CN1505294A - A multi-user receiving device of uplink dedicated physical channel in WCDMA system - Google Patents

Abstract

The invention provides a multi-user reception device of upstream special physical channel in wideband code division multiple accesses, the device relates to multi-user detecting technology of base station in WCDMA honeycomb mobile communication system. The multi-user detecting technology is an enhanced technology of CDMA system; it uses double-layer weighting parallel interference counteraction method and its simplified method can upgrade the performance of traditional method. And the invention upgrades the reception performance of upstream physical channel.

Description

Multi-user's receiving system of uplink special physical channel in a kind of WCDMA system

Technical field

The present invention relates to communication system, relate in particular to the multiuser detection of base station in Wideband Code Division Multiple Access (WCDMA) (WCDMA) cell mobile communication systems.

Background technology

The agreement of 3GPP has been compiled a complete set of standard of WCDMA system.According to the agreement of 3GPP, the information bit of special-purpose physical data channel (DPDCH) carries out chnnel coding earlier in the uplink special physical channel, carries out binary phase shift keying (BPSK) mapping and spread spectrum then.And the information bit of Dedicated Physical Control Channel (DPCCH) directly carries out BPSK mapping and spread spectrum.DPDCH channel chip behind the spread spectrum and DPCCH channel chip constitute I, Q two paths of data, carry out scrambling together and handle.I after the scrambling, Q two-way chip carry out pulse-shaping respectively, send to the base station by carrier modulation respectively then.In 25.104,25.944 and 25.212 agreements of 3GPP, stipulated the channel coding schemes of DPDCH channel in the uplink special physical channel.The spread spectrum of uplink special physical channel, scrambling, pulse-shaping and modulator approach are seen 25.213 agreements of 3GPP.

It more than is user side in the WCDMA system (UE) sends bit on uplink special physical channel process.At the base station of WCDMA system end the bit that UE sends on uplink special physical channel is received according to following process:

What Fig. 1 showed is single RAKE receiving system with corpse of uplink special physical channel.As shown in Figure 1, at first the received signal of antenna is carried out demodulation process and matched filtering, obtain baseband signal; Baseband signal is carried out Multipath searching, obtain multidiameter delay information.Enter DPDCH treatment channel and DPCCH treatment channel when baseband signal and multidiameter delay information of same.The DPCCH treatment channel is carried out DPCCH despreading, channel estimating and RAKE according to multidiameter delay information to baseband signal and is merged, and gives TFCI decoding unit 101 and DPCCH hard decision unit 102 with the RAKE amalgamation result of DPCCH.TFCI decoding unit 101 is deciphered the spreading factor that obtains DPDCH by the RAKE amalgamation result of DPCCH, and gives DPDCH despread unit 104 with spreading factor.The RAKE amalgamation result of the 102 couples of DPCCH in DPCCH hard decision unit carries out hard decision, obtains the information bit of DPCCH channel.

The DPDCH treatment channel is carried out the RAKE merging of DPDCH despreading, DPDCH according to the spreading factor of multidiameter delay information and DPDCH to baseband signal, and gives decoder 103 with the RAKE amalgamation result of DPDCH channel and decipher.The RAKE amalgamation result of 103 couples of DPDCH of decoder is deciphered, and obtains the information bit of DPDCH channel.The decoding of DPDCH channel is the anti-process of DPDCH chnnel coding.The RAKE receiving course of uplink special physical channel information bit in the WCDMA system that Here it is.

The WCDMA system is an interference limiting system.The multiple access interference-limited the further raising of WCDMA power system capacity.The number of users that is received in traditional RAKE increase with near-far interference under performance reduce.Multiuser detection is to overcome the influence that multiple access disturbs, and improves a kind of Enhanced Technology of WCDMA power system capacity.It carries out joint-detection to a plurality of subscriber signals, disturbs the receiver Effect on Performance thereby reduce multiple access as much as possible, improves the capacity of system.

