CN1518256A - Network coding modulation method for multiuser receiving device in WCDMA system - Google Patents
Network coding modulation method for multiuser receiving device in WCDMA system Download PDFInfo
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Abstract
A grid code modulation method for the multi-user receiver in WCDMA system is disclosed, which is provided to the 12.2 kbps dedicated physical up channel, and features the combination of 2/3-rate convolution coding with 8PSK modulation. Its advantage is high effect to increase the spectrum-spreading factor of DPDCH, and improve the decoding performance and the perforamnce of multi-user detection system.
Description
Technical field
The present invention relates to communication system, relate in particular to the multiuser detection of channel coding technology, modulation technique and the base station of uplink special physical channel 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 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.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.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.
More than be that user side in the WCDMA system (UE) buries the process that sends bit on the channel at up special-purpose thing.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.And the double-weighing parallel interference cancellation method that adopts of this device, comprise BPSK modulation double-weighing parallel interference cancellation method and the double-weighing parallel interference cancellation method of MPSK under modulating down, improved performance significantly.
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.Otherwise the performance of interference cancellation at the corresponding levels just reduces, 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.
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 value | 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.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.This paper provides the Trellis-coded modulation method that is used for multi-user's receiving system in a kind of WCDMA system at the 12.2kbps uplink special physical channel.
Trellis-coded modulation is done as a whole consideration to coding and modulation, obtains this whole optimal design.Massey in 1974 is according to Shannon information theory, at first proof: will encode and modulate optimal design when doing as a whole consideration, and can improve the performance of system greatly.Ungeboech and modern well show tree etc. carry out the research of this respect in the later stage seventies, and to propose code check in nineteen eighty-two be that the trellis sign indicating number (convolution code) of k/ (k+1) is mapped as 2
(k+1)Individual modulation signal is concentrated the method for a signal.The method that this coding combines with chopping phase is not increasing the gain that can obtain 3～6dB under bandwidth and the identical information speed.Because modulation signal is a grid code,, note by abridging into TCM (Trellis Coded Modulation) so this system just is called Trellis-coded modulation.
TCM is not only coding and the optimal design of modulation when considering as a whole, can improve the performance of system; And can greatly reduce character rate, improve spreading factor.The present invention introduces it in the code modulating method of 12.2kbps uplink special physical channel, proposes coded modulation new method---the Trellis-coded modulation method of this channel.
Summary of the invention
The objective of the invention is to provides the Trellis-coded modulation method that is used for multi-user's receiving system in a kind of WCDMA system at the 12.2kbps uplink special physical channel, this trellis coded modulation scheme can improve spreading factor greatly, and this trellis coded modulation scheme has very big potentiality at raising decoding performance and raising multi-user detection system aspect of performance.
The present invention realizes that by following method this method may further comprise the steps:
A, under the 12.2kbps uplink special physical channel, Dedicated Traffic Channel (DTCH) and Dedicated Control Channel (DCCH) are earlier carried out the Cyclic Redundancy Check bit to the information sequence of input respectively and are added;
B, the DTCH channel signal after the CRC bit added carry out Trellis-coded modulation to be handled, and obtains I, Q two paths of data; DCCH channel signal after simultaneously the CRC bit being added carries out 1/3 speed convolutional encoding and 8PSK modulation, obtains I, Q two paths of data;
The I circuit-switched data and the Q circuit-switched data of c, the DTCH channel after Trellis-coded modulation handled carries out respectively interweaving first time, wireless frame segmentation and rate-matched, and the I circuit-switched data and the Q circuit-switched data of the DCCH channel after simultaneously 1/3 speed convolutional encoding and 8PSK being modulated carries out respectively interweaving the first time, wireless frame segmentation and rate-matched;
D, carry out together that interweave with the second time and time slot dividing with the I circuit-switched data of the I circuit-switched data of the DTCH channel after the rate-matched and the DCCH channel after the rate-matched is multiplexing, form the I circuit-switched data of DPDCH channel, and carry out together that interweave with the second time and time slot dividing with the Q circuit-switched data of the Q circuit-switched data of the DTCH channel after the rate-matched and the DCCH channel after the rate-matched is multiplexing, form the Q circuit-switched data of DPDCH channel.
Above-mentioned Trellis-coded modulation is handled by 2/3 speed convolutional encoding and 8PSK modulation and is constituted, and carries out earlier carrying out the 8PSK modulation after the 2/3 speed convolutional encoding, and wherein the 8PSK modulation refers to the MPSK modulation of M=8.The 8PSK modulation can be arranged in pairs or groups with 2/3 speed convolutional encoding of different conditions number.
