CN1505294A - Multi-user receiving device for uplink dedicated physical channel in WCDMA system - Google Patents

Abstract

The invention provides a multi-user receiving device for an uplink dedicated physical channel in a wideband code division multiple access (WCDMA) system, and the device relates to the multi-user detection technology of a base station in a WCDMA cellular mobile communication system. Multi-user detection technology is an enhanced technology of Code Division Multiple Access (CDMA) system. Using double-layer weighted parallel interference cancellation method and its simplified method can greatly improve the performance of traditional parallel interference cancellation method. The invention applies the simplification method of double-layer weighted parallel interference cancellation method to the signal reception of the uplink dedicated physical channel, which can greatly improve the receiving performance of the uplink dedicated physical channel.

Description

Multi-user receiving device for uplink dedicated physical channel in WCDMA system

Technical field

The invention relates to a communication system, in particular to a multi-user detection technology of a base station in a wideband code division multiple access (WCDMA) cellular mobile communication system.

Background technique

The agreement of 3GPP brings together a complete set of standards of WCDMA system. According to the 3GPP protocol, the information bits of the dedicated physical data channel (DPDCH) in the uplink dedicated physical channel are channel-coded first, and then binary phase-shift keying (BPSK) mapping and spectrum spreading are performed. The information bits of the dedicated physical control channel (DPCCH) are directly mapped and spread by BPSK. The spread-spectrum DPDCH channel chip and DPCCH channel chip constitute I and Q two-way data, which are scrambled together. The scrambled I and Q chips are respectively pulse-shaped, and then sent to the base station through carrier modulation. In the 25.104, 25.944 and 25.212 protocols of 3GPP, the channel coding scheme of the DPDCH channel in the uplink dedicated physical channel is stipulated. See the 25.213 protocol of 3GPP for the spreading, scrambling, pulse shaping and modulation methods of the uplink dedicated physical channel.

The above is the process of the user end (UE) sending bits on the uplink dedicated physical channel in the WCDMA system. The base station of the WCDMA system receives the bits sent by the UE on the uplink dedicated physical channel according to the following process:

What Fig. 1 shows is the single-use RAKE receiver of the uplink dedicated physical channel. As shown in Figure 1, firstly, the received signal of the antenna is demodulated and matched and filtered to obtain the baseband signal; multipath search is performed on the baseband signal to obtain multipath time delay information. The baseband signal and multipath delay information enter the DPDCH processing channel and the DPCCH processing channel at the same time. The DPCCH processing channel performs DPCCH despreading, channel estimation and RAKE combination on the baseband signal according to the multipath delay information, and sends the DPCCH RAKE combination result to the TFCI decoding unit 101 and the DPCCH hard decision unit 102 . The TFCI decoding unit 101 decodes the RAKE combination result of the DPCCH to obtain the spreading factor of the DPDCH, and sends the spreading factor to the DPDCH despreading unit 104 . The DPCCH hard decision unit 102 performs a hard decision on the RAKE combination result of the DPCCH to obtain information bits of the DPCCH channel.

The DPDCH processing channel performs DPDCH despreading and DPDCH RAKE combining on the baseband signal according to the multipath delay information and the DPDCH spreading factor, and sends the RAKE combining result of the DPDCH channel to the decoder 103 for decoding. The decoder 103 decodes the RAKE combination result of the DPDCH to obtain information bits of the DPDCH channel. The decoding of DPDCH channel is the inverse process of DPDCH channel coding. This is the RAKE reception process of the uplink dedicated physical channel information bits in the WCDMA system.

A WCDMA system is an interference limited system. Multiple access interference limits the further improvement of WCDMA system capacity. The performance of traditional RAKE reception degrades when the number of users increases and the near-far effect occurs. Multi-user detection technology is an enhanced technology to overcome the influence of multiple access interference and improve the capacity of WCDMA system. It performs joint detection on multiple user signals, thereby reducing the impact of multiple access interference on the performance of the receiver as much as possible, and improving the capacity of the system.

Verdu proposed the best multi-user detector in 1986, but this detector has high complexity and is difficult to apply. Among the sub-optimal multi-user detection methods, literature [1] is a double-layer weighted parallel interference cancellation algorithm with patent application number 01132754.5, and the performance of the double-layer weighted parallel interference cancellation method proposed is better. Document [2] is the simplified algorithm of the double-layer weighted parallel interference cancellation algorithm with the patent application number 01135527.1. The simplified method proposed reduces the implementation complexity while maintaining the performance of the double-layer weighted parallel interference cancellation method. The double-layer weighted parallel interference cancellation method and its simplified method are improvements to the traditional parallel interference cancellation method, which not only minimizes the cost of symbol-level judgment, but also makes up for the deviation of user signal estimation in a statistical sense, greatly improving performance of traditional parallel interference cancellation methods.

In this paper, the simplified method of double-layer weighted parallel interference cancellation method is applied to the receiving device of the uplink dedicated physical channel, and a multi-user receiving device for the uplink dedicated physical channel is proposed.

Contents of Invention

The purpose of the present invention is to provide a multi-user receiving device for uplink dedicated physical channel in WCDMA system. The device has higher performance than traditional single-user RAKE receiving device, and greatly improves the receiving performance of uplink dedicated physical channel.

