CN1555606A - Encoding method and apparatus involving concatenation of Turbo product code and time-space block code - Google Patents

Encoding method and apparatus involving concatenation of Turbo product code and time-space block code Download PDF

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CN1555606A
CN1555606A CNA028181190A CN02818119A CN1555606A CN 1555606 A CN1555606 A CN 1555606A CN A028181190 A CNA028181190 A CN A028181190A CN 02818119 A CN02818119 A CN 02818119A CN 1555606 A CN1555606 A CN 1555606A
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code
symbol
bit
antenna
block code
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轶 李
李轶
李永会
张永生
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Linkair Communications Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0065—Serial concatenated codes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
    • H03M13/2957—Turbo codes and decoding
    • H03M13/296—Particular turbo code structure
    • H03M13/2963—Turbo-block codes, i.e. turbo codes based on block codes, e.g. turbo decoding of product codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0066—Parallel concatenated codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0643—Properties of the code block codes

Abstract

The present invention relates to a coding method and apparatus involving the concatenation of Turbo Product Code and Time-space Block Code, which comprises: a signal is encoded by using the concatenation of Turbo product code and Time-space block code at a transmitter; and a received signalis decoded at a receiver. This invention reduces the complexity and delay of the decoding, decreases the expense of the buffer, it adopts with the iterated decoding between Turbo produict code and Time-space block code, obtain diversity gains as well as increased the coding gain.

Description

Encoding method and apparatus involving concatenation of Turbo product code and time-space block code
Coding method and device of a kind of Turbo product codes with space-time block code cascade
Technical field
The present invention relates to communication technical field, more particularly to the space-time code method and dress for communication system
5 put, and are concretely a kind of Turbo product codes（) and space-time block code TPC（STBC) coding method of cascade and device.Background technology
It is well known that in fading channel, the decline of signal is by the performance of severe exacerbation system.It is to use diversity technique to overcome the maximally effective means of decline.Space-time coding techniques[1'2' 3]Diversity can be obtained simultaneously and increases θ benefits and coding gain, overcome the influence of decline, improved the reliability of transmission.
In recent years, space-time code is combined with channel error correction encoding and attracted attention, both effective combinations can make system obtain diversity gain, and extra coding gain can also be obtained while coding gain,：So as to greatly improve the anti fading performance and error-correcting performance of system.
Existing system mostly uses convolutional code[4]Or Turbo code[5]And the combination of Space-time code, the decoding complexity of these cases of side 15 is too high, there is certain difficulty in practical application, and be iterated not between channel error correction encoding and Space-time code decoding, it is impossible to obtain sufficiently large coding gain.The content of the invention
It is an object of the present invention to provide coding method and device of a kind of Turbo product codes with space-time block code cascade, this method and device are using TPC as outer code, with space-time block code[1' 2]For the case of cascade side 20 of ISN, LOG- MAP decoding algorithm of the space-time block code in bit-level is given, and give the algorithm that decoding is iterated between the empty block codes of TPC and #.The outer code encoded using TPC as cascade, P striven low decoding complexity and decoding delay, reduce the expense that Slow is deposited, using the iterative decoding between Turbo product codes and space-time block code,
Coding gain is also substantially increased while diversity gain is obtained.
25 ' the technical scheme is that：The invention provides a kind of Turbo product codes and space-time block code The coding method of cascade, including：Transmitting terminal is encoded using the cascade of Turbo product codes and space-time block code；Receiving terminal enters row decoding to the signal of reception.
Described transmitting terminal fork-like farm tool used in ancient China carries out coding with the cascade of Turbo product codes and space-time block code and referred to：The bit of input is carried out Turbo product code codings by transmitting terminal, bit after coding is interleaved, bits switch after intertexture is modulated into symbol to described symbol, and the symbol after modulation is launched according to the rule of space-time block code from multiple transmitting antennas.
Described receiving terminal enters row decoding to the signal of reception and referred to：Receiving terminal enters row decoding to the signal of reception using the cascade of Turbo product codes and space-time block code, it is described be decoded as Turbo product codes and when empty point of Group code between iterative decoding.