Verdu proposed best multi-user detector in 1986, but this detector complexity height is difficult to use.In the multi-user test method of suboptimum, document [1] is that number of patent application is 01132754.5 double-weighing parallel interference cancellation algorithm, and the double-weighing parallel interference cancellation method performance of proposition is relatively good.Document [2] is that number of patent application is the shortcut calculation of 01135527.1 double-weighing parallel interference cancellation algorithm, and the method for simplifying of proposition has reduced implementation complexity when keeping double-weighing parallel interference cancellation method performance.Double-weighing parallel interference cancellation method and method for simplifying thereof are the improvement to traditional parallel interference cancellation method, not only make the cost minimum of symbol level judgement, and can remedy the deviation of on the statistical significance subscriber signal being estimated, improved the performance of traditional parallel interference cancellation method greatly.

This paper is applied to the receiving system of uplink special physical channel with the method for simplifying of double-weighing parallel interference cancellation method, proposes a kind of multi-user's receiving system of uplink special physical channel.

Summary of the invention

The object of the present invention is to provide multi-user's receiving system of uplink special physical channel in a kind of WCDMA system, this device has the performance that is higher than traditional single user RAKE receiving system, has improved the receptivity of uplink special physical channel greatly.

Multi-user's receiving system of special uplink channel in a kind of WCDMA 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 this first order PIC structure is made up of 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 this 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 upper level PIC structure treatment output and be advanced into 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, handles accordingly.

The present invention also comprises intergrade PIC structure, it is an arbitrary grade of PIC structure between first order PIC structure and described afterbody PIC structure, it is made of K subscriber signal processing unit and an interference cancellation unit, the corresponding subscriber signal processing unit of each user, the input of this 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 previous stage PIC structure treatment output and be advanced into 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.

The progression of intergrade PIC structure can be determined as required, can use one or more levels intergrade PIC structure, also can not use intergrade PIC structure.

The structure of the subscriber signal processing unit of all K in the first order PIC structure is identical, finishes identical function, and this subscriber signal processing unit comprises:

Dedicated Physical Control Channel (DPCCH) despread unit, this 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 PIC structure at the corresponding levels, 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, this 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, this 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 next stage PIC structure.

The structure of the subscriber signal processing unit of all K in the afterbody PIC structure is identical, finishes identical function, and described subscriber signal processing unit comprises:

The DPDCH despread unit, this 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 baseband signal of input is carried out multi path despreading, and output multi path despreading result; The DPCCH despread unit, this 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 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; 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 DPCCH channel of input and DPDCH 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.

The structure of the subscriber signal processing unit of all K in the intergrade PIC structure is identical, finishes identical function, and described subscriber signal processing unit comprises:

The DPDCH despread unit, this 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 baseband signal of input is carried out multi path despreading, and output multi path despreading result; The DPCCH despread unit, this 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 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; 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 DPDCH symbol correction result of input and DPCCH symbol correction result 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, this 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 back.

The interference cancellation unit comprises: the signal summing unit, be 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, being used for input signal is that summed result is carried out molding filtration and matched filtering, and the filtering result is exported; The residual computations unit is used for deducting the filtering result of input from the baseband signal of input, obtains 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.

Afterbody PIC structure and intergrade PIC structure also comprise the spreading factor computing unit, are used to calculate the spreading factor of DPDCH channel at the corresponding levels.This spreading factor computing unit comprises the TFCI decoding unit, is 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.

The spreading factor that is used for the DPDCH channel of DPDCH despread unit in intergrade PIC structure and 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.

The present invention is applied to the receiving system of uplink special physical channel with the method for simplifying of double-weighing parallel interference cancellation method, obtains multi-user's receiving system.The method for simplifying of double-weighing parallel interference cancellation method when keeping double-weighing parallel interference cancellation method performance, has reduced implementation complexity.This device can improve the receptivity of uplink special physical channel greatly like this.

Description of drawings

Fig. 1 is existing uplink special physical channel list user RAKE receiving system schematic diagram;

Fig. 2 is a uplink special physical channel multi-user receiving system schematic diagram of the present invention;

Fig. 3 is a first order PIC structural representation in the uplink special physical channel multi-user receiving system of the present invention;

Fig. 4 is an intergrade PIC structural representation in the uplink special physical channel multi-user receiving system of the present invention;

Fig. 5 is an afterbody PIC structural representation in the uplink special physical channel multi-user receiving system of the present invention.