In the Trellis-coded modulation method, 1/3 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 repetitive mode.
To carrying out spread spectrum through the I circuit-switched data and the Q circuit-switched data that obtain described DPDCH channel after the Trellis-coded modulation, spreading factor is 256.Its spread spectrum process is to select arbitrarily two numbers respectively as the sign indicating number of the channel code on DPDCH channel I road and Q road number from 1～255 positive integer, respectively spread spectrum is carried out on DPDCH channel I road and Q circuit-switched data with yard number corresponding two channel code of channel code.
The present invention handles the spreading factor that has not only improved the DPDCH channel greatly by employing by the Trellis-coded modulation that 2/3 speed convolutional encoding and 8PSK modulation constitute, and this trellis coded modulation scheme has very big potentiality at raising decoding performance and raising multi-user detection system aspect of performance.
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 Trellis-coded modulation method of 12.2kbps uplink special physical channel of the present invention;
Fig. 9 is the spectrum-spreading and scrambling process schematic diagram of 12.2kbps uplink special physical channel of the present invention under Trellis-coded modulation;
Figure 10 is that status number is 8 2/3 rate coding device block diagram;
Figure 11 is the performance comparison diagram of 1/3 speed convolutional encoding under TCM of the present invention and the BPSK modulation.
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) earlier according to
Trellis-coded modulation method of the present invention is carried out the chnnel coding modulation, and this Trellis-coded modulation method comprises following steps:
A, under the 12.2kbps uplink special physical channel, Dedicated Traffic Channel (DTCH) and Dedicated Control Channel (DCCH) are earlier carried out the CRC bit to the information sequence of input respectively and are added;
B, the DTCH channel signal after the CRC bit added carry out Trellis-coded modulation to be handled, and the DTCH channel signal after promptly the CRC bit being added carries out 2/3 speed convolutional encoding and 8PSK modulation, obtains I, Q two paths of data; DCCH channel signal after simultaneously the CRC bit being added carries out 1/3 speed convolutional encoding and 8PSK modulation, obtains I, Q two paths of data;
The I circuit-switched data and the Q circuit-switched data of c, the DTCH channel after Trellis-coded modulation handled carries out respectively interweaving first time, wireless frame segmentation and rate-matched, and 1 circuit-switched data and the Q circuit-switched data of the DCCH channel after simultaneously 1/3 speed convolutional encoding and 8PSK being modulated carries out respectively interweaving the first time, wireless frame segmentation and rate-matched;
D, carry out together that interweave with the second time and time slot dividing with the I circuit-switched data of the I circuit-switched data of the DTCH channel after the rate-matched and the DCCH channel after the rate-matched is multiplexing, form the I circuit-switched data of DPDCH channel, and carry out together that interweave with the second time and time slot dividing with the Q circuit-switched data of the Q circuit-switched data of the DTCH channel after the rate-matched and the DCCH channel after the rate-matched is multiplexing, form the Q circuit-switched data of DPDCH channel.
What Fig. 9 showed is the spectrum-spreading and scrambling process of 12.2kbps uplink special physical channel of the present invention under Trellis-coded modulation.Under the Trellis-coded modulation method, the DPDCH channel is according to carrying out spread spectrum as shown in Figure 9, and spreading factor is 256.Concrete spread spectrum process is as follows: from 1～255 positive integer, select two numbers respectively as the sign indicating number of the channel code on DPDCH channel I road and Q road number, with corresponding two channel code respectively to DPDCH channel I road and Q circuit-switched data spread spectrum.And the information bit of DPCCH channel directly carries out BPSK mapping and spread spectrum, and spreading factor is 256.DPDCH channel Q road chip behind the spread spectrum and DPCCH channel chip are superimposed and constitute the Q circuit-switched data of up channel, and the DPDCH channel I road chip behind this circuit-switched data and the spread spectrum carries out scrambling together to be handled.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 the Trellis-coded modulation method, the block diagram of 1/3 rate convolutional encoder is seen agreement 25.212; Rate-matched adopts even repetitive mode; 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.