Described method, Qi Bu Sudden include：
One reception antenna of two emitting antennas can be used, and using QPSK modulation；
TPC is encoded and the bits switch after interweaving is into symbol；
These symbols are modulated, two after modulation continuous symbol can be designated as x2, in a symbol period, x2Launch simultaneously from antenna 1 and antenna 2 respectively, in next symbol period ,-^2Launch simultaneously from antenna 1 and antenna 2 respectively with ￡;
Wherein：T is may be provided in, the channel fading between transmitting antenna 1 and reception antenna is ^ (t), the channel fading between transmitting antenna 2 and reception antenna is h2(t) signal that, reception antenna is received is r (t), receives signal and is disturbed by white Gaussian noise, and the bilateral power spectral density of noise is σ2 =Ν0/2 ；So have：
r (t) = hj l x! + h2 (t) x2 + vt
r(t+T) = h t+T)(—x; ) + h2(t+T) x; + vt+T
Described method, its step includes：
Receiving terminal obtains bit b by space-time block code decodingl b2, b3, b4Soft Inform ation；
Resulting Soft Inform ation as Turbo product code decoders input Soft Inform ation；
The output of Turbo products code decoder feeds back to space-time block code decoding, using the prior information decoded as space-time block code, is so iterated decoding. Described method, its step further comprises：
One reception antenna of two emitting antennas can be used, and using QPSK modulation；
Input bit is first subjected to Turbo product code codings；
Bit after coding is interleaved；
Bit after intertexture carries out the block code of 1/2 code check（It is designated as BC21) coding；
Bits switch after coding is into symbol；
These symbols are modulated；
Symbol after modulation is launched after serioparallel exchange from multiple transmitting antennas.
Described method, its step can also further comprise：
Receiving terminal calculates bit b by reception signal r (t), r (t+T)l5 b2, b3, b4Soft Inform ation；The calculating of the Soft Inform ation can use many algorithms, can at least use the LOG- MAP algorithms of bit-level；Calculate obtained Soft Inform ation and carry out Turbo product code decodings；
BC21 can be given as prior information after the Soft Inform ation of Turbo product codes decoding output is interleaved and enters decoding；
The decoding of Turbo product codes is also the process of an iterative decoding in itself, and the iterations of Turbo product codes decoding itself is designated as i ter-tpc, and Turbo product codes, which are decoded the iterations between BC21 decodings, is designated as i ter-out;The two iterationses can be selected flexibly, it is considered that selection i ter-tpc is better equal to 2 effects.
Described method, its step more specifically includes：
One reception antenna of two emitting antennas can be used, and using QPSK modulation；
Input bit is first subjected to Turbo product code codings；
Bit after coding is interleaved；
Bit after intertexture carries out the block code coding of 1/2 code check；
Bits switch after coding is into symbol；
These symbols are modulated, four after modulation continuous symbol can be designated asXl、 x2、 x3, x4, in a symbol period, and x2Launch simultaneously from antenna 1 and antenna 2 respectively, next In individual symbol period,
Figure IMGF000006_0001
Launch simultaneously from antenna 1 and antenna 2 respectively；Wherein：T is may be provided in, the channel fading between transmitting antenna 1 and reception antenna is h t), the channel fading between transmitting antenna 2 and reception antenna is h2(t) signal that, reception antenna is received is r (t), receives signal and is disturbed by white Gaussian noise, the bilateral power spectral density of noise is；So have： r (t) = h1 (t) x1 + h2 (t) x2 + vt
r(t+T) -t^t+TX-x; ) + h2(t+T)x;+vt+x；Receiving terminal calculates bit b by reception signal r (t), r (t+T)2, b3, b4Soft Inform ation；
The calculating of the Soft Inform ation can use many algorithms, can at least use a kind of LOG- MAP algorithms of bit-level；Calculate obtained Soft Inform ation and carry out Turbo product code decodings；
BC21, which can be given, after the Soft Inform ation of Turbo product codes decoding output is interleaved as prior information enters row decoding；
The decoding of Turbo product codes is also the process of an iterative decoding in itself, and the iterations of Turbo product codes decoding itself is designated as i ter-tpc, and Turbo product codes, which are decoded the iterations between BC21 decodings, is designated as i ter_out;The two iterationses can be selected flexibly, it is considered that it is better that selection iter.tpc is equal to 2 effects.