A multi-user receiving device for an uplink dedicated channel in a WCDMA system, comprising:

demodulation and matched filter, used to demodulate and match filter the signal received by the antenna to output the baseband signal;

The multipath searcher group is composed of K multipath searchers, which are used to perform multipath search on the baseband signal after demodulation and matched filtering. Each searcher is responsible for searching the path delay information of a user, and outputs all K User's multipath delay information, where K is a positive integer greater than 1;

The first-level parallel interference cancellation (PIC) structure is composed of K user signal processing units and an interference cancellation unit. Each user corresponds to a user signal processing unit. The input of the first-level PIC structure consists of baseband signals and all The multipath time delay information of K users is composed of, wherein the baseband signal enters the signal processing unit of the K users in parallel, and the multipath time delay information of the K users enters the corresponding user signal processing unit respectively, and outputs each signal after corresponding processing. The power control commands of each user, the symbol-level regenerated signal and the chip-level regenerated signal, wherein the power control commands of all K users are respectively fed back to the corresponding user’s transmitting end through the downlink, while the baseband signal and the chip-level regenerated signal of all users The regenerated signal enters the interference cancellation unit for processing and outputs a residual signal;

The last-level PIC structure includes K user signal processing units, and each user corresponds to a user signal processing unit. The input of the last-level PIC structure consists of the multipath delay information of all K users and the upper-level PIC structure The residual signal output by processing is composed of the symbol-level regenerated signals of all K users, where the residual signal output by the upper-level PIC structure processing enters the signal processing unit of K users in parallel, and the multipath delay information of K users And the symbol-level regenerated signals of all K users outputted by the upper-level PIC structure processing respectively enter corresponding user signal processing units for corresponding processing.

The present invention also includes an intermediate-level PIC structure, which is any level of PIC structure located between the first-level PIC structure and the last-level PIC structure, and it is composed of K user signal processing units and an interference cancellation unit, Each user corresponds to a user signal processing unit. The input of the intermediate-level PIC structure is the baseband signal, the multipath delay information of all K users, and the residual signal output by its upper-level PIC structure and all K The user’s symbol-level regenerated signal is composed of the residual signal output by the previous stage of PIC structure processing in parallel into the signal processing units of K users, and the multipath delay information of K users and all the output signals of the previous stage of PIC structure processing The symbol-level regenerated signals of K users enter the corresponding user signal processing units respectively, and output the symbol-level regenerated signals and chip-level regenerated signals of each user after corresponding processing, in which the baseband signal and the chip-level regenerated signals of all users enter into interference The cancellation unit performs processing and outputs a residual signal.

The number of stages of the intermediate-level PIC structure can be determined as required, and one or more intermediate-level PIC structures can be used, or no intermediate-level PIC structure can be used.

All K user signal processing units in the first-level PIC structure have the same structure and perform exactly the same functions. The user signal processing units include:

Dedicated physical control channel (DPCCH) despreading unit, the DPCCH despreading unit multipaths the input baseband signal according to the spreading code of the DPCCH channel, that is, the product of the DPCCH channel code and the scrambling code, and the input multipath delay information. Despread, and output the multipath despread result;

The channel estimation unit obtains the channel estimation results of each path from the despreading results of each path of the input DPCCH channel, and outputs it; the power control unit obtains the power control instruction from the despreading results of each path of the input DPCCH channel, and outputs As an output of the PIC structure at this stage, it is fed back to the user's transmitting end; the noise power estimation unit obtains the estimation result of the noise power of the DPCCH channel from the despreading results of each path of the input DPCCH channel, and outputs it;

The RAKE merging unit of the DPCCH channel is used to perform de-channel modulation and RAKE merging on the input DPCCH despreading result in combination with the input channel estimation result, and output the merging result;

Transport Format Combination Indication (TFCI) decoding unit, used to perform TFCI decoding on the RAKE combination result of the input DPCCH channel, obtain the spreading factor of the DPDCH channel, and output it;

Dedicated physical data channel (DPDCH) despreading unit, the DPDCH despreading unit is based on the spreading code of the DPDCH channel, that is, the product of the DPDCH channel code and the scrambling code, as well as the input multipath delay information and the DPDCH channel decoded by TFCI Spreading factor of , perform multipath despreading on the input baseband signal, and output the result of multipath despreading;

The RAKE merging unit of the DPDCH channel is used to perform de-channel modulation and RAKE merging on the input DPDCH despreading result in combination with the input channel estimation result, and output the merging result;

The DPDCH soft decision and soft decision weighting unit obtains the soft decision of each DPDCH symbol from the input signal, that is, the RAKE combination result of the DPDCH channel and the estimation result of the noise power, and then outputs the result after soft decision weighting; DPCCH soft decision and soft decision The weighting unit obtains the soft decision of each symbol of the DPCCH from the input signal, that is, the RAKE combination result of the DPCCH channel and the estimation result of the noise power, and then outputs the result after weighting the soft decision;

A signal regeneration unit, which obtains the user's symbol-level regeneration signal and chip-level regeneration signal from the DPDCH channel soft-decision weighting result, DPCCH channel soft-decision weighting result and user multipath delay information, and regenerates the chip-level signal The signal is sent to the interference cancellation unit in the current PIC structure, and the symbol-level regenerated signal is sent to the signal processing unit of the same user in the next-level PIC structure.