Embodiment

The present invention is further illustrated below in conjunction with drawings and Examples.

What Fig. 2 showed is uplink special physical channel multi-user receiving system of the present invention.As shown in Figure 2, the received signal of antenna obtains baseband signal through separating mediation matched filter 201, and baseband signal is sent into multipath group 205, first order PIC structure 202 and middle PIC structure 203 at different levels simultaneously.

Multipath group 205 search obtains each user's footpath time delay information, and gives first order PIC structure 202, intergrade PIC structure 203 and afterbody PIC structure 204 during with all users' footpath time delay information of same.As shown in Figure 2, baseband signal enters multipath group 205, and the system of setting up departments has K user, and multipath group 205 just has K multipath.The corresponding multipath of each user, wherein K is the positive integer greater than 1.

The processing of first order PIC structure

What Fig. 3 showed is first order PIC structure in the uplink special physical channel multi-user receiving system of the present invention.First order PIC structure 202 is made of K subscriber signal processing unit 300 and an interference cancellation unit 320.The corresponding subscriber signal processing unit 300 of each user.As shown in Figure 3, enter the baseband signal of first order PIC structure 202 and be advanced into each user's signal processing unit 300, the multidiameter delay information that enters each user of first order PIC structure 202 enters the signal processing unit 300 of relative users respectively.Each user's signal processing unit 300 is finished identical function.

Enter the baseband signal of subscriber signal processing unit 300 and user's multidiameter delay information and enter DPDCH treatment channel and DPCCH treatment channel respectively.

DPCCH despread unit 302 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, baseband signal to input is carried out multi path despreading, and the multi path despreading result is given the RAKE merge cells 307 of channel estimating unit 304, power control unit 303, noise power estimation unit 308 and DPCCH channel.

Channel estimating unit 304 obtains each channel estimating directly by the despreading result in each footpath of DPCCH, and gives the RAKE merge cells 305 of DPDCH channel, the RAKE merge cells 307 of DPCCH channel simultaneously with channel estimation results.

Power control unit 303 obtains power control instruction by each footpath despreading result of the DPCCH channel of input, and with the output of power control instruction as first order PIC, feeds back to user's transmitting terminal.

Noise power estimation unit 308 obtains the estimation of the noise power of DPCCH channel by the despreading result in each footpath of DPCCH, and gives DPDCH soft-decision and soft-decision weighted units 309 and DPCCH soft-decision and soft-decision weighted units 310 simultaneously with the estimated result of noise power.

The RAKE merge cells 307 of DPCCH channel, be used for the DPCCH despreading result who imports being write to modulate and the RAKE merging, and give DPCCH soft-decision and soft-decision weighted units 310 and TFCI decoding unit 306 respectively amalgamation result in conjunction with the channel estimation results of input.

TFCI decoding unit 306 is used for the RAKE amalgamation result of DPCCH channel of input is carried out TFCI decoding, obtains the spreading factor of DPDCH channel, and gives DPDCH despread unit 301 with spreading factor.

DPDCH despread unit 301 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 that after TFCI decoding, obtains, baseband signal is carried out multi path despreading, and the multi path despreading result is given the RAKE merge cells 305 of DPDCH channel.

The RAKE merge cells 305 of DPDCH is used in conjunction with the channel estimation results of input DPDCH despreading result being write to modulate and the RAKE merging, and gives DPDCH soft-decision and soft-decision weighted units 309 with amalgamation result.

DPDCH soft-decision and soft-decision weighted units 309 obtain the soft-decision of each symbol of DPDCH by the estimated result of the RAKE amalgamation result of DPDCH and noise power, carry out the soft-decision weighting then.DPCCH soft-decision and soft-decision weighted units 310 obtain the soft-decision of each symbol of DPCCH by the estimated result of the RAKE amalgamation result of DPCCH and noise power, carry out the soft-decision weighting then.The weights of the soft-decision weighting of DPDCH channel can be got different numerical value with the weights of DPCCH channel soft-decision weighting.The DPDCH channel when calculating soft-decision, the noise power that at first will convert out the DPDCH channel by the estimation of DPCCH channel noise power.