The block code coding of 1/2 described code check need to meet following condition：
Figure IMGF000006_0002
Wherein： DBC21 = (d!, ... , d8). b = (bl5b2,b3,b4)
Figure IMGF000006_0003
e = (0 0 0 0 0 1 1 0)。
Described uses one reception antenna of two emitting antennas, can be extended to the multiple reception antennas of multiple transmitting antennas, and described use QPSK modulation can be extended to other modulation.
Wherein：When using N number of transmitting antenna, the block code coding of 1/2 described code check can be encoded by the block code of 1/N code checks to be replaced, i.e.,：BC21 can be replaced by BCN1； . Present invention also offers a kind of Turbo product codes and the code device of space-time block code cascade, wherein：Transmitting terminal at least includes Turbo product code encoders, Shi Kong Fen Group code coders；By by described Turbo product code encoders and space-time block code encoder cascade, being encoded to input bit；Receiving terminal at least include Turbo products code decoder, when empty point of Group code decoder；By the way that by described Turbo products code decoder and space-time block code decoder cascade, row decoding is entered to the signal of reception.
Described device, it is characterised in that：Transmitting terminal also includes interleaver, the conversion equipment and modulator of bit to symbol；
Transmitting terminal cascade is encoded after bit input bit to the conversion equipment of symbol, the symbol input modulator being converted into, the symbol after modulation be sent to after serioparallel exchange on multiple transmitting antennas launch.
=described device, it is characterised in that：The Turbo products code decoder and space-time block code decoder of receiving terminal are in the form of cascade, and composition can be iterated the code translator of decoding.
Effect of the invention is that, by providing coding method and device of a kind of Turbo product codes with space-time block code cascade, reduce the complexity and decoding delay of decoding, reduce the expense that Slow is deposited, the iterative decoding between Turbo product codes and space-time block code is employed, coding gain is also substantially increased while diversity gain is obtained.
Brief description of the drawings
Fig. 1 is the cascade coding structure block diagram using one reception antenna of two emitting antennas and QPSK the Turbo product codes modulated and space-time block code；
Fig. 2 is space-time block code coding structure block diagram；
Fig. 3 is the space-time block code coding structure block diagram of 1/2 code check；
Fig. 4 is the cascade coding structure block diagram using one reception antenna of two emitting antennas and QPSK the Turbo product codes and 1/Z code check space-time block codes modulated；
Fig. 5 is the iterative decoding structured flowchart of Turbo product codes and space-time block code cascade；Fig. 6 is the iterative decoding performance simulation figure of Turbo product codes and space-time block code cascade.Embodiment For the ease of description, we illustrate by taking one reception antenna of two emitting antennas and QPSK as an example herein, can be generalized to the multiple reception antennas of multiple transmitting antennas and other modulation schemes.
Encode, using one reception antenna of two emitting antennas, modulated using QPSK for the cascade of Turbo product codes and space-time block code as shown in Figure 1.Input bit carries out the bit after TPC codings, coding by interweaving first, and the bits switch after intertexture is modulated, two after modulation continuous symbol is designated as into symbol to these symbolsXl, x2, in a symbol period,
Figure IMGF000008_0001
x2Launch simultaneously from antenna 1 and antenna 2 respectively, in next symbol period ,-^ and ￡ launch simultaneously from antenna 1 and antenna 2 respectively.Assuming that the channel fading between t, transmitting antenna 1 and reception antenna is designated as ^ (t), the channel fading between transmitting antenna 2 and reception antenna is designated as h2(t) signal that, reception antenna is received is designated as r (t), receives signal and is disturbed by white Gaussian noise, the bilateral power spectral density of noise is designated as.So have：
r (t) = hi (t) x1 + h2 (t) x2 + vt
r(t+T) = .it+TX— x'2 ) + h2(t+T) x; + vt+T(1) in order to being iterated decoding between TPC and space-time block code.Need to obtain bit b by space-time block code decodingl5 b2, b3, b4Soft Inform ation, these Soft Inform ations are used as the input Soft Inform ation of TPC decoders, and then TPC decoding output feeds back to space-time block code decoder as prior information, is so iterated decoding.For this, we do conversion below.