All K user signal processing units in the last level of PIC structure have identical structures and complete identical functions. The user signal processing units include:

The DPDCH despreading unit, the DPDCH despreading unit multiplies the input baseband signal according to the spreading code of the DPDCH channel, that is, the product of the DPDCH channel code and the scrambling code, and the input multipath delay information and the spreading factor of the DPDCH channel. Path despreading, and output multipath despreading result; DPCCH despreading unit, this DPCCH despreading unit according to the spreading code of DPCCH channel namely the product of DPCCH channel code and scrambling code, and the input multipath time delay information, input Perform multipath despreading on the baseband signal, and output the multipath despreading result;

The channel estimation unit obtains the channel estimation results of each path from the despreading results of each path of the input DPCCH channel, and outputs them; two symbol correction units are used to combine the input user's symbol-level regenerated signal to input the DPCCH respectively. The despreading result of the channel and the despreading result of the DPDCH channel perform symbol correction, and output the symbol correction results respectively; the RAKE combining unit of the DPDCH channel and the RAKE combining unit of the DPCCH channel are used to combine the input channel estimation results to respectively input the The symbol correction results of the DPCCH channel and the symbol correction results of the DPDCH channel are subjected to de-channel modulation and RAKE combination, and output the results respectively;

The channel decoder is used to perform channel decoding on the RAKE combination result of the input DPDCH channel to obtain the information bits sent by the DPDCH channel; the hard decision unit is used to perform hard judgment on the RAKE combination result of the input DPCCH channel to obtain the information bits sent by the DPCCH channel. information bits.

All K user signal processing units in the intermediate-level PIC structure have exactly the same structure and perform exactly the same function, and the user signal processing units include:

The DPDCH despreading unit, the DPDCH despreading unit multiplies the input baseband signal according to the spreading code of the DPDCH channel, that is, the product of the DPDCH channel code and the scrambling code, and the input multipath delay information and the spreading factor of the DPDCH channel. Path despreading, and output multipath despreading result; DPCCH despreading unit, this DPCCH despreading unit according to the spreading code of DPCCH channel namely the product of DPCCH channel code and scrambling code, and the input multipath time delay information, input Perform multipath despreading on the baseband signal, and output the multipath despreading result;

The channel estimation unit obtains the channel estimation results of each path by the despreading results of each path of the input DPCCH channel, and outputs it; the noise power estimation unit obtains the noise power of the DPCCH channel by the despreading results of each path of the input DPCCH channel The estimated result of and output it;

Two symbol correction units are used to perform symbol correction on the input DPCCH despreading results and DPDCH despreading results respectively in combination with the input user's symbol-level regenerated signals, and output the symbol correction results respectively; the RAKE combining unit of the DPDCH channel and the DPCCH The RAKE merging unit of the channel is used to perform de-channel modulation and RAKE merging on the input DPDCH symbol correction results and DPCCH symbol correction results respectively in combination with the input channel estimation results, and output the results respectively;

The DPDCH soft decision and soft decision weighting unit obtains the soft decision of each DPDCH symbol from the input signal, that is, the RAKE combination result of the DPDCH channel and the estimation result of the noise power, and then outputs the result after soft decision weighting; DPCCH soft decision and soft decision The weighting unit obtains the soft decision of each symbol of the DPCCH from the input signal, that is, the RAKE combination result of the DPCCH channel and the estimation result of the noise power, and then outputs the result after weighting the soft decision;

A signal regeneration unit, which obtains the user's symbol-level regeneration signal and chip-level regeneration signal from the DPDCH channel soft-decision weighting result, DPCCH channel soft-decision weighting result and user multipath delay information, and regenerates the chip-level signal The signal is sent to the interference cancellation unit in the current PIC structure, and the symbol-level regenerated signal is sent to the signal processing unit of the same user in the subsequent PIC structure.

The interference cancellation unit includes: a signal summation device, which is used to sum the input chip-level reproduction signals of each user, and then output the summation result; a shaping and matched filter unit, which is used to sum the input signal, that is, the summation result Perform shaping filtering and matched filtering, and output the filtering result; the residual calculation unit is used to subtract the input filtering result from the input baseband signal to obtain a residual signal, and use the residual signal as the PIC of the current stage The output signal is sent to the user signal processing unit of each user in the next-level PIC structure in parallel.

The last-level PIC structure and the intermediate-level PIC structure also include a spreading factor calculation unit for calculating the spreading factor of the DPDCH channel at the current level. The spreading factor calculation unit includes a TFCI decoding unit, which is used to perform TFCI decoding on the input RAKE combining result of the DPCCH channel to obtain the spreading factor of the DPDCH channel, and send the spreading factor of the DPDCH channel to the DPDCH despreading unit.

The spreading factor of the DPDCH channel used for the DPDCH despreading unit in the intermediate-level PIC structure and the last-level PIC structure can use the spreading factor of the DPDCH despreading unit in the upper-level PIC structure, or can be determined by the spreading factor of the current level Factor calculation unit provided.

The invention applies the simplified method of double-layer weighted parallel interference canceling method to the receiving device of the uplink dedicated physical channel to obtain the multi-user receiving device. The simplified method of the double-layer weighted parallel interference cancellation method reduces the implementation complexity while maintaining the performance of the double-layer weighted parallel interference cancellation method. In this way, the device can greatly improve the receiving performance of the uplink dedicated physical channel.

Description of drawings

FIG. 1 is a schematic diagram of an existing uplink dedicated physical channel single-user RAKE receiving device;

Fig. 2 is a schematic diagram of an uplink dedicated physical channel multi-user receiving device of the present invention;

3 is a schematic structural diagram of the first stage PIC in the uplink dedicated physical channel multi-user receiving device of the present invention;

Fig. 4 is a schematic structural diagram of an intermediate stage PIC in the uplink dedicated physical channel multi-user receiving device of the present invention;

Fig. 5 is a schematic diagram of the structure of the last stage PIC in the uplink dedicated physical channel multi-user receiving device of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 2 shows the uplink dedicated physical channel multi-user receiving device of the present invention. As shown in FIG. 2 , the received signal of the antenna is demodulated and matched filter 201 to obtain the baseband signal, and the baseband signal is simultaneously sent to the multipath searcher group 205 , the first-stage PIC structure 202 and the middle-stage PIC structure 203 .