The 8PSK modulation can combine with 2/3 speed convolutional encoding of different conditions number, and table 2 has provided the several different methods of 2/3 speed convolutional encoding and the combination of 8PSK chopping phase.
| The status number of 2/3 convolutional encoding | The coding gain that 2/3 convolutional encoding combines with the 8PSK chopping phase (with respect to the QPSK modulation of not encoding) |
| 4 | ???3.0 |
| 8 | ???3.6 |
| 16 | ???4.1 |
| 32 | ???4.6 |
| 64 | ???5.0 |
| 128 | ???5.4 |
| 256 | ???5.7 |
Can see from table 2: the 8PSK modulation can combine with 2/3 speed convolutional encoding of different conditions number.Increase along with the coder state number, the performance of the Trellis-coded modulation (TCM) that 8PSK modulation and 2/3 speed convolutional encoding constitute is improving: when status number was 4, the performance of the TCM that 8PSK modulation and 2/3 speed convolutional encoding constitute improved about 3.0dB with respect to the QPSK modulation of not encoding; When status number was 256, the performance of the TCM that 8PSK modulation and 2/3 speed convolutional encoding constitute improved about 5.7dB with respect to the QPSK modulation of not encoding.Along with the increase of 2/3 rate convolutional encoder status number, the complexity of 2/3 rate convolutional encoder and corresponding decoder also correspondingly increases.
Status number be 8 2/3 rate convolutional encoder as shown in figure 10.This coder structure is simple, complexity is very low, and the performance of the TCM that constitutes of it and 8PSK modulation improves about 3.6dB with respect to the QPSK modulation of not encoding.The performance of 1/3 rate convolutional code under the BPSK modulation is more or less the same in this performance and the 3GPP agreement 25.212, as shown in figure 11, curve 1 expression status number is the performance of the TCM that constitutes of 8 2/3 speed convolutional encoding and 8PSK modulation, the performance of curve 2 expressions 1/3 rate convolutional code under the BPSK modulation.Therefore, along with status number increases, the performance of the TCM that 8PSK modulation and 2/3 speed convolutional encoding constitute also will further improve, and surpass the performance of 1/3 rate convolutional code under the BPSK modulation in the 3GPP agreement 25.212.Therefore, Trellis-coded modulation method of the present invention not only can improve spreading factor greatly but also have the very big potentiality that improve self decoding performance, thereby also just has the very big potentiality that improve the multi-user detection system performance.
When realizing Trellis-coded modulation method of the present invention, can be according to coder complexity and performance demands are selected a kind of 2/3 rate convolutional encoder from table 2, perhaps 2/3 rate convolutional encoder of not listing in the employing table 2, as long as 2/3 rate convolutional encoder of using and 8PSK modulation can constitute TCM, just can realize Trellis-coded modulation method of the present invention.To be publishing house of Xian Electronics Science and Technology University published in 1991 2/3 rate convolutional encoder that table 2 is listed " error correcting code one principle and the method " of being write by Wang Xinmei, Xiao Guo town at document [2], and document [3] is that publishing house of Tsing-Hua University has concrete generating mode in " Principle of Communication " of being write by Cao Zhigang, Qian Yasheng of publication in 1992.
What Fig. 8 showed is the instantiation of realizing the lattice encoding 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 the 4M bit adds the signal that forms the 260+4M bit, 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, the 260+4M bit after the tail bit added carries out the signal that 2/3 speed convolutional encoding forms 3 (130+2M) bit, and the DCCH channel signal of 120 bits after simultaneously the tail bit being added carries out the signal that 1/3 speed convolutional encoding forms 360 bits;
D, the DTCH channel signal of 3 (130+2M) bit after the 2/3 speed convolutional encoding is carried out the 8PSK modulation, generate 130+2M complex symbol, this complex sequences also can be regarded the complex signal that is made of the I/Q two paths of data as; Simultaneously 360 bits after the 1/3 speed convolutional encoding are carried out the 8PSK modulation, generate 120 complex symbols, this complex sequences also can be regarded the complex signal that is made of the I/Q two paths of data as;
E, 130+2M the DTCH channel complex symbol sequence that modulation generates to process 8PSK are carried out interweaving for the first time and are promptly changed putting in order of complex signal sequence, and simultaneously 120 DCCH channel complex symbol sequences after the 8PSK modulation being carried out interweaving the first time promptly changes putting in order of complex signal sequence;
F, the DTCH channel signal of 130+2M complex symbol after interweaving is for the first time carried out wireless frame segmentation form size and be 2 frame signals of 65+M complex symbol, simultaneously the DCCH channel signal of 120 complex symbols after interweaving the first time is carried out wireless frame segmentation and form 4 frame signals that size is 30 complex symbols;
G, the every frame sign after adopting even repetitive mode to wireless frame segmentation are that 2 frame DTCH channel signals of 65+M complex symbol carry out rate-matched, and the every frame sign that forms correspondence is 2 frame signals of a complex symbol; Size after adopting even repetitive mode to wireless frame segmentation simultaneously is that 4 frame DCCH channel signals of every frame 30 complex symbols carry out rate-matched, and forming every frame sign is 4 frame signals of b complex symbol;
H, the data multiplex of DTCH channel complex signal after the rate-matched and DCCH channel complex signal is formed size together be 2 frame signals of (a+b) individual symbol, 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 10 bits, timeslot number are 15 complex signal that every frame signal is divided into size.