Space-time block code encoding scheme shown in Fig. 2 can be regarded as a kind of Fig. 3 special case, when the code word create-rule of " the block coder BC21 of 1/2 code check " in Fig. 3 is：
DBC21 = b-GBC21e e (2)
Wherein DBC21 = (dl5 d8). b = (bl5b2,b3,b4)
Figure IMGF000008_0002
e = (00 0 0 0 1 1 0)
At this moment the encoding scheme equivalent shown in the encoding scheme and Fig. 3 shown in Fig. 2.For using
" BC21 " in the situation of N number of transmitting antenna, Fig. 3 can use " the block coder of 1/N code checks BCN1 is replaced ".For any space-time block code scheme, it can be replaced with the scheme shown in Fig. 3, the code word create-rule of different simply wherein " BC21 " this modules will do corresponding change.
When " BC21 " in Fig. 3 is used（2) formula is generated during code word, and Fig. 3 is just and Fig. 2 equivalents, such Fig. 1 and following Fig. 4 equivalents.
In order to enter row decoding, we need to calculate bit by reception signal r (t), r (t+T) first, Ι ^ Ι ^ Soft Inform ation.The calculating of these Soft Inform ations can use many algorithms, a kind of LOG- MAP algorithms of bit-level be provided here, arthmetic statement is as follows：
Figure IMGF000009_0001
∑Pr(D|r(t),r(t + T))
^■Dr1
∑Pr(D|r(t),r(t + T))
Figure IMGF000009_0002
max [ln(Pr(r(t),r(t+T)|D)+ln(Prp)))] - max[ln (Pr (r (t), r (t+T) lD)+ln (Pr (D)))] (3) wherein 1=1,2,3,4.Ω is the codeword set of " BC21 ", and D is some code word in the set<
Figure IMGF000009_0003
Assuming that information bit ^ priori Soft Inform ation is designated as
Pr(b,° D i= 1,2,3,4.
Pr( b, = 0) ,
Figure IMGF000009_0004
ln[Pr(D)] = Σ^ -λ,- - Constl (5)
In is a constant.
Pr[r(t);r(t+T)|D] = Pr[r(t)|Xl,x2] · Pr[r(t+T)|x3,x4]
r(t+T)-h,(t+T)-x3-h2(t+T)-X4
= Const 2 - e N°L ln[Pr(r(t),r(t + T)|D)]
= Const3 --^-|r(t)― h,(t) . x, - h2(t) ·χ2|2+ |r(t + T)-h,(t + T)-x3 -h2(t + T)-x4|2]
Figure IMGF000010_0001
« max j∑bi■ λ( -^-|r(t)― h^t) - x, - h2(t) -x2 + |r(t + T)-h,(t + T)-x3- h2(t + T) . x4|2}
-12(1 + " 4|2
Figure IMGF000010_0002
J(5) obtained Soft Inform ation calculated above send the decoding that TPC decoders carry out TPC." BC21 " decoder use can be given after the Soft Inform ation of TPC decoders output is interleaved as prior information.TPC and
Iterative decoding between " BC21 " is as shown in Figure 5.
TPC decoders are also the process of an iterative decoding in itself, and the iterations of TPC decoders in itself is designated as iter-tpc, the iterations between TPC and " BC21 " is designated as iter-out.The two iterationses can be selected flexibly, it is considered that it is better that selection iter-tpc is equal to 2 effects.
As shown in fig. 6, being simulation result；
Table 1 is simulation parameter；
Table 1:
Parameter value
Outer code TPC (32,26,4)2, using PML decoding algorithms
ISN space-time block code
Iterations Iter_tpc=2, iter out=2,4,8
Channel list footpath, ^ rates it is flat ' faded Rayleigh channel
60 kilometers/hour of speed
Transmitting antenna, a kind of coding method of the invention by providing Turbo product codes and space-time block code cascade of one reception antenna of reception antenna two emitting antennas, reduce the complexity and decoding delay of decoding, reduce the expense that Slow is deposited, the iterative decoding between Turbo product codes and space-time block code is employed, coding gain is also substantially increased while diversity gain is obtained.