The multi-path searcher group 205 searches to obtain the path-delay information of each user, and sends the path-delay information of all users to the first-level PIC structure 202 , the intermediate-level PIC structure 203 and the last-level PIC structure 204 . As shown in FIG. 2, the baseband signal enters the multipath searcher group 205. Assuming that the system has K users, the multipath searcher group 205 has K multipath searchers. Each user corresponds to a multipath searcher, where K is a positive integer greater than 1.

Processing of the first-level PIC structure

FIG. 3 shows the first stage PIC structure in the uplink dedicated physical channel multi-user receiving device of the present invention. The first-level PIC structure 202 is composed of K user signal processing units 300 and one interference cancellation unit 320 . Each user corresponds to a user signal processing unit 300 . As shown in Figure 3, the baseband signal entering the first-stage PIC structure 202 enters the signal processing unit 300 of each user in parallel, and the multipath delay information of each user entering the first-stage PIC structure 202 enters the signal processing unit of the corresponding user respectively 300. The signal processing unit 300 of each user performs exactly the same function.

The baseband signal entering the user signal processing unit 300 and the multipath delay information of the user enter the DPDCH processing channel and the DPCCH processing channel respectively.

The DPCCH despreading unit 302 performs multipath despreading on the input baseband signal according to the spreading code of the DPCCH channel, that is, the product of the DPCCH channel code and the scrambling code, and the input multipath delay information, and sends the multipath despreading result to RAKE combining unit 307 for channel estimation unit 304, power control unit 303, noise power estimation unit 308 and DPCCH channel.

The channel estimation unit 304 obtains the channel estimation of each path from the despreading results of each path of the DPCCH, and sends the channel estimation results to the RAKE combination unit 305 of the DPDCH channel and the RAKE combination unit 307 of the DPCCH channel at the same time.

The power control unit 303 obtains a power control command from the despreading results of each path of the input DPCCH channel, and feeds back the power control command as an output of the first-stage PIC to the transmitting end of the user.

The noise power estimation unit 308 obtains the estimation of the noise power of the DPCCH channel from the despreading results of each path of the DPCCH, and simultaneously sends the estimation result of the noise power to the DPDCH soft decision and soft decision weighting unit 309 and the DPCCH soft decision and soft decision weighting unit 310.

The RAKE combination unit 307 of the DPCCH channel is used to combine the input channel estimation results to perform de-channel modulation and RAKE combination on the input DPCCH despreading results, and send the combination results to the DPCCH soft decision and soft decision weighting unit 310 and TFCI interpreter respectively. Code unit 306.

The TFCI decoding unit 306 is configured to perform TFCI decoding on the input RAKE combination result of the DPCCH channel to obtain the spreading factor of the DPDCH channel, and send the spreading factor to the DPDCH despreading unit 301 .

The DPDCH despreading unit 301 performs multipath despreading on the baseband signal according to the spreading code of the DPDCH channel, that is, the product of the DPDCH channel code and the scrambling code, as well as the input multipath delay information and the spreading factor obtained after TFCI decoding , and send the multipath despreading result to the RAKE combination unit 305 of the DPDCH channel.

The RAKE combination unit 305 of DPDCH is used to perform de-channel modulation and RAKE combination on the DPDCH despreading result in combination with the input channel estimation result, and send the combination result to the DPDCH soft decision and soft decision weighting unit 309 .

The DPDCH soft decision and soft decision weighting unit 309 obtains the soft decision of each DPDCH symbol from the DPDCH RAKE combination result and the noise power estimation result, and then performs soft decision weighting. The DPCCH soft decision and soft decision weighting unit 310 obtains the soft decision of each DPCCH symbol from the DPCCH RAKE combination result and the noise power estimation result, and then performs soft decision weighting. The weight value of the soft decision weight of the DPDCH channel and the weight value of the soft decision weight of the DPCCH channel may take different values. When calculating the soft decision of the DPDCH channel, the noise power of the DPDCH channel must be converted from the estimation of the noise power of the DPCCH channel at first.

The signal regeneration unit 311 obtains the symbol-level regeneration signal and the chip-level regeneration signal of the user from the soft decision result of the DPDCH channel, the soft decision result of the DPCCH channel, and the delay information of each path of the user, and sends the chip-level regeneration signal to the interference pair Cancellation unit 320; the symbol correction subunit of the signal processing unit 400 that sends the symbol-level regenerated signal to the same user in the intermediate stage PIC structure 203. The chip-level regenerated signal of the user can be expressed as (1), and the symbol-level regenerated signal of the DPDCH channel and DPCCH channel of the user i's path can be expressed as (2) and (3) respectively:

${\mathrm{<span\; class="notranslate">\; g</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; L</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; il</span>}}{\mathrm{<span\; class="notranslate">\; c</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&tau;</span>}}_{\mathrm{<span\; class="notranslate">\; il</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>\underset{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; \&infin;</span>}{\overset{<span\; class="notranslate">\; \&infin;</span>}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; di</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&tau;</span>}}_{\mathrm{<span\; class="notranslate">\; il</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; j</span>}{\mathrm{<span\; class="notranslate">\; \&beta;</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; ci</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&tau;</span>}}_{\mathrm{<span\; class="notranslate">\; il</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; no</span>}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&tau;</span>}}_{\mathrm{<span\; class="notranslate">\; il</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; the\; s</span>}{\mathrm{<span\; class="notranslate">\; g</span>}}_{\mathrm{<span\; class="notranslate">\; dil</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; il</span>}}\underset{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; \&infin;</span>}{\overset{<span\; class="notranslate">\; \&infin;</span>}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; di</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>}\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; no</span>}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; sg</span>}}_{\mathrm{<span\; class="notranslate">\; cil</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; il</span>}}\underset{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; \&infin;</span>}{\overset{<span\; class="notranslate">\; \&infin;</span>}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; \&beta;</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; ci</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>}\mathrm{<span\; class="notranslate">\; p</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; no</span>}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Among them, L is the number of diameters; l represents the number of diameters, l=1,...... , L; A _il is the channel estimation value of the i-th user on the l-th path, and A _il is provided by the channel estimation unit: τ _il represents the time delay of the i-th user on the l-th path; c _i (t) represents the spread of user i frequency code. ρ _di ^(n)(k) and p _ci ^(n)(k) are the soft decision weighting results of the DPDCH channel and DPCCH channel in the k-level PIC structure respectively; β _c represents the amplitude ratio of the DPCCH channel to the DPDCH channel; p( t) represents a rectangular pulse with period T _b , when t∈[0, T _b ], p(t)=1; when t [0, T _b ], p(t)=0; s _d (t) is the channel code of the DPDCH channel, s _c (t) is the channel code of the DPCCH channel, and c _i (t) is the scrambling code of user i .

The chip-level regenerated signals and baseband signals of all users enter the signal summing device 321 in the interference canceling unit 320 . The signal summing device 321 sums the input chip-level reproduction signals of each user, and then sends the summation result to the shaping and matched filtering unit 322 . The shaping and matched filtering unit 322 performs shaping filtering and matching filtering on the input signal. The shaping filter is the same as the shaping filter used in the modulation part of the uplink dedicated physical channel, and the matched filter is the matched filter used in the receiving end of the uplink dedicated physical channel. The filtering result is sent to the residual calculation unit 323 . The baseband signal also enters the residual calculation unit. The residual calculation unit 323 subtracts the filtering result from the baseband signal to obtain a residual signal, and sends the residual signal to the next-level PIC structure as the output signal of the current-level PIC. In the next-level PIC structure, the signal is parallelized Signal processing unit sent to each user.

For the first-level PIC structure of the present invention, the spreading factor obtained by TFCI decoding can be used only by the current-level PIC structure, and can also be transmitted to subsequent levels of PIC structures for use by the DPDCH despreading units in the subsequent PIC structures.

Processing of PIC structures at intermediate levels

The structures of the middle levels of PICs are exactly the same, and the following uses the second level of PIC structures as an example to illustrate the processing process of the middle levels of PIC structures.

Fig. 4 shows the intermediate stage PIC structure in the uplink dedicated physical channel multi-user receiving device of the present invention. The residual signal obtained by the first-stage PIC structure 202 , the symbol-level regenerated signal of each user, and the path delay information of each user enter the intermediate-stage PIC structure 203 . The intermediate PIC structure 203 is still composed of K user signal processing units 400 and an interference cancellation unit 420 . There is one user signal processing unit 400 for each user. The user signal processing unit 400 of each user performs exactly the same function.

As shown in FIG. 4 , in the intermediate stage PIC structure 203 , the input signals of the user's signal processing unit 400 are: the residual signal, the symbol-level regenerated signal of the user, and the path delay information of the user.

The user's signal processing unit 400 first sends the user's multipath delay information and residual signal to the DPDCH channel processing channel and the DPCCH channel processing channel at the same time.

The DPDCH despreading unit 401 performs multipath despreading on the input residual signal according to the spreading code of the DPDCH channel, that is, the product of the DPDCH channel code and the scrambling code, and the input multipath delay information and the spreading factor of the DPDCH channel, And the despreading result is sent to the symbol correction unit 405 of the DPDCH channel; the DPCCH despreading unit 402 is based on the product of the spreading code of the DPCCH channel, that is, the DPCCH channel code and the scrambling code, and the input multipath time delay information, to the input residual The difference signal is subjected to multipath despreading, and the despreading result is sent to the channel estimation unit 403, the noise power estimation unit 404, and the symbol correction unit 406 of the DPCCH channel.

The channel estimation unit 403 obtains the channel estimation of each path from the despreading results of each path of the DPCCH, and sends the channel estimation results to the RAKE combination unit 407 of the DPDCH channel and the RAKE combination unit 408 of the DPCCH channel at the same time.

The noise power estimation unit 404 obtains the noise power estimation of the DPCCH channel from the input despreading results of each path of the DPCCH channel, and sends the noise power estimation results to the following two soft decision and soft decision weighting units at the same time.

The symbol correction unit 405 of the DPDCH channel performs symbol-level correction on the input despreading result of the DPDCH channel, that is, adds the despreading result of a certain path of the DPDCH channel to the symbol-level regenerated signal of the path. The symbol correction unit 406 of the DPCCH channel performs symbol-level correction on the input despreading result of the DPCCH channel, that is, adds the despreading result of a certain path of the DPCCH channel to the symbol-level regenerated signal of the path.

The RAKE combining unit 407 of the DPDCH channel and the RAKE combining unit 408 of the DPCCH channel perform de-channel modulation and multipath combining on the DPDCH symbol correction result and the DPCCH symbol correction result respectively, and send the combination result to the DPDCH soft decision and soft decision weighting respectively Unit 409 and DPCCH soft decision and soft decision weighting unit 410 .

