CN1508993A - Method for coding channels for multi-user reception in WCDMA system - Google Patents
Method for coding channels for multi-user reception in WCDMA system Download PDFInfo
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Abstract
The method for coding channel is for dedicated physical data channel (DPDCH) of 12.2 kbps up run dedicated physical data channel particularly. Under condition of raising factor of spread spectrum and lowering complexity of encoder and decoder, capability of detecting DPDCH and dedicated physical control channel (DPCCH) of multiple users' receiving set is kept and improved slightly.
Description
Technical field
The present invention relates to communication system, relate in particular to the channel coding technology of uplink special physical channel in Wideband Code Division Multiple Access (WCDMA) (WCDMA) cell mobile communication systems and the multiuser detection of base station.
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 biphase 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, and its spreading factor is 256.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 method 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.The reception of the bit that UE is sent on uplink special physical channel at the base station of WCDMA system end can be adopted the RAKE reception technique.The device of RAKE reception technique as shown in Figure 1.But traditional single user RAKE receiving system number of users increase with near-far interference under receptivity 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.Document [1] has proposed multi-user's receiving system that number of patent application is a kind of uplink special physical channel of 02151067.9, this device adopts multiuser detection, the signal that the method for simplifying of double-weighing parallel interference cancellation method is applied to uplink special physical channel receives, and has the performance that is higher than traditional single user RAKE receiving system.
What Fig. 2 showed is existing uplink special physical channel multi-user receiving system.As seen from Figure 2, multi-user's receiving system 200 comprises separates mediation matched filter 201, multipath group 205, first order parallel interference cancellation (PIC) structure 202 and afterbody PIC structure 204, also comprises middle PIC structures 203 at different levels.This device at first the received signal of antenna is carried out demodulation and matched filtering obtains baseband signal, and gives multipath group 205 and first order PIC structure 202, middle PIC structures 203 at different levels and afterbody PIC structure 204 simultaneously with baseband signal.
As shown in Figure 2, baseband signal enters the multipath group, and the system of setting up departments has K user, and the multipath group just has K multipath.Each searcher is responsible for searching for a user's footpath time delay information.All users' footpath time delay information is given first order PIC structure 202, middle PIC structures 203 at different levels and afterbody PIC structure 204 simultaneously.
What Fig. 3 showed is the first order PIC structure of existing uplink special physical channel multi-user receiving system.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.Each user's signal processing unit 300 is finished identical function.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.
As shown in Figure 3, subscriber signal processing unit 300 comprises the RAKE merge cells 305 of DPDCH despread unit 301, DPCCH despread unit 302, power control unit 303, channel estimating unit 304, noise power estimation unit 308, DPDCH, RAKE merge cells 307, DPDCH soft-decision and soft-decision weighted units 309, DPCCH soft-decision and soft-decision weighted units 310 and the signal regeneration unit 311 that transformat combination is indicated (TFCI) decoding unit 306, DPCCH.Interference cancellation unit 320 comprises signal summing unit 321, moulding and matched filtering unit 322 and residual computations unit 323.Subscriber signal processing unit 300 through a series of processing, obtains this user's power control instruction, symbol level regenerated signal and chip-level regenerated signal by the baseband signal of input and this user's multidiameter delay information.User's power control instruction feeds back to the subscriber equipment (UE) of transmitting terminal respectively through down link, and UE adjusts uplink transmission power according to power control instruction.User's symbol level regenerated signal is then given the symbol correction subelement in the subscriber signal processing unit of same user in the next stage PIC structure.All users' chip-level regenerated signal and baseband signal enter interference cancellation unit 320, and this unit is handled input signal and obtained residual signals.Residual signals is given next stage PIC structure as the output signal of PIC at the corresponding levels.
What Fig. 4 showed is the intergrade PIC structure of existing uplink special physical channel multi-user receiving system.Intergrade PIC structure 203 still comprises K subscriber signal processing unit 400 and an interference cancellation unit 420.The corresponding subscriber signal processing unit 400 of each user.Each user's subscriber signal processing unit 400 is finished identical function.Intergrade PIC structure 203 also comprises spreading factor computing unit 430.The progression of intergrade PIC structure 203 can be determined as required, can use one or more levels intergrade PIC structure 203, also can not use intergrade PIC structure 203.