When employing status number shown in Figure 10 is 8 2/3 rate convolutional encoder, M=1.
Table 3 be 12.2kbps uplink special physical channel of the present invention the Trellis-coded modulation method parameter list:
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.
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.
The despreading of DPDCH despread unit 301 is divided into I, Q two-way.The despreading of I road is that the I path channels sign indicating number and the scrambler of DPDCH channel is long-pending according to the I road 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 I road multi path despreading result is given the RAKE merge cells 305 of DPDCH channel.The despreading of Q road is that the Q path channels sign indicating number and the scrambler of DPDCH channel is long-pending according to the Q road 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 Q road multi path despreading result is given the RAKE merge cells 305 of DPDCH channel.
The RAKE merge cells 305 of DPDCH, be used in conjunction with the channel estimation results of input respectively to the I road of DPDCH and Q road despreading result write to modulation and RAKE merging, and give DPDCH soft-decision and soft-decision weighted units 309 simultaneously I road and Q road amalgamation result.The write to process and the common RAKE merging process of modulation and RAKE merging of I road and Q road is just the same.
DPDCH soft-decision and soft-decision weighted units 309 obtain the soft-decision of each symbol of DPDCH by the estimated result of the I road of DPDCH and Q road RAKE amalgamation result and noise power, carry out the soft-decision weighting then.In DPDCH soft-decision and soft-decision weighting, the I road of DPDCH and Q road RAKE amalgamation result can be regarded complex symbol as, and the calculating of soft-decision is carried out according to double-weighing method under the MPSK modulation in the document [3].The soft-decision result is a plural number, is weighted (weights of weighting are real numbers) again, so the soft-decision weighted results also is a plural number.
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.
Chip-level regenerated signal generative process as shown in Figure 9.
The symbol level regenerated signal of DPDCH channel comprises: I road symbol level regenerated signal and Q road symbol level regenerated signal.Generate the I road symbol level regenerated signal of DPDCH by the real part of the soft-decision weighted results of DPDCH channel, generate the Q road symbol level regenerated signal of DPDCH by the imaginary part of the soft-decision weighted results of DPDCH channel.The generation method is identical when having only one road symbol level regenerated signal with the DPDCH channel, that is: with coding method in the WCDMA agreement under, the symbol level regenerated signal generation method of DPDCH channel is the same in multi-user's receiving system.Just under Trellis-coded modulation, the symbol level regenerated signal is divided into I road symbol level regenerated signal and Q road symbol level regenerated signal.
For the DPCCH channel, generate the symbol level regenerated signal of DPCCH channel by the soft-decision weighted results of DPCCH.
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.
The despreading of DPDCH despread unit 401 is divided into despreading of I road and the despreading of Q road, and the RAKE merge cells 405 that the result gives the DPDCH channel is simultaneously expanded on the I road and the Q road of DPDCH channel.
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 symbol makeover process of the symbol amending unit 405 of DPDCH channel is divided into symbol correction of I road and the symbol correction of Q road.The I road despreading result of DPDCH channel to input carries out the symbol level correction, is about to the symbol level regenerated signal addition that the despreading result in footpath, DPDCH channel I road and I road should the footpaths.The Q road despreading result of DPDCH channel to input carries out the symbol level correction, is about to the symbol level regenerated signal addition that the despreading result in footpath, DPDCH channel Q road and Q road should the footpaths.
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.The RAKE of the RAKE merge cells 407 of DPDCH channel merges and is divided into I road RAKE merging and Q road RAKE merging.
DPDCH soft-decision and soft-decision weighted units 409 are the soft-decision that the estimated result of the I road of DPDCH channel and Q road RAKE amalgamation result and noise power obtains each complex 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.The symbol level regeneration of DPDCH channel is divided into symbol level regeneration of I road and the regeneration of Q road symbol level, and detailed process is described with first order PIC structure.
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 of DPDCH despread unit 501 is divided into despreading of I road and the despreading of Q road, and I road and Q road despreading result is given simultaneously 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 I road and the Q road despreading result of the DPDCH channel of 504 pairs of inputs of symbol amending unit of DPDCH channel carry out the symbol correction respectively, and I road and Q road symbol correction result are given simultaneously the RAKE unit 506 of DPDCH channel.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 the I/Q symbol correction result of DPDCH and DPCCH symbol correction result write to modulation and multipath merging.The I/Q 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.Just for the TCM method, 2/3 speed convolutional encoding and 8PSK modulation are whole best designs, so when decoding, after obtaining the anti-result who interweaves for the first time, directly carry out TCM decoding, promptly carry out the TCM mode and decipher, and concrete interpretation method is seen document [3].TCM detailed process reference literature [2,3].