The DPDCH soft decision and soft decision weighting unit 409 obtains the soft decision of each symbol of the DPDCH by the RAKE combination result of the input signal, that is, the DPDCH channel, and the estimation result of the noise power, and then performs soft decision weighting; the DPCCH soft decision and soft decision weighting unit 410 is composed of The input signal is the RAKE combination result of the DPCCH channel and the estimation result of the noise power to obtain the soft decision of each symbol of the DPCCH, and then perform soft decision weighting. The weight value of the soft decision weight of the DPDCH channel and the weight value of the soft decision weight of the DPCCH channel may take different values. However, the weight value of the soft decision weight of the DPDCH at this level is greater than the weight value of the soft decision weight of the previous level. The same is true for the weight of the soft decision weight of the DPCCH channel.

The signal regeneration unit 411 obtains the symbol-level regeneration signal and the chip-level regeneration signal of the user from the DPDCH channel soft decision result, the DPCCH channel soft-decision result and the user's delay information of each path, and sends the chip-level regeneration signal to the interference pair Cancellation unit 420; the symbol correction subunit that sends the symbol-level regenerated signal to the signal processing unit of the same user in the subsequent PIC structure 204.

The chip-level regenerated signals and baseband signals of all users enter the signal summing device 421 in the interference canceling unit 420 . The signal summing device 421 sums the input chip-level reproduction signals of each user, and then sends the summation result to the shaping and matched filtering unit 422 . The shaping and matched filtering unit 422 performs shaping filtering and matching filtering on the input signal. The filtering result is sent to the residual calculation unit 423 . The baseband signal also enters the residual calculation unit. The residual calculation unit 423 subtracts the filtering result from the baseband signal to obtain the residual signal, and sends the residual signal as the output signal of the PIC of the current stage to the next-stage PIC structure. In the next-stage PIC structure, the signal is parallelized Signal processing unit sent to each user.

The DPDCH despreading unit needs to know the spreading factor of the DPDCH. The spreading factor can be obtained by decoding the TFCI in the first-stage PIC structure, or can be obtained by the spreading factor calculation unit of the current-stage PIC. The spreading factor calculation unit 430 of the PIC at this stage includes a TFCI decoder 431, which performs TFCI decoding on the RAKE combination result of the DPCCH channel to obtain the spreading factor of the DPDCH channel. After the interference cancellation of the previous PIC structure, the SNR of the RAKE combined result of the DPCCH channel in the current PIC structure should be higher than the SNR of the RAKE combined result of the DPCCH channel in the previous PIC structure. Therefore, the current level The bit error rate of the spreading factor obtained by TFCI decoding will be smaller. Therefore, using the spreading factor calculation unit 430 at this stage, and using the spreading factor obtained by this unit to perform DPDCH despreading will be more beneficial to user detection. However, TFCI decoding not only increases complexity, but also increases time delay. Whether to use a spreading factor calculation unit at this stage can be determined according to needs.

Subsequent intermediate-level PIC structures perform the same operations.

Processing of the last level PIC structure

FIG. 5 shows the last stage PIC structure in the uplink dedicated physical channel multi-user receiving device of the present invention. The last-level PIC structure 204 is composed of K user signal processing units 500 . The signal processing unit 500 of the user is shown in FIG. 5 .

The input of the signal processing unit 500 is the residual signal obtained in the previous stage, the symbol-level regenerated signal, and the multipath delay information. The user signal processing unit 500 first sends the multipath delay information and the residual signal to the DPDCH processing channel and the DPCCH processing channel respectively.

The DPDCH despreading unit 501 performs multipath despreading on the input residual signal according to the spreading code of the DPDCH channel, that is, the product of the DPDCH channel code and the scrambling code, and the input multipath delay information and the spreading factor of the DPDCH channel, And the despreading result is sent to the symbol modification unit 504 of the DPDCH channel; the DPCCH despreading unit 502 is based on the product of the spreading code of the DPCCH channel, that is, the DPCCH channel code and the scrambling code, and the input multipath time delay information, to the input residual The difference signal is subjected to multipath despreading, and the despreading result is sent to the channel estimation unit 503 and the symbol correction unit 505 of the DPCCH channel.

The channel estimation unit 503 obtains the channel estimation of each path from the despreading results of each path of the DPCCH, and sends the channel estimation results to the RAKE combining unit 506 of the DPDCH channel and the RAKE combining unit 507 of the DPCCH channel at the same time.

The symbol correction unit 504 of the DPDCH channel performs symbol-level correction on the input despreading result of the DPDCH channel, that is, adds the despreading result of a certain path of the DPDCH channel to the symbol-level regenerated signal of the path. The symbol correction unit 505 of the DPCCH channel performs symbol-level correction on the input despreading result of the DPCCH channel, that is, adds the despreading result of a certain path of the DPCCH channel to the symbol-level regenerated signal of the path.

The RAKE merging unit 506 of the DPDCH channel and the RAKE merging unit 507 of the DPCCH channel perform de-channel modulation and multipath combining on the DPDCH symbol correction result and the DPCCH symbol correction result respectively in combination with the channel estimation result. The combined result of the DPDCH channel is sent to the channel decoder 508 of the DPDCH channel, and the combined result of the DPCCH channel is sent to the hard decision unit 509 of the DPCCH channel.

The channel decoder 508 performs channel decoding on the input signal to obtain information bits sent by the DPDCH channel.

The hard decision unit 509 performs hard decision on the input signal to obtain the information bits sent by the DPCCH channel.

The despreading unit 501 of the DPDCH needs to know the spreading factor of the DPDCH. The spreading factor can be obtained by decoding the TFCI in the previous stage of the PIC structure, or can be obtained by the spreading factor calculation unit 510 of the current stage of the PIC. Whether to use a spreading factor calculation unit at this stage can be determined according to needs.

The number of stages of the PIC structure can be determined as required. It is possible to use only the first-level and last-level PIC structures, or more levels of PIC structures.