Above embodiment is to illustrate the invention and not to limit the present invention. Bibliography of the present invention is as follows：
[l].Siavash M. Alamouti, "A simple Transmit Diversity Technique for Wireless Communications," IEEE Journal on select areas in communications. Vol. 16. NO.8, October 1998.
[2].Vahid Tarokh, Hamid Jafarkhani and A. Robert Calderbank, "Space-Time Block
Coding for Wireless Communications：Performance Results,, IEEE Journal on select areas in communications. Vol. 17. NO.3, March 1999.
[3].V. Tarokh, N. Seshadri, and A. R. Calderbank, "Space-Time Codes for High Data Rate Wireless Communication: Performance Criterion and Code Construction," IEEE Trans. IT, 44(2):744-765, Mar. 1998.
[4].Zhipei Chi, Zhongfeng Wang and Keshab K. Parhi, "Iterative Decoding of Space-Time Trellis Codes and Related Implementation Issues," Signals, Systems and Computers, 2000. Conference Record of the Thirty-Fourth Asilomar Conference on, Volume: 1, 2000 page(s): 562-566 vol.1
[5] Gerhard Bauc, " Concatenation of Space-Time Block Codes and " Turbo ,-TCM,,
Communications, 1999. ICC'99. 1999 IEEE International Conference on, 1999 page(s): 1202- 1206 vol.2

Claims (1)

  1. Claim
    1. the coding method of a kind of Turbo product codes and space-time block code cascade, including：Transmitting terminal is encoded using the cascade of Turbo product codes and space-time block code；Receiving terminal enters row decoding to the signal of reception.
    2. according to the method described in claim 1, it is characterised in that：Described transmitting terminal carries out coding using the cascade of Turbo product codes and space-time block code and referred to：The bit of input is carried out Turbo product code codings by transmitting terminal, bit after coding is interleaved, bits switch after intertexture is modulated into symbol to described symbol, and the symbol after modulation is launched according to the rule of space-time block code from multiple transmitting antennas.
    3. according to the method described in claim 1, it is characterised in that：Described receiving terminal enters row decoding to the signal of reception and referred to：Receiving terminal enters row decoding, the described iterative decoding being decoded as between Turbo product codes and space-time block code to the signal of reception using the cascade of Turbo product codes and space-time block code..
    4. according to the method described in claim 1, it is characterised in that：Described transmitting terminal carries out coding using the cascade of Turbo product codes and space-time block code and referred to：The bit of input is carried out Turbo product code codings by transmitting terminal, bit after coding is interleaved, bits switch after intertexture is modulated into symbol to described symbol, and the symbol after modulation is launched according to the rule of space-time block code from multiple transmitting antennas；
    Described receiving terminal enters row decoding to the signal of reception and referred to：Receiving terminal using Turbo product codes with when empty point of Group code cascade enter row decoding, the described iterative decoding being decoded as between Turbo product codes and space-time block code to the signal of reception.
    5. method according to claim 2, its step includes：
    One reception antenna of two emitting antennas can be used, and using QPSK modulation；
    Bit after TPC is encoded and is interweaved is carried out to the block code coding of 1/2 code check；Bits switch after coding is into symbol；
    These symbols are modulated, four after modulation continuous symbol can be designated as Wherein x3=-x*2, X4=X*1 oIn a symbol period,1And x2Launch simultaneously from antenna 1 and antenna 2 respectively, in next symbol period, x3=-￡ and x4=￡ launches simultaneously from antenna 1 and antenna 2 respectively；
    Wherein：T is may be provided in, the channel fading between transmitting antenna 1 and reception antenna is (t), the channel fading between transmitting antenna 2 and reception antenna is h2(t) signal that, reception antenna is received is r (t), receives signal and is disturbed by white Gaussian noise, the bilateral power spectral density of noise is
    ；So have：
    r (t) = h1 (t) x1 + h2 (t) x2 + vt
    r(t+T) = h^t+TX _x; ) + h2(t+T) x; + vt+T 。
    6. method according to claim 3, its step includes：
    Receiving terminal obtains bit b by space-time block code decodingl 5 b2, b3, b4Soft Inform ation；
    The input Soft Inform ation that described Soft Inform ation can be decoded as Turbo product codes；
    The decoding output of Turbo product codes feeds back to space-time block code decoding, using the prior information decoded as Shi Kong Fen Group codes, is so iterated decoding.