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 (9)
1. be used for the Trellis-coded modulation method of multi-user's receiving system in a Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, it is characterized in that described method comprises the steps:
A, under the 12.2kbps uplink special physical channel, Dedicated Traffic Channel (DTCH) and Dedicated Control Channel (DCCH) are earlier carried out the Cyclic Redundancy Check bit to the information sequence of input respectively and are added;
B, the DTCH channel signal after the CRC bit added carry out Trellis-coded modulation to be handled, and obtains I, Q two paths of data; DCCH channel signal after simultaneously the CRC bit being added carries out 1/3 speed convolutional encoding and 8PSK modulation, obtains I, Q two paths of data;
The I circuit-switched data and the Q circuit-switched data of c, the DTCH channel after Trellis-coded modulation handled carries out respectively interweaving first time, wireless frame segmentation and rate-matched, and the I circuit-switched data and the Q circuit-switched data of the DCCH channel after simultaneously 1/3 speed convolutional encoding and 8PSK being modulated carries out respectively interweaving the first time, wireless frame segmentation and rate-matched;
D, carry out together that interweave with the second time and time slot dividing with the I circuit-switched data of the I circuit-switched data of the DTCH channel after the rate-matched and the DCCH channel after the rate-matched is multiplexing, form the I circuit-switched data of Dedicated Physical Data Channel (DPDCH), and carry out together that interweave with the second time and time slot dividing with the Q circuit-switched data of the Q circuit-switched data of the DTCH channel after the rate-matched and the DCCH channel after the rate-matched is multiplexing, form the Q circuit-switched data of DPDCH channel.
2. Trellis-coded modulation method as claimed in claim 1, it is further characterized in that described Trellis-coded modulation is handled by 2/3 speed convolutional encoding and 8PSK modulation and constituted, and carries out earlier carrying out the 8PSK modulation after the 2/3 speed convolutional encoding.
3. Trellis-coded modulation method as claimed in claim 1 or 2, it is further characterized in that described 8PSK modulation refers to the MPSK modulation of M=8.
4. Trellis-coded modulation method as claimed in claim 2, it is further characterized in that the 8PSK modulation can be arranged in pairs or groups with 2/3 speed convolutional encoding of different conditions number.
5. Trellis-coded modulation method as claimed in claim 1, it is further characterized in that, interweave the described 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.
6. as claim 1 or 5 described Trellis-coded modulation methods, it is further characterized in that the speed matching method in 25.212 agreements of described rate-matched employing 3GPP specifically adopts even repetitive mode.
7. Trellis-coded modulation method as claimed in claim 1, it is further characterized in that described 1/3 speed convolutional encoding is according to the predetermined operation in 25.212 agreements of 3GPP.
8. Trellis-coded modulation method as claimed in claim 1, it is further characterized in that to carrying out spread spectrum through the I circuit-switched data and the Q circuit-switched data that obtain described DPDCH channel after the Trellis-coded modulation, spreading factor is 256.
9. Trellis-coded modulation method as claimed in claim 8, it is further characterized in that, described spread spectrum process is to select arbitrarily two numbers respectively as the sign indicating number of the channel code on DPDCH channel I road and Q road number from 1～255 positive integer, respectively spread spectrum is carried out on DPDCH channel I road and Q circuit-switched data with yard number corresponding two channel code of channel code.
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Cited By (9)
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| WO2009006812A1 (en) * | 2007-07-10 | 2009-01-15 | Huawei Technologies Co., Ltd. | Encoding modulation method,decoding method and apparatus of trellis coded modulation code |
| CN101352083A (en) * | 2005-10-27 | 2009-01-21 | 高通股份有限公司 | Method and apparatus of assigning selected interlace mode in wireless communication systems |
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| CN1917410B (en) * | 2005-08-19 | 2010-12-29 | 北京信威通信技术股份有限公司 | Method for encoding and modulating channel inn SCDMA system |
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| CN1917410B (en) * | 2005-08-19 | 2010-12-29 | 北京信威通信技术股份有限公司 | Method for encoding and modulating channel inn SCDMA system |
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| CN101352083B (en) * | 2005-10-27 | 2012-12-26 | 高通股份有限公司 | Method and apparatus of assigning selected interlace mode in wireless communication systems |
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| CN106464426A (en) * | 2014-07-04 | 2017-02-22 | 华为技术有限公司 | Tcm transmitter and receiver devices and methods thereof |
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