Claims (10)

1. multi-user's receiving system of uplink special physical channel in a Wideband Code Division Multiple Access (WCDMA) (WCDMA) system is characterized in that described multi-user's receiving system comprises:

Separate the mediation matched filter, be used for the received signal of antenna is separated the mediation matched filtering with the output baseband signal;

The multipath group, be made up of K multipath, be used for carrying out Multipath searching to separating the baseband signal that is in harmonious proportion after the matched filtering, each searcher is responsible for searching for a user's footpath time delay information, export all K user's multidiameter delay information, wherein K is the positive integer greater than 1;

First order parallel interference cancellation (PIC) structure, constitute by K subscriber signal processing unit and an interference cancellation unit, the corresponding subscriber signal processing unit of each user, the input of described first order PIC structure is made up of described baseband signal and all K user's multidiameter delay information, baseband signal and be advanced into a described K user's signal processing unit wherein, and K user's multidiameter delay information enters corresponding subscriber signal processing unit respectively, export each user's power control instruction through respective handling, symbol level regenerated signal and chip-level regenerated signal, wherein all K user's power control instruction feeds back to the transmitting terminal of relative users respectively through down link, and baseband signal and all users' chip-level regenerated signal enters the interference cancellation unit and handles the output residual signals;

Afterbody PIC structure, comprise K subscriber signal processing unit, the corresponding subscriber signal processing unit of each user, the input of described afterbody PIC structure is by all K user's multidiameter delay information, and the residual signals of upper level PIC structure treatment output and all K user's symbol level regenerated signal is formed, the residual signals of wherein said upper level PIC structure treatment output also is advanced into a described K user's signal processing unit, and all K user's of K user's multidiameter delay information and the output of upper level PIC structure treatment symbol level regenerated signal enters corresponding subscriber signal processing unit respectively, handles accordingly.

2. multi-user's receiving system as claimed in claim 1, it is further characterized in that, described multi-user's receiving system also comprises intergrade PIC structure, described intergrade PIC structure is an arbitrary grade of PIC structure between first order PIC structure and described afterbody PIC structure, it comprises K subscriber signal processing unit and an interference cancellation unit, the corresponding subscriber signal processing unit of each user, the input of described intergrade PIC structure is by baseband signal, all K user's multidiameter delay information, and the residual signals of its upper level PIC structure treatment output and all K user's symbol level regenerated signal is formed, the residual signals of upper level PIC structure treatment output and be advanced into a described K user's signal processing unit wherein, and all K user's of K user's multidiameter delay information and the output of upper level PIC structure treatment symbol level regenerated signal enters corresponding subscriber signal processing unit respectively, the process respective handling is exported each user's symbol level regenerated signal and chip-level regenerated signal, and wherein baseband signal and all users' chip-level regenerated signal enters the interference cancellation unit and handles the output residual signals.

3. multi-user's receiving system as claimed in claim 2, it is further characterized in that the progression of described intergrade PIC structure can be determined as required, can use one or more levels intergrade PIC structure, also can not use intergrade PIC structure.

4. multi-user's receiving system as claimed in claim 1, it is further characterized in that K subscriber signal processing unit comprises in the described first order PIC structure:

Dedicated Physical Control Channel (DPCCH) despread unit, described DPCCH despread unit is that DPCCH channel code and scrambler are long-pending according to the spreading code of DPCCH channel, and the multidiameter delay information of input, the baseband signal of input is carried out multi path despreading, and output multi path despreading result;

Channel estimating unit obtains the channel estimation results in each footpath by each footpath despreading result of the DPCCH channel of input, and with its output;

Power control unit obtains power control instruction by each footpath despreading result of the DPCCH channel of input, and with its output as described first order PIC structure, feeds back to user's transmitting terminal;

The noise power estimation unit obtains the estimated result of the noise power of DPCCH channel by each footpath despreading result of the DPCCH channel of input, and with its output;

The RAKE merge cells of DPCCH channel is used in conjunction with the channel estimation results of input the DPCCH despreading result who imports being write to modulate and the RAKE merging, and amalgamation result is exported;

Transformat combination indication (TFCI) decoding unit is used for the RAKE amalgamation result of the DPCCH channel of input is carried out TFCI decoding, obtains the spreading factor of DPDCH channel, and with its output;

Dedicated Physical Data Channel (DPDCH) despread unit, described DPDCH despread unit is that DPDCH channel code and scrambler are long-pending according to the spreading code of DPDCH channel, and the spreading factor of the multidiameter delay information of input and the DPDCH channel after TFCI decoding, baseband signal to input is carried out multi path despreading, and output multi path despreading result;

The RAKE merge cells of DPDCH channel is used in conjunction with the channel estimation results of input the DPDCH despreading result who imports being write to modulate and the RAKE merging, and amalgamation result is exported;

DPDCH soft-decision and soft-decision weighted units are the soft-decision that the estimated result of the RAKE amalgamation result of DPDCH channel and noise power obtains each symbol of DPDCH by input signal, carry out its result of output after the soft-decision weighting then;

DPCCH soft-decision and soft-decision weighted units are the soft-decision that the estimated result of the RAKE amalgamation result of DPCCH channel and noise power obtains each symbol of DPCCH by input signal, carry out its result of output after the soft-decision weighting then;

The signal regeneration unit, described signal regeneration unit is obtained user's symbol level regenerated signal and chip-level regenerated signal by DPDCH channel soft-decision weighted results, DPCCH channel soft-decision weighted results and user's multidiameter delay information, and the chip-level regenerated signal sent into interference cancellation unit in the described first order PIC structure, the symbol level regenerated signal is given the signal processing unit of same user in the next stage PIC structure.