As shown in Figure 4, subscriber signal processing unit 400 comprises the RAKE merge cells 407 of DPDCH despread unit 401, DPCCH despread unit 402, channel estimating unit 403, noise power estimation unit 404, symbol amending unit 405, symbol amending unit 406, DPDCH, RAKE merge cells 408, DPDCH soft-decision and soft-decision weighted units 409, DPCCH soft-decision and soft-decision weighted units 410 and the signal regeneration unit 411 of DPCCH.Interference cancellation unit 420 comprises signal summing unit 421, moulding and matched filtering unit 422 and residual computations unit 423.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.Be output as user's symbol level regenerated signal and chip-level regenerated signal.Symbol correction subelement in same user's the signal processing unit in the one-level PIC structure after the symbol level regenerated signal is fed to, the chip-level regenerated signal is admitted to interference cancellation unit 420.Baseband signal also enters the interference cancellation unit.This unit obtains residual signals to all users' chip-level regenerated signal and base band signal process.Residual signals is given next stage PIC structure as the output signal of PIC at the corresponding levels.Other subsequent stages PIC structure treatment process at the corresponding levels is the same.
What Fig. 5 showed is the afterbody PIC structure of existing uplink special physical channel multi-user receiving system.Afterbody PIC structure 204 comprises K subscriber signal processing unit 500, also comprises spreading factor computing unit 510.The corresponding subscriber signal processing unit 500 of each user.Each user's subscriber signal processing unit 500 is finished identical function.As shown in Figure 5, user's signal processing unit 500 comprises the RAKE merge cells 506 of DPDCH despread unit 501, DPCCH despread unit 502, channel estimating unit 503, symbol amending unit 504, symbol amending unit 505, DPDCH, RAKE merge cells 507, channel decoder 508 and the hard decision device 509 of DPCCH.DPDCH treatment channel and DPCCH treatment channel in the residual signals while entering signal processing unit 500 of user's multidiameter delay information and upper level PIC structure.The DPDCH passage carries out the DPDCH despreading earlier to the residual signals of input, then the despreading result is carried out symbol correction, multipath merging.This result is admitted to the channel decoder 508 of DPDCH channel, and the channel decoding obtains the information bit that the DPDCH channel sends.The DPCCH passage carries out the DPCCH despreading earlier to the residual signals of input, then the despreading result is carried out symbol correction, channel estimating, carries out multipath at last and merges.The multipath amalgamation result is fed to the hard decision device 509 of DPCCH channel.509 pairs of input signals of hard decision device carry out hard decision, obtain the information bit that the DPCCH channel sends.
In intergrade PIC structure 203 and afterbody PIC structure 204, the DPDCH despreading need be known the spreading factor of DPDCH, and this spreading factor can use the spreading factor of DPDCH despread unit in the previous stage PIC structure; Also can be according to the spreading factor computing unit, carry out TFCI decoding by the RAKE amalgamation result of DPCCH channel at the corresponding levels and obtain.Wherein the spreading factor computing unit comprises the TFCI decoding unit.
It more than is the signal processing of multi-user's receiving system of uplink special physical channel.The method for simplifying of the double-weighing parallel interference cancellation method that this device adopts is when guaranteeing judgement cost minimum, remedied the deviation of on the statistical significance subscriber signal being estimated by the part interference cancellation, improved performance significantly, and reduced with respect to double-weighing parallel interference cancellation method complexity.
In multi-user's receiving system of above-mentioned uplink special physical channel, only consider the processing procedure of DPDCH channel.When the signal to noise ratio of user's at the corresponding levels RAKE amalgamation result is higher, the soft-decision result that RAKE merges just relatively accurately, user's symbol level regenerated signal and chip-level regenerated signal are just relatively accurately, thereby the performance of interference cancellation at the corresponding levels is just good more, and this makes the performance of next stage PIC also can correspondingly improve.When the signal to noise ratio of user's at the corresponding levels RAKE amalgamation result is hanged down, the soft-decision result's that RAKE merges reliability reduces, user's symbol level and chip-level regenerated signal are just inaccurate, thereby the just reduction of the performance of interference cancellation at the corresponding levels, and this makes the performance of next stage PIC also can correspondingly reduce.Therefore, improve the signal to noise ratio of user RAKE amalgamation result, can improve the performance of multi-user's receiving system.The performance here refers to the demodulation bit error rate of user DPDCH channel.