Signal regeneration unit 311 obtains user's symbol level regenerated signal and chip-level regenerated signal by each footpath time delay information of the soft-decision result of DPDCH channel soft-decision result, DPCCH channel and user, and the chip-level regenerated signal is sent into interference cancellation unit 320; The symbol level regenerated signal is flowed to the symbol correction subelement of the signal processing unit 400 of same user in the intergrade PIC structure 203.User's chip-level regenerated signal can be expressed as (1) formula, and the DPDCH channel in user i l footpath and the symbol level regenerated signal of DPCCH channel can be expressed as (2) formula and (3) formula respectively:

$g_i^{\left(k\right)}\left(t\right)=\underset{l=1}{\overset{L}{\mathrm{\Σ}}}{A}_{\mathrm{il}}{c}_i(t-{\mathrm{\τ}}_{\mathrm{il}})\left(\underset{n=-\∞}{\overset{\∞}{\mathrm{\Σ}}}({\mathrm{\ρ}}_{\mathrm{di}}^{\left(n\right)\left(k\right)}{s}_d(t-{\mathrm{\τ}}_{\mathrm{il}})+j{\mathrm{\β}}_c{\mathrm{\ρ}}_{\mathrm{ci}}^{\left(n\right)\left(k\right)}{s}_c(t-{\mathrm{\τ}}_{\mathrm{il}}))p(t-n{T}_b-{\mathrm{\τ}}_{\mathrm{il}})\right)----\left(1\right)$

$s{g}_{\mathrm{dil}}^{\left(k\right)}\left(t\right)=A_{\mathrm{il}}\underset{n=-\∞}{\overset{\∞}{\mathrm{\Σ}}}{\mathrm{\ρ}}_{\mathrm{di}}^{\left(n\right)\left(k\right)}p(t-n{T}_b)---\left(2\right)$

${\mathrm{sg}}_{\mathrm{cil}}^{\left(k\right)}\left(t\right)=A_{\mathrm{il}}\underset{n=-\∞}{\overset{\∞}{\mathrm{\Σ}}}{\mathrm{\β}}_c{\mathrm{\ρ}}_{\mathrm{ci}}^{\left(n\right)\left(k\right)}p(t-n{T}_b)---\left(3\right)$

Wherein, L is the footpath number; L represent the footpath number, l=1 ..., L; A _IlBe the channel estimation value in i user l footpath, A _IlProvide by channel estimating unit: τ _IlThe time delay of representing i user l footpath; c _i(t) spreading code of expression user i.ρ _Di ^{(n) (k)}, p _Ci ^{(n) (k)}Be respectively the result of DPDCH channel and the weighting of DPCCH channel soft-decision in the k level PIC structure; β _cThe amplitude ratio of expression DPCCH channel and DPDCH channel; P (t) indication cycle is T _bRectangular pulse, when t ∈ [0, T _b] time, p (t)=1; Work as t [0, T _b] time, p (t)=0; s _d(t) be the channel code of DPDCH channel, s _c(t) be the channel code of DPCCH channel, c _i(t) be the scrambler of user i.

All users' chip-level regenerated signal and baseband signal enter the signal summing unit 321 in the interference cancellation unit 320.Each user's of 321 pairs of inputs of this signal summing unit chip-level regenerated signal is sued for peace, and then summed result is given moulding and matched filtering unit 322.The 322 pairs of input signals in this moulding and matched filtering unit carry out molding filtration and matched filtering.The formed filter that formed filter adopts with up DPCH modulating part, matched filter are exactly the matched filter that the uplink special physical channel receiving terminal adopts.The filtering result sends into residual computations unit 323.Baseband signal also enters the residual computations unit.Residual computations unit 323 deducts the filtering result from baseband signal, obtain residual signals, and give next stage PIC structure as the output signal of PIC at the corresponding levels with residual signals, in next stage PIC structure, this signal is by the parallel signal processing unit of giving each user.

To first order PIC structure of the present invention, the spreading factor that TFCI decoding obtains can only use for PIC structure at the corresponding levels, also can be transferred to subsequent stages PIC structure, uses for DPDCH despread unit in the follow-up PIC structure.

