CN101488775B - Space multiplexing method and apparatus in TD-SCDMA system - Google Patents

Space multiplexing method and apparatus in TD-SCDMA system Download PDF

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CN101488775B
CN101488775B CN 200810065083 CN200810065083A CN101488775B CN 101488775 B CN101488775 B CN 101488775B CN 200810065083 CN200810065083 CN 200810065083 CN 200810065083 A CN200810065083 A CN 200810065083A CN 101488775 B CN101488775 B CN 101488775B
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CN101488775A (en
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张婷
李斌
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ZTE Corp
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Abstract

The invention relates to a space reuse method in a TD-SCDMA system. The method is as follows: a high-speed data stream is converted into a plurality of paralleling low speed data streams at a transmitting terminal by serial-parallel conversion; after channel coding, spread spectrum and modulation, the layered space-time code is carried out on the low speed data streams, and then the treated low speed data streams are simultaneously transmitted on a plurality of sending antennas; correspondingly, the layered space-time decoding is carried out on receiving signals at a receiving end according to the estimation value of channels. The invention further provides a device for realizing the method. Compared with prior art, the invention not only effectively increases the data rate of a TD-SCDMA system, avoids the inversion process of a large matrix needing to be carried out when the joint detection is directly carried out, reduces the complexity and effectively increases the data transmission rate and frequency spectrum utilization.