But the index of weighing the detection performance of user DPDCH channel is the Block Error Rate of user DPDCH channel.Block Error Rate is not only relevant with user's demodulation performance, and is closely related with the decoding depth and the code rate of this user decoder.Just, the Block Error Rate of user DPDCH channel not only depends on the demodulation performance of user DPDCH channel, and depends on the error correcting capability of DPDCH channel decoding method.
For the uplink special physical channel in the WCDMA system, the spreading factor that improves user DPDCH channel can improve the signal to noise ratio of the RAKE amalgamation result of user DPDCH channel.But because WCDMA system transmitting terminal spreading rate is 3.84*10
6Cps is so the coding gain of DPDCH channel and spreading gain sum are determined.When improving spreading gain, coding gain just reduces, and this means that encoder complexity reduces, the decoder error correcting capability descends.Therefore, when improving spreading factor, when making the demodulation performance raising of user DPDCH channel, might not improve the Block Error Rate performance of this user DPDCH channel.
What Fig. 6 showed is the channel coding method of 12.2kbps uplink special physical channel in the existing WCDMA agreement.In 25.212 and 25.104 agreements of 3GPP, stipulated the DPDCH channel coding method of 12.2kbps uplink special physical channel.As shown in Figure 6, in the 12.2kbps uplink special physical channel, DTCH channel and DCCH channel carry out the interpolation of CRC bit, the interpolation of tail bit, 1/3 speed convolutional encoding respectively, interweave for the first time, wireless frame segmentation and rate-matched.Then, the data multiplex of these two channels carries out together that interweave with the second time and time slot dividing.Under this coding method, the spreading factor of DPDCH channel is 64.The block diagram of 1/3 rate convolutional encoder is seen agreement 25.212; Rate-matched adopts even repetitive mode.In this coding method, interweave for the first time, wireless frame segmentation, rate-matched, data multiplex, for the second time interweave and the concrete grammar of time slot dividing referring to agreement 25.212.
Table 1 is the parameter list of the channel coding method of 12.2kbps uplink special physical channel in the existing WCDMA agreement:
| Parameter | Standard | Unit |
| Information bit rate | ????12.2 | ????kbps |
| DPCH (DPCH) | ????60 | ????kbps |
| Power control | Close | |
| Transformat combination indication (TFCI) | Open | |
| Repetition rate | ????22 | ????％ |
In the WCDMA system, the process of UE end transmission information bit in the 12.2kbps uplink special physical channel is the information bit process of transmitting of uplink special physical channel as mentioned above.In process of transmitting, adopt channel coding method as shown in Figure 6 to carry out the coding of DPDCH channel and carry out spread spectrum by 64 pairs of DPDCH channels of spreading factor.
The base station end of WCDMA system adopts above-mentioned multi-user's receiving system to receive the information bit that the UE end sends at the 12.2kbps uplink special physical channel, and receiving course as mentioned above.When DPDCH channel channel-decoding, decode according to the anti-process of cataloged procedure shown in Figure 6.
The channel coding method effect that studies show that 12.2kbps uplink special physical channel in the existing WCDMA agreement that adopts as shown in Figure 6 in multi-user's receiving system is not best, and this channel coding method can also improve.The present invention proposes a kind of channel coding method that the multi-user receives that is used at the 12.2kbps uplink special physical channel, this method is maintained the Multiuser Detection performance and slightly raising when reducing encoder and decoder complexity.
Summary of the invention
The objective of the invention is to provide and be used for the channel coding method that the multi-user receives in a kind of WCDMA system at the 12.2kbps uplink special physical channel, this coding method is improved the spreading factor of user's DPDCH channel, and by using this coding method, multi-user's receiving system is maintained and slightly raising user's the DPDCH channel and the detection performance of DPCCH channel under the situation of encoder and the reduction of decoder complexity.
The present invention realizes that by following method this method may further comprise the steps:
At first to Dedicated Traffic Channel (DTCH) signal and Dedicated Control Channel (DCCH) signal carry out the interpolation of Cyclic Redundancy Check bit, the interpolation of tail bit, 1/2 speed convolutional encoding respectively, interweave for the first time, wireless frame segmentation and rate-matched; Then the DTCH channel signal and the data multiplex of DCCH channel signal are in the same place, carry out that interweave with the second time and time slot dividing, form Dedicated Physical Data Channel (DPDCH) signal.