    7. method according to claim 4, its step includes：
    One reception antenna of two emitting antennas can be used, and using QPSK modulation;
    Bit after TPC is encoded and is interweaved is carried out to the block code coding of 1/2 code check；
    Bits switch after coding is into symbol；
    These symbols are modulated, four after modulation continuous symbol can be designated as x, x2、 x3、 x4, wherein3=-χ*2, 4=χ*!ο is in a symbol period, x2Launch simultaneously from antenna 1 and antenna 2 respectively, in next symbol period, x3=mono- X；And x4=Xl* Fen Do launch simultaneously from antenna 1 and antenna 2；
    :Wherein：T is may be provided in, the channel fading between transmitting antenna 1 and reception antenna is (t), the channel fading between transmitting antenna 2 and reception antenna is h2(t) signal that, reception antenna is received is r (t), receives signal and is disturbed by white Gaussian noise, the bilateral power spectral density of noise is；So have： r (t) = ^ (t) x1 + h2 (t) x2 + vt
    r(t+T) = ht (t+T)( _x; ) + h2(t+T) x; + vt+T；
    Receiving terminal obtains bit b by space-time block code decodingl 5 b2, b3, b4Soft Inform ation；
    The input Soft Inform ation that described Soft Inform ation can be decoded as Turbo product codes；
    5 Turbo product codes decode output feedback signal and decoded to space-time block code, using the prior information decoded as space-time block code, are so iterated decoding.
    8. method according to claim 5, its step further comprises：
    One reception antenna of two emitting antennas can be used, and using QPSK modulation；
    Input bit is first subjected to Turbo product code codings；
    0 ' is interleaved to the bit after coding；
    Bit after intertexture carries out the block code coding of 1/2 code check；
    Bits switch after coding is into symbol；
    These symbols are modulated；
    ' the symbol after modulation launches through serioparallel exchange from antenna.
    5 9. methods according to claim 6, Qi Bu Sudden further comprise：
    Receiving terminal calculates bit b by reception signal r (t), r (t+T)l 5 b2, b3, b4Soft Inform ation；The calculating of the Soft Inform ation can use many algorithms, can at least use the LOG- MAP algorithms of bit-level；Calculate obtained Soft Inform ation and carry out Turbo product code decodings；
    BC21 0 can be given as prior information after the Soft Inform ation of Turbo product codes decoding output is interleaved and enters row decoding；
    The decoding of Turbo product codes is also the process of iterative decoding in itself, and the iterations of Turbo product codes decoding itself is designated as i ter-tpc, Turbo product codes decode between BC21 decodings ' iterations is designated as i ter.out;The two iterationses can be selected flexibly, and one:) ＆ thinks that selection i ter-tpc is equal to 2 effects are better.
    5 10. methods according to claim 7, its step further comprises：
    ' one reception antenna of two emitting antennas can be used, and using QPSK modulation； Input bit is first subjected to Turbo product code codings；
    Bit after coding is interleaved； .
    Bit after intertexture carries out the block code coding of 1/2 code check；
    Bits switch after coding is into symbol；
    These symbols are modulated, four after modulation continuous symbol can be designated as x2、 x3、 x4, wherein
    Figure IMGF000015_0001
    O is in a symbol period, X, and x2Launch simultaneously from antenna 1 and antenna 2 respectively, in next symbol period,3=_ ^ and=￡ launch simultaneously from antenna 1 and antenna 2 respectively；
    Wherein：T is may be provided in, the channel fading between transmitting antenna 1 and reception antenna is ^ (t), the channel fading between transmitting antenna 2 and reception antenna is h2(t) signal that, reception antenna is received is r (t:), receive signal and disturbed by white Gaussian noise, the bilateral power spectral density of noise is 52=N0/2 ；So have：
    r (t) = h1(t)x1 + h2(t)x2 + vt
    r(t+T) = h^t+^C -x; ) + h2(t+T) x; + vt+T；
    ;Receiving terminal calculates bit b by reception signal r (t), r (t+T)l5 b2, b3, b4Soft Inform ation；The calculating of the Soft Inform ation can use many algorithms, can at least use a kind of LOG-MAP algorithms of bit-level；Calculate obtained Soft Inform ation and carry out Turbo product code decodings；
    BC21, which can be given, after the Soft Inform ation of Turbo product codes decoding output is interleaved as prior information enters row decoding；
    The decoding of Turbo product codes is also the process of an iterative decoding in itself, and the iterations of Turbo product codes decoding itself is designated as iter-tpc, and Turbo product codes, which are decoded the iterations between BC21 decodings, is designated as iter-out;The two iterationses can be selected flexibly, it is considered that it is better that selection iter.tpc is equal to 2 effects.