Description

Method for spacial multiplex and device in a kind of TD-SCDMA system
Technical field
The present invention relates to communication field, relate in particular to a kind of in the TD-SCDMA system space multiplexing method and device.
Background technology
TD-SCDMA is the 3G (Third Generation) Moblie standard, the TD-SCDMA system has adopted a series of new and high technologies such as uplink synchronous, smart antenna, joint-detection, baton handover, software radio, has the higher availability of frequency spectrum and lower cost than other 3G (Third Generation) Moblie standards.But along with society and economic continuous fast development, number of mobile users will further increase, and mobile multi-media service also can get more and more, and the transmission rate of 3-G (Generation Three mobile communication system) can not meet the demands.
Multiple-input and multiple-output (Multi-input Multi-output, MIMO) technology can significantly improve the availability of frequency spectrum of wireless system, and then the transmission rate of raising data, MIMO has become future mobile communication system and has realized high data rate, this technology has just been used in the important channel of high-transmission quality in the existing TD-SCDMA system.As shown in Figure 1, be transmitting terminal structural representation in the existing TD-SCDMA system, be example to have 2 transmitting antennas, its workflow is as follows:
Step 101: transmitting terminal is divided into 2 tunnel parallel low speed sub data flows independently with high-speed data-flow to be sent by string and conversion;
Step 102: all sub data flows are carried out chnnel coding, spread spectrum, modulation operations respectively;
Step 103: in each way data flow, add frequency pilot sign respectively, form subframe;
Step 104: 2 way data flow after the framing are sent simultaneously via 2 transmitting antennas respectively.
As shown in Figure 2, be receiving terminal structural representation in the existing TD-SCDMA system, be example to have 2 reception antennas also, its workflow is as follows:
Step 201: receive with 2 reception antennas, and the signal that receives on 2 reception antennas is sent into channel estimation module current channel is estimated;
Step 202: channel estimation value and two-way are received signal send into the joint-detection module and carry out joint-detection;
Step 203: the 2 way data flow that the associating detection module obtains are carried out demodulation, channel decoding operation respectively;
Step 204: 2 way data flow are carried out parallel serial conversion obtain original data stream.
Said method receives signal to two-way and directly carries out joint-detection, need carry out the inversion process of large matrix, complexity is higher, demixing time space among the MIMO (Bell-labs Layered Space Time, BLAST) technology is the effective ways that are used for improving transmission of radio links speed and the availability of frequency spectrum that proposed by Bell Laboratory, this technology is by adopting many antennas respectively at transmitting terminal and receiving terminal, take full advantage of the spatial domain resource spatial multiplexing gain is provided, thereby improve message transmission rate and the availability of frequency spectrum.
Summary of the invention
Technical problem to be solved by this invention is, method for spacial multiplex in a kind of TD-SCDMA system is provided, this method not only effectively improves the data rate of TD-SCDMA system, and need carry out the inversion process of large matrix when having avoided directly carrying out joint-detection, has reduced complexity; The present invention also further provides a kind of device of realizing this method.
Method for spacial multiplex in the TD-SCDMA system of the present invention, be included in transmitting terminal, high-speed data to be sent is flowed through and is divided into independently parallel low speed sub data flow of N road behind the serial to parallel conversion, each sub data flow channel coding, spread spectrum, modulation and add frequency pilot sign then, be it and add training sequence, form subframe, launched by the transmitting terminal antenna; Described chnnel coding adopts the 1/3Turbo coding; The receiving terminal antenna receive the low speed sub data flow by channel estimating, joint-detection, demodulation, channel decoding and parallel serial conversion after, obtain original high-speed data-flow; When carrying out channel estimating, simulated channel adopts additive white Gaussian noise (AWGN) channel, every time slot carries out channel estimating one time, obtain many group channel estimation values, get the maximum diameter of respectively organizing in the channel estimation value respectively and form channel transfer matrix, after sub data flow is carried out chnnel coding, spread spectrum, modulation operations, transmitting terminal adds before the frequency pilot sign, also comprise sub data flow is carried out the BLAST coding, and comprise also that after the receiving terminal channel estimating N way data flow that receives is carried out BLAST to be deciphered; The ordering counteracting serial interference method based on minimum mean square error criterion was adopted in decoding when described layering was empty, and the current channel transfer matrix that estimates is handled, and to obtain the ZF vector of each subsignal, utilized the ZF vector to handle receiving data then.