Wherein 1/2 speed convolutional encoding is according to the predetermined operation in 25.212 agreements of 3GPP.Interweave for the first time, wireless frame segmentation, rate-matched, data multiplex, for the second time interweave and time slot dividing all according to the predetermined operation in 25.212 agreements of 3GPP.Speed matching method in 25.212 agreements of rate-matched employing 3GPP, rate-matched adopts even hole knockout in the method.
By adopting above-mentioned channel coding method to make the spreading factor of DPDCH channel signal is 128.
The present invention has improved the spreading factor of DPDCH channel signal widely by adopting 1/2 speed convolutional encoding, and the present invention improve spreading factor and reduce encoder and the situation of decoder complexity under, the detection performance of multi-user's receiving system be maintained and slightly improve.
Description of drawings
Fig. 1 is existing uplink special physical channel list user RAKE receiving system schematic diagram;
Fig. 2 is existing uplink special physical channel multi-user receiving system schematic diagram;
Fig. 3 is a first order PIC structural representation in the existing uplink special physical channel multi-user receiving system;
Fig. 4 is an intergrade PIC structural representation in the existing uplink special physical channel multi-user receiving system;
Fig. 5 is an afterbody PIC structural representation in the existing uplink special physical channel multi-user receiving system.
Fig. 6 is the schematic diagram of the channel coding method of 12.2kbps uplink special physical channel in the existing WCDMA agreement;
Fig. 7 is the schematic diagram of the spectrum-spreading and scrambling process of 12.2kbps uplink special physical channel in the existing WCDMA agreement;
Fig. 8 is the schematic diagram of the channel coding method of 12.2kbps uplink special physical channel of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Transmitting terminal in the WCDMA system, subscriber equipment (UE) sends information bit according to following process on the 12.2kbps uplink special physical channel:
The information bit of Dedicated Physical Data Channel (DPDCH) carries out chnnel coding earlier, carries out BPSK mapping then, and the spreading factor information that mapping obtains to BPSK of the DPDCH channel that obtains according to chnnel coding is carried out spread spectrum.And the information bit of DPCCH channel directly carries out BPSK mapping and spread spectrum, and spreading factor is 256.What Fig. 7 showed is the schematic diagram of the spectrum-spreading and scrambling process of 12.2kbps uplink special physical channel in the existing WCDMA agreement.As shown in Figure 7, 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.The spread spectrum of uplink special physical channel, scrambling, pulse-shaping and modulator approach are seen 25.213 agreements of 3GPP.
In order to access the spreading factor of higher DPDCH channel, the present invention proposes and be used for the channel coding method that the multi-user receives in a kind of WCDMA system, comprise following steps:
At first under the 12.2kbps DPCH, to Dedicated Traffic Channel (DTCH) signal and Dedicated Control Channel (DCCH) signal carry out the interpolation of Cyclic Redundancy Check bit, the interpolation of tail bit, 1/2 speed convolutional encoding respectively, interweave for the first time, wireless frame segmentation and rate-matched; Then the DTCH channel signal and the data multiplex of DCCH channel signal are in the same place, carry out that interweave with the second time and time slot dividing, form Dedicated Physical Data Channel (DPDCH) signal.
Wherein 1/2 speed convolutional encoding is according to the predetermined operation in 25.212 agreements of 3GPP.Interweave for the first time, wireless frame segmentation, rate-matched, data multiplex, for the second time interweave and time slot dividing all according to the predetermined operation in 25.212 agreements of 3GPP.Speed matching method in 25.212 agreements of rate-matched employing 3GPP specifically adopts even hole knockout.
By adopting above-mentioned channel coding method to make the spreading factor of DPDCH channel signal is 128.
