine filter (raised cosine filter), forms raised cosine singal after the filtering.
16. a kind of multi-user's full-digital broadband method of wireless communication according to claim 2 is characterized in that:
At the described transmission code that the transmitting terminal of described broadband wireless communication method forms through described expansion and shaping, pairing spectral bandwidth is within the bandwidth of radio-frequency system, is had described bandwidth radio-frequency receive-transmit system and amplifies, transmits and receives.
17. a kind of multi-user's full-digital broadband method of wireless communication according to claim 2 is characterized in that:
The receiving terminal of this broadband wireless communication method for the described transmission code that forms through described coding and shaping at transmitting terminal, reduces original data signal at receiving terminal by decoding.
18. a kind of multi-user's full-digital broadband method of wireless communication according to claim 17 is characterized in that:
The receiving terminal of this broadband wireless communication method, detect described transmitting terminal forms described separator in the transmission code through described coding after at receiving terminal, described decoding is that data-signal is reduced from described separator, if described transmitting terminal is to utilize the described separator of insertion to separate then pass through to eliminate described separator, if one or more code element of utilizing described separator to replace in the continuous single level of long sequence of some is then replaced described separator with described one or more code element.
19. a kind of multi-user's full-digital broadband method of wireless communication according to claim 17 is characterized in that:
The receiving terminal of this broadband wireless communication method, in the low-speed digital baseband signal of described transmitting terminal through behind the spread spectrum of described coding, described decoding is to reduce original data signal at receiving terminal by despreading.
20. a kind of multi-user's full-digital broadband method of wireless communication according to claim 5 is characterized in that:
For the low-speed digital baseband signal, carry out described spread spectrum at the low-speed digital baseband signal of different user by different described pseudo random sequences at transmitting terminal, have the big and little characteristics of cross correlation of autocorrelation between the described pseudo random sequence, then the digital signal behind the spread spectrum is further carried out described separation, synchronously and shaping, formation is had certain bandwidth radio-frequency receive-transmit system and amplifies by described, emission and the described transmission code that receives, the signal that receives at receiving terminal passes through filtering, amplify and the high-speed sampler sampling, continuation is reduced digital signal from described separator after, at different user, use described pseudo random sequence identical and the broadband signal that receives to do relevant treatment with transmitting terminal, broadband signal is carried out despreading, thereby the original data signal of reduction different user is realized multi-user communication.
21. the system of multi-user's full-digital broadband radio communication is characterized in that:
The transmitting terminal of this system of broadband wireless communication, by digital baseband signal being carried out described expansion and synchronous encoding process, and the described impulse waveform to digital signal of process carries out forming described transmission code after the shaping, described transmission code is transmitted into the space by broad-band antenna after amplifying through wideband power amplifer; The receiving terminal of this system of broadband wireless communication, the signal from broad-band antenna receives through after the shaping, amplifies through wideband low noise amplifier, is input to high-speed sampler, and then reduces each road user's original data signal by decoding circuit.
22. the system of a kind of multi-user's full-digital broadband radio communication according to claim 21 is characterized in that:
For the low-speed digital baseband signal, the emission end branch of this system of broadband wireless communication comprises: digital baseband signal generation systems, frequency expansion sequence generator, spectrum spreading circuit, add circuit, the continuous single level sensitive circuit of long sequence, separator generation and introducing circuit, circuit for generating synchronous signals, shaping circuit, wideband power amplifer, broad-band antenna; The receiving terminal of this system of broadband wireless communication partly comprises: broad-band antenna, shaping circuit, wideband low noise amplifier, high-speed sampler, separator detect and go back primary circuit, frequency expansion sequence de-spreading circuit.
23. the system of a kind of multi-user's full-digital broadband radio communication according to claim 21 is characterized in that:
For the high-speed figure baseband signal, the emission end branch of this system of broadband wireless communication comprises: digital baseband signal generation systems, the continuous single level sensitive circuit of long sequence, separator generation and introducing circuit, circuit for generating synchronous signals, shaping circuit, wideband power amplifer, broad-band antenna; The receiving terminal of this system of broadband wireless communication partly comprises: broad-band antenna, shaping circuit, wideband low noise amplifier, high-speed sampler, separator detect and go back primary circuit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130602A (en) * | 2016-08-20 | 2016-11-16 | 华南理工大学 | A kind of CDMA coded method based on visible ray indoor positioning |
| CN107332605A (en) * | 2017-06-22 | 2017-11-07 | 山东航天电子技术研究所 | A kind of investigating method that integrated TT＆C system is relayed based on Ka S frequency ranges |
| CN108540167A (en) * | 2018-04-20 | 2018-09-14 | 璧电窘 | A kind of spectral shaping method based on spread spectrum shaping code |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050249264A1 (en) * | 2003-02-05 | 2005-11-10 | Nippon Telegraph And Telephone Corpoation | Wireless communication system, wireless transmitter, wireless receiver, wireless communication method, wireless transmission method and wireless reception method |
| US20080188186A1 (en) * | 2007-02-05 | 2008-08-07 | Samsung Electronics Co., Ltd. | Apparatus and method for transmitting channel sounding signal in wireless communication system |
| CN101599773A (en) * | 2009-06-05 | 2009-12-09 | 东南大学 | Broadband Wireless Communication Method Based on Direct Amplification and Transmission of Digital Signal |
| CN102387102A (en) * | 2010-08-27 | 2012-03-21 | 爱斯泰克（上海）高频通讯技术有限公司 | Digital signal coding-based method and system for 5th generation (5G) broadband wireless communication |
-
2010
- 2010-12-23 CN CN2010106076877A patent/CN102111185A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050249264A1 (en) * | 2003-02-05 | 2005-11-10 | Nippon Telegraph And Telephone Corpoation | Wireless communication system, wireless transmitter, wireless receiver, wireless communication method, wireless transmission method and wireless reception method |
| US20080188186A1 (en) * | 2007-02-05 | 2008-08-07 | Samsung Electronics Co., Ltd. | Apparatus and method for transmitting channel sounding signal in wireless communication system |
| CN101599773A (en) * | 2009-06-05 | 2009-12-09 | 东南大学 | Broadband Wireless Communication Method Based on Direct Amplification and Transmission of Digital Signal |
| CN102387102A (en) * | 2010-08-27 | 2012-03-21 | 爱斯泰克（上海）高频通讯技术有限公司 | Digital signal coding-based method and system for 5th generation (5G) broadband wireless communication |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130602A (en) * | 2016-08-20 | 2016-11-16 | 华南理工大学 | A kind of CDMA coded method based on visible ray indoor positioning |
| CN106130602B (en) * | 2016-08-20 | 2019-10-18 | 华南理工大学 | A CDMA Coding Method Based on Visible Light Indoor Positioning |
| CN107332605A (en) * | 2017-06-22 | 2017-11-07 | 山东航天电子技术研究所 | A kind of investigating method that integrated TT＆C system is relayed based on Ka S frequency ranges |
| CN108540167A (en) * | 2018-04-20 | 2018-09-14 | 璧电窘 | A kind of spectral shaping method based on spread spectrum shaping code |
| CN108540167B (en) * | 2018-04-20 | 2019-09-27 | 赵羽 | A Spectrum Shaping Method Based on Spreading Shaping Code |
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Application publication date: 20110629 |