The value of described N equals the transmitting terminal antenna number.
It is that 16 orthogonal variable spreading code carries out spread spectrum that described spread spectrum adopts spreading factor.
Quarternary phase-shift keying (QPSK) (QPSK) modulation is adopted in described modulation.
Described BLAST coding adopts vertical demixing time space (V-BLAST) technology that input signal is encoded.
Described joint-detection adopts MMSE linear block balance method.
Spatial reuse device in the TD-SCDMA of the present invention system, transmitting terminal comprises signal source module, string and modular converter, channel coding module, band spectrum modulation module, insertion frequency pilot sign module and the Anneta module that connects successively, and the signal that signal source module produces is successively through being launched by Anneta module after string and modular converter, channel coding module, band spectrum modulation module and the insertion frequency pilot sign resume module; Described channel coding module adopts the 1/3Turbo coding; Described insertion frequency pilot sign module is it and adds training sequence for adding frequency pilot sign through the signal after described string and modular converter, channel coding module, the band spectrum modulation resume module, forms subframe; Receiving terminal comprises Anneta module, channel estimation module, joint-detection module, demodulation module, channel decoding module and the parallel serial conversion module that connects successively, the Anneta module of receiving terminal receives the processing of passing through channel estimation module, joint-detection module, demodulation module, channel decoding module and parallel serial conversion module behind the signal successively, obtains original signal; When channel estimation module carries out channel estimating, simulated channel adopts additive white Gaussian noise (AWGN) channel, every time slot carries out channel estimating one time, obtain many group channel estimation values, get the maximum diameter of respectively organizing in the channel estimation value respectively and form channel transfer matrix, described transmitting terminal also comprises a BLAST coding module between band spectrum modulation module and insertion frequency pilot sign module, this module is used for the signal of process is carried out the BLAST coding; Described receiving terminal also comprises a BLAST detection module between Anneta module and joint-detection module, this module also links to each other with channel estimation module, is used for sub data flow is carried out BLAST decoding; The demixing time space detection module adopts based on the continuous Interference Cancellation detection algorithm of the ordering of minimum mean square error criterion, the channel transfer matrix that current channel estimation module estimates is handled, to obtain the ZF vector of each subsignal, utilize the ZF vector to handle receiving data then.
The present invention introduces the BLAST technology in the TD-SCDMA system, namely by serial to parallel conversion high-speed data-flow is converted to some parallel low rate data streams at transmitting terminal, after chnnel coding, spread spectrum, modulation, also to carry out the BLAST coding to it, just from many transmit antennas, send simultaneously then, accordingly, carry out BLAST decoding at receiving terminal to the received signal according to channel estimation value; Compared with prior art, the present invention effectively raises message transmission rate and the availability of frequency spectrum.
Description of drawings
Fig. 1 is transmitting terminal schematic diagram of the prior art;
Fig. 2 is receiving terminal schematic diagram of the prior art;
Fig. 3 is transmitting terminal schematic diagram of the present invention;
Fig. 4 is receiving terminal schematic diagram of the present invention.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme.
Method for spacial multiplex in a kind of TD-SCDMA of the present invention system, mainly comprise steps such as serial to parallel conversion, chnnel coding, spread spectrum, modulation, BLAST coding, channel estimating, BLAST detection, joint-detection, demodulation, channel decoding, parallel serial conversion, the present embodiment hypothesis is used 2 transmitting antennas, 2 reception antennas; Chnnel coding adopts the 1/3Turbo coding, the data modulation system adopts the QPSK modulation, it is that 16 orthogonal variable spreading code carries out spread spectrum that spread spectrum adopts spreading factor, receiving terminal adopts based on MMSE ordering counteracting serial interference algorithm and carries out the BLAST detection, adopts MMSE linear block balance method to carry out joint-detection.
As shown in Figure 3, be transmitting terminal schematic diagram of the present invention, concrete treatment step is as follows:
Step 301 is converted to 2 tunnel parallel low speed sub data flows independently with high-speed data bit stream to be sent by string and modular converter;