Table 2 is parameter lists of the channel coding method of 12.2kbps uplink special physical channel of the present invention:
| Parameter | Standard | Unit |
| Information bit rate | ????12.2 | ????kbps |
| DPCH (DPCH) | ????30 | ????kbps |
| Power control | Close | |
| Transformat combination indication (TFCI) | Open | |
| Punching rate | ????8.5 | ????％ |
What Fig. 8 showed is the instantiation of realizing the channel coding method of 12.2kbps uplink special physical channel of the present invention.As shown in Figure 8, may further comprise the steps:
A, under the 12.2kbps DPCH, to the DTCH channel signal promptly the information data of the 244 bits CRC bit that carries out 16 bits add the signal that the back forms 260 bits, simultaneously to the DCCH channel signal promptly the information data of the 100 bits CRC bit that carries out 12 bits add the signal that the back forms 112 bits;
The tail bit that the DTCH channel signal of b, 260 bits after the CRC bit added carries out 8 bits adds the signal that forms 268 bits, and the tail bit that the DCCH channel signal of 112 bits after simultaneously the CRC bit being added carries out 8 bits adds the signal that forms 120 bits;
The DTCH channel signal of c, 268 bits after the tail bit added carries out the signal that 1/2 speed convolutional encoding forms 536 bits, and the DCCH channel signal of 120 bits after simultaneously the tail bit being added carries out the signal that 1/2 speed convolutional encoding forms 240 bits;
D, the bit arrangement order that the DTCH channel signal of 536 bits after the 1/2 speed convolutional encoding is carried out interweaving for the first time and promptly changes signal, the bit arrangement order that the DCCH channel signal of 240 bits after the 1/2 speed convolutional encoding is carried out interweaving for the first time and promptly changes signal simultaneously;
E, the DTCH channel signal of 536 bits after interweaving is for the first time carried out wireless frame segmentation form 2 frame signals that size is 268 bits, simultaneously the DCCH channel signal of 240 bits after interweaving is for the first time carried out wireless frame segmentation and form 4 frame signals that size is 60 bits;
F, the every frame sign after adopting even hole knockout to wireless frame segmentation are that 2 frame DTCH channel signals of 268 bits carry out rate-matched, and destroying partial bit, to form corresponding every frame sign be 2 frame signals of 244 bits; Size after adopting even hole knockout to wireless frame segmentation simultaneously is that 4 frame DCCH channel signals of every frame 60 bits carry out rate-matched, destroys partial bit and forms 4 frame signals that every frame sign is 56 bits;
G, the data multiplex of DTCH channel signal after the rate-matched and DCCH channel signal is formed 2 frame signals that size is 300 bits together, carry out interweaving the second time; And 4 frame signals after interweaving are for the second time carried out time slot dividing form Dedicated Physical Data Channel (DPDCH) signal, it is that 20 bits, timeslot number are 15 signal that every frame signal is divided into size.
At the base station of WCDMA system end, adopt as Fig. 2～multi-user's receiving system shown in Figure 5 and receive the information bit that the UE end sends at the 12.2kbps uplink special physical channel, its concrete receiving course is as follows:
As shown in Figure 2, the received signal of antenna obtains baseband signal through separating 201 processing of mediation matched filter, and baseband signal is sent into multipath group 205, first order PIC structure 202 and middle PIC structure 203 at different levels simultaneously.
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.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.
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.
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.
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, 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.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.
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.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.
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.To the 12.2kbps uplink special physical channel, the channel-decoding process is the anti-process of process shown in Figure 8.
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 (5)
1. be used for the channel coding method that the multi-user receives in a Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, it is characterized in that described channel coding method may further comprise the steps:
A, Dedicated Traffic Channel (DTCH) signal and Dedicated Control Channel (DCCH) signal are carried out the Cyclic Redundancy Check bit respectively add;
B, the Dedicated Traffic Channel signal after cyclic redundancy check bits added and Dedicated Control Channel signal carry out the tail bit respectively and add;
C, Dedicated Traffic Channel signal and Dedicated Control Channel signal after the tail bit added carry out 1/2 speed convolutional encoding respectively;
D, Dedicated Traffic Channel signal after the 1/2 speed convolutional encoding and Dedicated Control Channel signal are carried out respectively interweaving the first time;
E, Dedicated Traffic Channel signal and Dedicated Control Channel signal after interweaving are for the first time carried out wireless frame segmentation respectively;
F, Dedicated Traffic Channel signal after the wireless frame segmentation and Dedicated Control Channel signal are carried out rate-matched respectively;
G, the Dedicated Traffic Channel signal after the rate-matched and the data multiplex of Dedicated Control Channel signal are in the same place, carry out that interweave with the second time and time slot dividing, form Dedicated Physical Data Channel (DPDCH) signal.