The processing of middle PIC structures at different levels

The structure of middle PIC at different levels is just the same, is the processing procedure of PIC structures at different levels in the middle of example illustrates below with second level PIC structure.

What Fig. 4 showed is intergrade PIC structure in the uplink special physical channel multi-user receiving system of the present invention.The residual signals that first order PIC structure 202 obtains, each user's symbol level regenerated signal and each user's footpath time delay information enters intergrade PIC structure 203.Intergrade PIC structure 203 still is made of K subscriber signal processing unit 400 and an interference cancellation unit 420.Each user has a subscriber signal processing unit 400.Each user's subscriber signal processing unit 400 is finished identical function.

As shown in Figure 4, in intergrade PIC structure 203, the input signal of user's signal processing unit 400 is: residual signals, this user's symbol level regenerated signal and this user's footpath time delay information.

User's signal processing unit 400 is at first given DPDCH Channel Processing passage and DPCCH Channel Processing passage user's multidiameter delay information and residual signals simultaneously.

DPDCH despread unit 401 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, residual signals to input carries out multi path despreading, and the despreading result is given the symbol amending unit 405 of DPDCH channel; DPCCH despread unit 402 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, residual signals to input carries out multi path despreading, and the despreading result is given the symbol amending unit 406 of channel estimating unit 403, noise power estimation unit 404 and DPCCH channel.

Channel estimating unit 403 obtains each channel estimating directly by the despreading result in each footpath of DPCCH, and gives the RAKE merge cells 407 of DPDCH channel, the RAKE merge cells 408 of DPCCH channel simultaneously with channel estimation results.

Noise power estimation unit 404 obtains the estimation of the noise power of DPCCH channel by each footpath despreading result of the DPCCH channel of input, and the estimated result of noise power is given simultaneously two soft-decisions and the soft-decision weighted units of back.

The despreading result of the DPDCH channel of 405 pairs of inputs of symbol amending unit of DPDCH channel carries out the symbol level correction, is about to the despreading result in DPDCH channel footpath and the symbol level regenerated signal addition in this footpath.The despreading result of the DPCCH channel of 406 pairs of inputs of symbol amending unit of DPCCH channel carries out the symbol level correction, is about to the despreading result in DPCCH channel footpath and the symbol level regenerated signal addition in this footpath.

The RAKE merge cells 407 of DPDCH channel and the RAKE merge cells 408 of DPCCH channel, give DPDCH soft-decision and soft-decision weighted units 409 and DPCCH soft-decision and soft-decision weighted units 410 respectively respectively to DPDCH symbol correction result and DPCCH symbol correction result write to modulation and multipath merging, and with amalgamation result.

DPDCH soft-decision and soft-decision weighted units 409 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 the soft-decision weighting then; DPCCH soft-decision and soft-decision weighted units 410 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 the soft-decision weighting then.The weights of the soft-decision weighting of DPDCH channel can be got different numerical value with the weights of DPCCH channel soft-decision weighting.But the weights of the soft-decision weighting of DPDCH at the corresponding levels are greater than the weights of previous stage soft-decision weighting.The weights of the soft-decision weighting of DPCCH channel also are like this.

Signal regeneration unit 411 obtains user's symbol level regenerated signal and chip-level regenerated signal by each footpath time delay information of the soft-decision result of DPDCH channel soft-decision result, DPCCH channel and user, and the chip-level regenerated signal is sent into interference cancellation unit 420; The symbol level regenerated signal is flowed to the symbol correction subelement of same user's signal processing unit in the one-level PIC structure 204 of back.

All users' chip-level regenerated signal and baseband signal enter the signal summing unit 421 in the interference cancellation unit 420.Each user's of 421 pairs of inputs of this signal summing unit chip-level regenerated signal is sued for peace, and then summed result is given moulding and matched filtering unit 422.The 422 pairs of input signals in this moulding and matched filtering unit carry out molding filtration and matched filtering.The filtering result sends into residual computations unit 423.Baseband signal also enters the residual computations unit.Residual computations unit 423 deducts the filtering result from baseband signal, obtain residual signals, and give next stage PIC structure as the output signal of PIC at the corresponding levels with residual signals, in next stage PIC structure, this signal is by the parallel signal processing unit of giving each user.