Step 302 is carried out chnnel coding, spread spectrum, modulation operations respectively to the 2 way data flow that step 301 obtains;
Step 303 is sent the 2 way data flow that step 302 obtains into the BLAST processing module;
If as follows through 2 way data flow after the band spectrum modulation:
The 1 road signal: ... c71c61c51c41c31c21c11c01
The 2 road signal: ... c72c62c52c42c32c22c12c02
The BLAST coding module adopts the V-BLAST technology that input signal is encoded, and through the output signal behind the V-BLAST coding is:
C62c61c42c41c22c21c02c01 is to transmitting antenna 1
C72c71c52c51c32c31c12c11 is to transmitting antenna 2
Step 304 is sent the 32 way data flow that step 303 obtains into adding frequency pilot sign module respectively, is that it adds training sequence and protection interval, forms subframe;
Step 305 sends 2 way data flow after the framing via 2 transmitting antennas respectively simultaneously.
As shown in Figure 4, be receiving terminal schematic diagram of the present invention, the concrete treatment step of receiving terminal is as follows:
Step 401 uses 2 reception antennas to receive signal, comprises useful data and noise through wireless channel in the data flow that each antenna receives, and receiving signal can be expressed as:
r＝Ha+v
Wherein H = h 11 h 12 h 21 h 22 Be channel transfer matrix, each element h in the matrix IjRepresent that the j transmit antennas is to the channel transfer characteristic of i root reception antenna; A=(a 1, a 2) TBe the column vector that transmits, v is white complex gaussian noise; R=(r 1, r 2) TIt is the signal that receives on two reception antennas.
The signal that receives on 2 antennas is sent into channel estimation module current channel is estimated, obtain channel estimation value, suppose that this user is mid at the training sequence that n transmitting antenna uses n, the channel impulse response of the n transmit antennas of m root reception antenna correspondence is h Mn, then the part of corresponding training sequence can be expressed as in the signal that receives on the m root reception antenna:
e mid m = Σ n = 1 2 h mn mid n + v mid m Or e Mid=GH+v Mid
Wherein: G=(G I, j), i=1 ..., W, j=1 ..., W, W are the length of channel impulse response,
Figure GSB00001090982500052
By the top estimated value that namely obtains channel impulse response h be:
H ^ = G - 1 e mid
Owing to when carrying out channel estimating, ignored The noise, should select when therefore selecting training sequence noise robustness good code character.Simulated channel adopts awgn channel, and every time slot carries out channel estimating one time, obtains 4 groups of channel estimation values, gets the maximum diameter of respectively organizing in the channel estimation value respectively and forms channel transfer matrix for the BLAST detection;
Step 402 receives signals with channel estimation value and 2 and sends into the BLAST detection module and decipher, and detecting the data that every transmitting antenna sends, thereby obtains 2 road signals;
The BLAST detection module adopts based on the continuous Interference Cancellation detection algorithm of the ordering of MMSE criterion, the channel matrix that current channel estimation module estimates is handled, to obtain the ZF vector of each subsignal, utilize the ZF vector to handle receiving data then.
Step 403 will be sent into the joint-detection module through 2 road signals that BLAST decoding obtains and carry out joint-detection respectively;
Step 404 is carried out data demodulates, channel decoding operation respectively to 2 road signals;
Step 405 is carried out parallel serial conversion to 2 circuit-switched data streams and is obtained original data stream.
Decoding algorithm concrete steps when BLAST detects are as follows:
Steps A, the current channel matrix that estimates according to channel estimation module
Figure GSB00001090982500054
Calculate G i:
G i = ( H ^ i H H ^ i + σ 2 I ) - 1 H ^ i H
Wherein () HThe operation of expression conjugate transpose, () -1The representing matrix operation of inverting, i represents iteration sequence number, σ 2The expression noise variance is then according to G iSelect the transmitting antenna k of signal to noise ratio maximum i
Step B, the transmitting antenna k of calculating signal to noise ratio maximum iCorresponding ZF vector
Figure GSB00001090982500056
Step C is to transmitting antenna k iOn data carry out ZF decoding, with the ZF vector with receive signal phasor and multiply each other, and decoded data are carried out the planisphere mapping:
y k i = w k i T r i
a ^ k i = Q ( y k i )
Wherein It is right to represent Carry out decision operation;
Step D, eliminate the influence of decoded stream from receive signal phasor:
r i + 1 = r i - a ^ k i ( H ^ i ) k i
Thereby the reception vector r that obtains upgrading i+ 1 and channel matrix
Figure GSB00001090982500066
Wherein
Figure GSB00001090982500067
Expression is got
Figure GSB00001090982500068
K iRow;
Step e, repeating step A～D is up to i=N.
Above-mentioned description at preferred embodiment of the present invention is comparatively concrete, can not therefore think the restriction to scope of patent protection of the present invention, and scope of patent protection of the present invention should be as the criterion with claims.

