WO2003088502A1 - A coding method and apparatus involves the concatenation of turbo product code and time-space block code - Google Patents

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 signal is 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 product code and Time-space block code, obtains diversity gains as well as increased the coding gain.

Description

 Method and device for encoding Turbo product code and space-time block code cascade

 Technical field

 The present invention relates to the field of communication technologies, and in particular, to a space-time coding method and apparatus for a communication system.

5, specifically speaking, is a coding method and device of Turbo Product Code (TPC) and Space Time Block Code (STBC) cascade. Background technique

It is well known that in fading channels, the fading of the signal will severely degrade the performance of the system. The most effective means of overcoming fading is the use of diversity techniques. The space-time coding technique ^[1 ' ² ' ^3] can simultaneously obtain diversity gain and coding gain, overcome the influence of fading, and improve the reliability of transmission.

 In recent years, the combination of spatiotemporal coding and channel error correction code has attracted people's attention. The effective combination of the two can make the system obtain the gain of the diversity and the gain of the coding while gaining additional coding gain. Fading performance and error correction performance.

Most of the existing systems use the combination of convolutional code ^[4] or Turbo code ^[5] and space-time code. The decoding complexity of these 15 cases is too high, there are certain difficulties in practical applications, and there is no channel error correction. Iterative decoding between the code and the space-time code does not achieve a sufficiently large coding gain. Summary of the invention

An object of the present invention is to provide a coding method and apparatus for concatenating Turbo product code and space-time block code. The method and apparatus use TPC as an outer code and a space-time block code ^[1 ' ^2] as a concatenation of an inner code. In the case of 20, the LOG-MAP decoding algorithm for the space-time block code at the bit level is given, and the algorithm for iterative decoding between the TPC and the #空 block code is given. Using TPC as the outer code of concatenated coding, • P strives for lower decoding complexity and decoding delay, reduces the overhead of buffering, and uses iterative decoding between Turbo product code and space-time block code.

 The gain of the coding is greatly improved while the diversity gain is obtained.

25 'The technical solution of the present invention is: The present invention provides a Turbo product code and a space-time block code The coding method of the concatenation includes: the transmitting end is encoded by using a Turbo product code and a concatenation of a spatiotemporal block code; and the receiving end decodes the received signal.

 The transmitting end uses the Turbo product code and the concatenation of the spatiotemporal block code to encode: the transmitting end encodes the input bit by Turbo product code, interleaves the encoded bit, and converts the interleaved bit into a symbol. The symbols are modulated, and the modulated symbols are transmitted from a plurality of transmitting antennas according to the rules of space-time block codes.

 The receiving end decoding the received signal means: the receiving end decodes the received signal by using a cascade of a turbo product code and a spatio-temporal block code, and the decoding is a Turbo product code and a space-time block code. Iterative decoding between.

 The method, the steps of the method include:

 Two transmit antennas can be used, one receive antenna, and QPSK modulation is used;

 Converting the TPC encoded and interleaved bits into symbols;

These modulation symbols, two successive modulation symbols can be written as x _2, within a symbol period, x _2, respectively from the antennas 1 and 2 are simultaneously transmitted out the next symbol period, - £ ^ ₂ and Simultaneously transmitting from antenna 1 and antenna 2;

Where: it can be set at time t, the channel fading between the transmitting antenna 1 and the receiving antenna is ^ (t), the channel fading between the transmitting antenna 2 and the receiving antenna is h ₂ (t), and the signal received by the receiving antenna For r (t), the received signal is interfered by Gaussian white noise, and the bilateral power spectral density of the noise is σ ² = Ν ₀ /2 ;

r (t) = hj lx! + h ₂ (t) x ₂ + v _t

r(t+T) = h t+T)(— _x ; ) + h ₂ (t+T) _x ; + v _t+T

 The method, the steps of the method include:

The receiving end decodes the space-time block code to obtain soft information of bits b _l b ₂ , b ₃ , b ₄ ;

 The obtained soft information is used as input soft information of the turbo product code decoder;

The Turbo product code decoder outputs feedback information to the space-time block code decoding as a priori information for the decoding of the space-time block code, thus performing iterative decoding. The method, the step further comprising:

 Two transmit antennas can be used, one receive antenna, and QPSK modulation is used;

 First input the bit into the Turbo product code;

 Interleaving the encoded bits;

 The interleaved bits are coded by a 1/2 code rate block code (denoted as BC21);

 The encoded bits are converted into symbols;

 Modulating these symbols;

 The modulated symbols are transmitted from multiple transmit antennas after being serially converted and converted.

 The method, the step of the method may further include:

The receiving end calculates the soft information of the bits b _l5 b ₂ , b ₃ , b ₄ from the received signals r (t), r (t+T); the soft information can be calculated by using various algorithms, and at least the bit level LOG can be used. - MAP algorithm; the calculated soft information is decoded by Turbo product code;

 The soft information outputted by the turbo code product code is interleaved and can be sent to the BC21 as a priori information for decoding;

 Turbo product code decoding itself is also an iterative decoding process. The number of iterations of Turbo product code decoding itself is recorded as i ter-tpc, and the number of iterations between Turbo product code decoding and BC21 decoding is recorded as i ter — out ; These two iterations can be flexibly chosen. It is generally considered that selecting i ter- tpc equals 2 is better.