5. multi-user's receiving system as claimed in claim 1, it is further characterized in that K subscriber signal processing unit comprises in the described afterbody PIC structure:

The DPDCH despread unit, described DPDCH despread unit is that DPDCH channel code and scrambler are long-pending according to the spreading code of DPDCH channel, and the multidiameter delay information of input and the spreading factor of DPDCH channel, the residual signals of importing is carried out multi path despreading, and output multi path despreading result;

The DPCCH despread unit, described DPCCH despread unit is that DPCCH channel code and scrambler are long-pending according to the spreading code of DPCCH channel, and the multidiameter delay information of input, and the residual signals of importing is carried out multi path despreading, and output multi path despreading result;

Channel estimating unit obtains the channel estimation results in each footpath by each footpath despreading result of the DPCCH channel of input, and with its output;

Two symbol amending units are used for respectively the despreading result of DPCCH channel of input and the despreading result of DPDCH channel being carried out the symbol correction in conjunction with the user's of input symbol level regenerated signal, and respectively the symbol correction result are exported;

The RAKE merge cells of DPDCH channel and the RAKE merge cells of DPCCH channel, be used in conjunction with the channel estimation results of input respectively to the symbol correction result of the symbol correction result of DPDCH channel of input and DPCCH channel write to modulation and RAKE merging, and respectively the result exported;

Channel decoder is used for the RAKE amalgamation result of DPDCH channel to input and carries out channel-decoding and obtain the information bit that the DPDCH channel sends;

The hard decision device is used for the RAKE amalgamation result of DPCCH channel of input is carried out hard decision, obtains the information bit that the DPCCH channel sends.

6. multi-user's receiving system as claimed in claim 2, it is further characterized in that K subscriber signal processing unit comprises in the described intergrade PIC structure:

The DPDCH despread unit, described DPDCH despread unit is that DPDCH channel code and scrambler are long-pending according to the spreading code of DPDCH channel, and the multidiameter delay information of input and the spreading factor of DPDCH channel, the residual signals of importing is carried out multi path despreading, and output multi path despreading result;

The DPCCH despread unit, described DPCCH despread unit is that DPCCH channel code and scrambler are long-pending according to the spreading code of DPCCH channel, and the multidiameter delay information of input, and the residual signals of importing is carried out multi path despreading, and output multi path despreading result;

Channel estimating unit obtains the channel estimation results in each footpath by each footpath despreading result of the DPCCH channel of input, and with its output;

The noise power estimation unit obtains the estimated result of the noise power of DPCCH channel by each footpath despreading result of the DPCCH channel of input, and with its output;

Two symbol amending units are used for respectively the DPCCH despreading result and the DPDCH despreading result of input being carried out the symbol correction in conjunction with the user's who imports symbol level regenerated signal, and respectively the symbol correction result are exported;

The RAKE merge cells of DPDCH channel and the RAKE merge cells of DPCCH channel, be used in conjunction with the channel estimation results of input respectively to the symbol correction result of the symbol correction result of DPDCH channel of input and DPCCH channel write to modulation and RAKE merging, and respectively the result exported;

DPDCH soft-decision and soft-decision weighted units are the soft-decision that the estimated result of the RAKE amalgamation result of DPDCH channel and noise power obtains each symbol of DPDCH by input signal, carry out its result of output after the soft-decision weighting then;

DPCCH soft-decision and soft-decision weighted units are the soft-decision that the estimated result of the RAKE amalgamation result of DPCCH channel and noise power obtains each symbol of DPCCH by input signal, carry out its result of output after the soft-decision weighting then;

The signal regeneration unit, described signal regeneration unit is obtained user's symbol level regenerated signal and chip-level regenerated signal by DPDCH channel soft-decision weighted results, DPCCH channel soft-decision weighted results and user's multidiameter delay information, and the chip-level regenerated signal sent into interference cancellation unit in the PIC structure at the corresponding levels, the symbol level regenerated signal is given the signal processing unit of same user in the one-level PIC structure of described back.

7. as claim 5 or 6 described multi-user's receiving systems, it is further characterized in that, the spreading factor that is used for the described channel of DPDCH despread unit in described intergrade PIC structure and described afterbody PIC structure can use the spreading factor of upper level PIC structure DPDCH despread unit, also can be provided by the spreading factor computing unit of the corresponding levels.

8. multi-user's receiving system as claimed in claim 1 or 2, it is further characterized in that described interference cancellation unit comprises:

The signal summing unit is used for each user's the chip-level regenerated signal of input is sued for peace, and then summed result is exported;

Moulding and matched filtering unit are used for the summed result of described signal summing unit is carried out molding filtration and matched filtering, and the filtering result are exported;

The residual computations unit, be used for deducting the filtering result of described moulding and matched filtering unit from the baseband signal of input, obtain residual signals, and with described residual signals as the parallel subscriber signal processing unit of giving each user in the next stage PIC structure of the output signal of PIC at the corresponding levels.

9. multi-user's receiving system as claimed in claim 1 or 2, it is further characterized in that described afterbody PIC structure and described intergrade PIC structure also comprise the spreading factor computing unit, is used to calculate the spreading factor of DPDCH channel at the corresponding levels.

10. multi-user's receiving system as claimed in claim 9, it is further characterized in that, described spreading factor computing unit comprises the TFCI decoding unit, be used for the RAKE amalgamation result of DPCCH channel of input is carried out the spreading factor that TFCI decoding obtains the DPDCH channel, and the spreading factor of DPDCH channel is delivered to the DPDCH despread unit.

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