Claims (7)

1. the method for spacial multiplex in the TD-SCDMA system, be included in transmitting terminal, high-speed data to be sent is flowed through and is divided into independently parallel low speed sub data flow of N road behind the serial to parallel conversion, each sub data flow channel coding, spread spectrum, modulation and add frequency pilot sign then, be it and add training sequence, form subframe, launched by the transmitting terminal antenna; Described chnnel coding adopts the 1/3Turbo coding; The receiving terminal antenna receive sub data flow by channel estimating, joint-detection, demodulation, channel decoding and parallel serial conversion after, obtain original high-speed data-flow; When carrying out channel estimating, simulated channel adopts additive white Gaussian noise (AWGN) channel, every time slot carries out channel estimating one time, obtain many group channel estimation values, get the maximum diameter of respectively organizing in the channel estimation value respectively and form channel transfer matrix, it is characterized in that, after sub data flow is carried out chnnel coding, spread spectrum, modulation operations, transmitting terminal adds before the frequency pilot sign, also comprise sub data flow is carried out demixing time space, and after the receiving terminal channel estimating, also comprise the N way data flow that receives is carried out layering decoding when empty; The ordering counteracting serial interference method based on minimum mean square error criterion was adopted in decoding when described layering was empty, and the current channel transfer matrix that estimates is handled, and to obtain the ZF vector of each subsignal, utilized the ZF vector to handle receiving data then.
2. the method for spacial multiplex in the TD-SCDMA as claimed in claim 1 system is characterized in that the value of described N equals the transmitting terminal antenna number.
3. the method for spacial multiplex in the TD-SCDMA as claimed in claim 1 system is characterized in that, it is that 16 orthogonal variable spreading code carries out spread spectrum that described spread spectrum adopts spreading factor.
4. the method for spacial multiplex in the TD-SCDMA as claimed in claim 1 system is characterized in that, the quarternary phase-shift keying (QPSK) modulation is adopted in described modulation.
5. the method for spacial multiplex in the TD-SCDMA as claimed in claim 1 system is characterized in that, described demixing time space adopts the vertical demixing time space technology that input signal is encoded.
6. the method for spacial multiplex in the TD-SCDMA as claimed in claim 1 system is characterized in that, described joint-detection adopts minimum Mean Square Error Linear block balance method.
7. the spatial reuse device in the TD-SCDMA system, transmitting terminal comprises signal source module, string and modular converter, channel coding module, band spectrum modulation module, insertion frequency pilot sign module and the Anneta module that connects successively, and the signal that signal source module produces is successively through being launched by Anneta module after string and modular converter, channel coding module, band spectrum modulation module and the insertion frequency pilot sign resume module; Described channel coding module adopts the 1/3Turbo coding; Described insertion frequency pilot sign module is it and adds training sequence for adding frequency pilot sign through the signal after described string and modular converter, channel coding module, the band spectrum modulation resume module, forms subframe; Receiving terminal comprises Anneta module, channel estimation module, joint-detection module, demodulation module, channel decoding module and the parallel serial conversion module that connects successively, the Anneta module of receiving terminal receives the processing of passing through channel estimation module, joint-detection module, demodulation module, channel decoding module and parallel serial conversion module behind the signal successively, obtains original signal; When channel estimation module carries out channel estimating, simulated channel adopts additive white Gaussian noise (AWGN) channel, every time slot carries out channel estimating one time, obtain many group channel estimation values, get the maximum diameter of respectively organizing in the channel estimation value respectively and form channel transfer matrix, it is characterized in that described transmitting terminal also comprises a demixing time space module between band spectrum modulation module and insertion frequency pilot sign module, this module is used for the signal of process is carried out demixing time space; Described receiving terminal also comprises a demixing time space detection module between Anneta module and joint-detection module, this module links to each other with channel estimation module simultaneously; The demixing time space detection module adopts based on the continuous Interference Cancellation detection algorithm of the ordering of minimum mean square error criterion, the channel transfer matrix that current channel estimation module estimates is handled, to obtain the ZF vector of each subsignal, utilize the ZF vector to handle receiving data then.
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CN102026383B (en) * 2010-12-07 2013-07-24 大唐移动通信设备有限公司 Resource layering method and device of spatial division multiple access system
CN102271007B (en) * 2011-02-18 2014-02-26 北京大学 Joint detection method and device of multi-speed TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system
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CN108496310B (en) * 2016-07-20 2021-01-29 华为技术有限公司 Signal decoding method, device and equipment
CN110336644B (en) * 2019-07-15 2020-12-15 杭州泽铭睿股权投资有限公司 Layered coding method under high-dimensional modulation

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CN1656726A (en) * 2002-04-05 2005-08-17 北方电讯网络有限公司 Method and communication device using adaptive space-time encoding, modulation and error coding
CN1691539A (en) * 2004-04-30 2005-11-02 皇家飞利浦电子股份有限公司 Universal MIMO combined detecting method and apparatus for MIMO wireless communication system

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Publication number Priority date Publication date Assignee Title
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CN1691539A (en) * 2004-04-30 2005-11-02 皇家飞利浦电子股份有限公司 Universal MIMO combined detecting method and apparatus for MIMO wireless communication system

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