    11. the method according to claim 5 or 7 or 8 or 10, it is characterised in that the block code coding of 1/2 described code check need to meet following condition：
    DBCSI = b · GBC21 ø e Wherein： DBC21 = (d,, d2..., d8). b = (bl5b2,b35b4)
    Figure IMGF000016_0001
    e = (0 0 0 0 0 1 1 0)。
    12. the method according to claim 5 or 7 or 8 or 10, it is characterized in that, described ' 5 can be extended to the multiple reception antennas of multiple transmitting antennas using one reception antenna of two emitting antennas, and described use QPSK modulation can be extended to other modulation.
    13. the method according to claim 5 or 7 or 8 or 10, it is characterised in that described can be extended to the multiple reception days of multiple transmitting antennas using one reception antenna of two emitting antennas
    ' line, the use QPSK described in, which is modulated, can be extended to other modulation；
    10 wherein：When using N number of transmitting antenna, the block code coding of described 1/2 code check can be by
    The block code coding of 1/N code checks is replaced, i.e.,：BC21 can be replaced by BCN1；
    The code device of a kind of Turbo product codes in ' 14. and space-time block code cascade, wherein：Transmitting terminal at least includes Turbo product code encoders, space-time block code encoder；By the way that described Turbo is multiplied into 15 product code coders and space-time block code encoder cascade, input bit is encoded；
    Receiving terminal at least includes Turbo products code decoder, space-time block code decoder；By by described Turbo products code decoder and space-time block code decoder cascade, the signal of reception translate ' code.
    15. device according to claim 14, it is characterised in that：Transmitting terminal also includes interleaver, the conversion equipment and modulator of 20 bits to symbol；
    Transmitting terminal TPC is encoded after bit input interleaver, bit input bit after intertexture to according with ' number conversion equipment, the symbol input modulator being converted into, the symbol after modulation is sent on multiple transmitting antennas according to the rule of space-time block code.
    16. device according to claim 14, it is characterised in that：The code decoder of Turbo products 25 and space-time block code decoder of receiving terminal are in the form of cascade, and composition can be iterated the decoding of decoding Device.
    17. device according to claim 14, it is characterised in that：
    Transmitting terminal also includes interleaver, the conversion equipment and modulator of bit to symbol；
    ' transmitting terminal TPC is encoded after bit input interleaver, bit input bit after intertexture is to according with
    The conversion equipment of No. 5, the symbol input modulator being converted into, the symbol after modulation is sent on multiple transmitting antennas according to the rule of space-time block code；
    The Turbo products code decoder and space-time block code decoder of receiving terminal are in the form of cascade, group
    - into the code translator of decoding can be iterated.
    18. device according to claim 14, it is characterised in that：Transmitting terminal also includes interleaver, the conversion equipment of 10 bits to symbol, modulator and serioparallel exchange device；
    Transmitting terminal cascade is encoded after bit input bit to the conversion equipment of symbol, the symbol being converted into
    Symbol after-number input modulator, symbol input string and conversion equipment after modulation, serioparallel exchange is sent on .. transmitting antennas.
    19. device according to claim 14, it is characterised in that：Transmitting terminal also includes interleaver, the conversion equipment of 15 bits to symbol, modulator and serioparallel exchange device；
    - ' transmitting terminal cascade is encoded after the defeated input bit of bit to the conversion equipment of symbol, be converted into
    The symbol after symbol input modulator, symbol input string and conversion equipment after modulation, serioparallel exchange is sent on antenna；
    The Turbo products code decoder and space-time block code decoder of receiving terminal are in the form of cascade, and Group 20 is into can be iterated the code translator of decoding.
    25
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