The despread unit of DPDCH need be known the spreading factor of DPDCH, and spreading factor can use the spreading factor that TFCI decoding obtains in the first order PIC structure, also can be obtained by the spreading factor computing unit of PIC at the corresponding levels.The spreading factor computing unit 430 of PIC at the corresponding levels comprises TFCI decoder 431, carries out TFCI decoding by the RAKE amalgamation result to the DPCCH channel, obtains the spreading factor of DPDCH channel.Interference cancellation through previous stage PIC structure, the signal to noise ratio of the RAKE amalgamation result of DPCCH channel should be than the signal to noise ratio height of the RAKE amalgamation result of DPCCH channel in the previous stage PIC structure in the PIC structure at the corresponding levels, so the error rate of the spreading factor that TFCI decoding at the corresponding levels obtains will be littler.Therefore, adopt spreading factor computing unit 430 in the corresponding levels, and the spreading factor that uses this unit to obtain carrying out the despreading of DPDCH, will be more favourable to user's detection.But TFCI decoding has not only increased complexity, and has increased time delay.Can determine whether as required to adopt the spreading factor computing unit in the corresponding levels.

Each later intergrade PIC structure is finished identical operations.

The processing of afterbody PIC structure

What Fig. 5 showed is afterbody PIC structure in the uplink special physical channel multi-user receiving system of the present invention.Afterbody PIC structure 204 is made of K subscriber signal processing unit 500.User's signal processing unit 500 as shown in Figure 5.

Signal processing unit 500 be input as residual signals and symbol level regenerated signal that previous stage obtains and multidiameter delay information.Subscriber signal processing unit 500 is at first sent multidiameter delay information and residual signals into DPDCH treatment channel and DPCCH treatment channel respectively.

DPDCH despread unit 501 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, residual signals to input carries out multi path despreading, and the despreading result is given the symbol amending unit 504 of DPDCH channel; DPCCH despread unit 502 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, residual signals to input carries out multi path despreading, and the despreading result is given the symbol amending unit 505 of channel estimating unit 503 and DPCCH channel.

Channel estimating unit 503 obtains each channel estimating directly by the despreading result in each footpath of DPCCH, and gives the RAKE merge cells 506 of DPDCH channel, the RAKE merge cells 507 of DPCCH channel simultaneously with channel estimation results.

The despreading result of the DPDCH channel of 504 pairs of inputs of symbol amending unit of DPDCH channel carries out the symbol level correction, is about to the despreading result in DPDCH channel footpath and the symbol level regenerated signal addition in this footpath.The despreading result of the DPCCH channel of 505 pairs of inputs of symbol amending unit of DPCCH channel carries out the symbol level correction, is about to the despreading result in DPCCH channel footpath and the symbol level regenerated signal addition in this footpath.

The RAKE merge cells 506 of DPDCH channel and the RAKE merge cells 507 of DPCCH channel, respectively in conjunction with channel estimation results to DPDCH symbol correction result and DPCCH symbol correction result write to modulation and multipath merging.The amalgamation result of DPDCH channel is sent into the channel decoder 508 of DPDCH passage, and the amalgamation result of DPCCH channel is given the hard decision device 509 of DPCCH passage.

508 pairs of input signals of channel decoder carry out channel-decoding and obtain the information bit that the DPDCH channel sends.

509 pairs of input signals of hard decision device carry out hard decision, obtain the information bit that the DPCCH channel sends.

Wherein the despread unit 501 of DPDCH need be known the spreading factor of DPDCH, and spreading factor can use the spreading factor that TFCI decoding obtains in the previous stage PIC structure, also can be obtained by the spreading factor computing unit 510 of PIC at the corresponding levels.Can determine whether as required to adopt the spreading factor computing unit in the corresponding levels.

The progression of PIC structure can be determined as required.Can only adopt the first order and afterbody PIC structure, also can adopt more multistage PIC structure.

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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