2. channel coding method as claimed in claim 1, it is further characterized in that described 1/2 speed convolutional encoding is according to the predetermined operation in 25.212 agreements of 3GPP.
3. channel coding method as claimed in claim 1, it is further characterized in that, the described first time of time friendship, wireless frame segmentation, rate-matched, data multiplex, for the second time interweave and time slot dividing all according to the predetermined operation in 25.212 agreements of 3GPP.
4. as claim 1 or 3 described channel coding methods, it is further characterized in that the speed matching method in 25.212 agreements of described rate-matched employing 3GPP specifically adopts even hole knockout.
5. channel coding method as claimed in claim 1, it is further characterized in that the spreading factor of described DPDCH channel signal is 128.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100415036C (en) * | 2004-09-16 | 2008-08-27 | 华为技术有限公司 | Detecting method for upward intensified special channels |
| CN1964204B (en) * | 2006-11-15 | 2010-05-12 | 华为技术有限公司 | A decoding optimization method and device to intensify special physical control channel |
| CN101803208A (en) * | 2007-09-14 | 2010-08-11 | 摩托罗拉公司 | Multi-layer cyclic redundancy check code in the wireless communication system |
| CN101807974A (en) * | 2010-04-07 | 2010-08-18 | 中兴通讯股份有限公司 | System and method for transferring ascending control signals on physical upstream sharing channel |
| CN101536335B (en) * | 2007-01-10 | 2013-03-13 | 三菱电机株式会社 | Communication device |
| WO2014134780A1 (en) * | 2013-03-05 | 2014-09-12 | Qualcomm Incorporated | Apparatus and method for sharing dedicated control channel in wireless communications network |
| CN101449622B (en) * | 2006-05-18 | 2015-03-18 | 高通股份有限公司 | Interlace-based control channel balancing in a wireless communication network |
| CN107888319A (en) * | 2017-11-03 | 2018-04-06 | 国网四川省电力公司电力科学研究院 | Suitable for the variable bit rate communication means of acquisition terminal uplink communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100415036C (en) * | 2004-09-16 | 2008-08-27 | 华为技术有限公司 | Detecting method for upward intensified special channels |
| CN101449622B (en) * | 2006-05-18 | 2015-03-18 | 高通股份有限公司 | Interlace-based control channel balancing in a wireless communication network |
| CN1964204B (en) * | 2006-11-15 | 2010-05-12 | 华为技术有限公司 | A decoding optimization method and device to intensify special physical control channel |
| CN101536335B (en) * | 2007-01-10 | 2013-03-13 | 三菱电机株式会社 | Communication device |
| CN101803208A (en) * | 2007-09-14 | 2010-08-11 | 摩托罗拉公司 | Multi-layer cyclic redundancy check code in the wireless communication system |
| CN101803208B (en) * | 2007-09-14 | 2013-12-25 | 摩托罗拉移动公司 | Multi-layer cyclic redundancy check code in wireless communication system |
| CN101807974A (en) * | 2010-04-07 | 2010-08-18 | 中兴通讯股份有限公司 | System and method for transferring ascending control signals on physical upstream sharing channel |
| WO2011124058A1 (en) * | 2010-04-07 | 2011-10-13 | 中兴通讯股份有限公司 | Method and system for transmitting uplink control signaling on physical uplink shared channel |
| US8649350B2 (en) | 2010-04-07 | 2014-02-11 | Zte Corporation | Method and system for transmitting uplink control signaling on physical uplink shared channel |
| CN101807974B (en) * | 2010-04-07 | 2015-05-20 | 中兴通讯股份有限公司 | System and method for transferring ascending control signals on physical upstream sharing channel |
| WO2014134780A1 (en) * | 2013-03-05 | 2014-09-12 | Qualcomm Incorporated | Apparatus and method for sharing dedicated control channel in wireless communications network |
| CN107888319A (en) * | 2017-11-03 | 2018-04-06 | 国网四川省电力公司电力科学研究院 | Suitable for the variable bit rate communication means of acquisition terminal uplink communication |
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