 The method described, the steps of which more specifically include:

 Two transmit antennas can be used, one receive antenna, and QPSK modulation is used;

 First input the bit into the Turbo product code;

 Interleaving the encoded bits;

 The interleaved bits are coded by a 1/2 code rate block code;

 The encoded bits are converted into symbols;

分别从天线 1和天线 2上同时发射出去； 其中：可设在 t时刻，发射天线 1和接收天线之间的信道衰落为 h t) , 发射天线 2 和接收天线之间的信道衰落为 h₂ (t) , 接收天线收到的信号为 r (t) ,接收信号受到高斯白噪声的干扰， 噪声的双边功率谱密度为 ； 这样有： r (t) = h₁ (t) x₁ + h₂ (t) x₂ + v_t These symbols are modulated, four consecutive modulation symbols may be referred to as _{Xl, x 2, x 3,} x 4, within a symbol period, respectively, and x ₂ from the antennas 1 and 2 emitted simultaneously, at the next Within the symbol period,

Simultaneously transmitting from antenna 1 and antenna 2; wherein: at time t, the channel fading between the transmitting antenna 1 and the receiving antenna is ht), and the channel fading between the transmitting antenna 2 and the receiving antenna is h ₂ ( t), the signal received by the receiving antenna is r (t), the received signal is interfered by Gaussian white noise, and the bilateral power spectral density of the noise is; thus: r (t) = h ₁ (t) x ₁ + h ₂ (t) x ₂ + v _t

r(t+T) -t^t+TX-x; ) + h ₂ (t+T) _x ;+v _t+x ; the receiving end calculates the bits from the received signals r (t), r (t+T) Soft information of b ₂ , b ₃ , b ₄ ;

 The calculation of the soft information may be performed by using a plurality of algorithms, and at least one bit level LOG-MAP algorithm may be used; and the calculated soft information is used to perform Turbo product code decoding;

 The soft information outputted by the Turbo product code is interleaved and can be sent to the BC21 as a priori information for decoding;

 Turbo product code decoding itself is also an iterative decoding process. The iteration number of Turbo product code decoding itself is recorded as i ter-tpc, and the number of iterations between Turbo product code decoding and BC21 decoding is recorded as i ter_out. The number of these two iterations can be flexibly chosen. It is generally considered that selecting iter.tpc equals 2 is better.

 The 1/2 code rate block code encoding needs to satisfy the following conditions:

Where: D _BC21 = (d!, ... , d ₈ ). b = (b _l5 b ₂ , b ₃ , b ₄ )

 e = (0 0 0 0 0 1 1 0).

 The two antennas can be used as one receiving antenna, and can be extended to multiple receiving antennas, and the QPSK modulation can be extended to other modulations.

Wherein: when N transmit antennas are used, the 1/2 code rate block code code may be replaced by a 1/N code rate block code code, ie: BC21 may be replaced by BCN1; The present invention also provides an encoding apparatus for concatenating a turbo product code and a space-time block code, wherein: the transmitting end includes at least a turbo product code encoder and a spatio-temporal block code encoder; and the turbo multi-product code encoder and the space-time a block code encoder concatenating, encoding an input bit; the receiving end comprises at least a Turbo product code decoder, a spatiotemporal block code decoder; by using the Turbo product code decoder and a spatiotemporal block code decoder stage Connect, decode the received signal.

 The device is characterized in that: the transmitting end further comprises an interleaver, a bit-to-symbol conversion device and a modulator;

 The transmitting end inputs the serially encoded bit into a symbol conversion device, and converts the converted symbol into an input modulator, and the modulated symbol is serially converted and sent to a plurality of transmitting antennas for transmission.

 The apparatus is characterized in that: the Turbo product code decoder and the space-time block code decoder at the receiving end form a decoding device capable of iterative decoding in a cascade form.

 The effect of the present invention is to reduce the complexity of the decoding and the decoding delay by reducing the complexity of the decoding and the decoding delay by providing a coding method and apparatus for combining the Turbo product code and the space-time block code. The Turbo product code is used. The iterative decoding between time and space block codes greatly improves the coding gain while obtaining the diversity gain.

DRAWINGS

 1 is a block diagram showing a cascaded coding structure of a receiving antenna and a QPSK modulated Turbo product code and a space-time block code using two transmitting antennas;

 2 is a block diagram of a space-time block code coding structure;

 3 is a block diagram of a 1/2 code rate space-time block code coding structure;

 4 is a block diagram showing a cascaded coding structure of a receiving antenna and a QPSK modulated Turbo product code and a 1/Z code rate spatiotemporal block code using two transmitting antennas;

5 is a block diagram of an iterative decoding structure of a Turbo product code and a space-time block code cascade; FIG. 6 is a simulation diagram of an iterative decoding performance of a Turbo product code and a space-time block code cascade. Detailed ways For ease of description, here we use two transmit antennas, one receive antenna and QPSK as an example, which can be extended to multiple receive antennas and multiple modulation schemes.

x₂分别从天线 1和 天线 2上同时发射出去， 在下一个符号周期内， — ^和£分别从天线 1和 天线 2上同时发射出去。 假设在 t时刻， 发射天线 1和接收天线之间的信 道衰落记为 ^ (t)，发射天线 2 和接收天线之间的信道衰落记为 h₂ (t) , 接 收天线收到的信号记为 r (t)，接收信号受到高斯白噪声的干扰， 噪声的双 边功率谱密度记为 。 这样有： As shown in Fig. 1, the turbo coding of the turbo product code and the space-time block code is performed. Two transmit antennas and one receive antenna are used, and QPSK modulation is adopted. TPC input bits is first coded, interleaved coded bits, interleaved bits converted into symbols, these modulation symbols, two consecutive symbols is modulated referred _Xl, x _2, within a symbol period,

x ₂ is simultaneously transmitted from the antenna 1 and the antenna 2, respectively, and - ^ and £ are simultaneously transmitted from the antenna 1 and the antenna 2, respectively, in the next symbol period. It is assumed that at time t, the channel fading between the transmitting antenna 1 and the receiving antenna is recorded as ^ (t), and the channel fading between the transmitting antenna 2 and the receiving antenna is recorded as h ₂ (t), and the signal received by the receiving antenna is recorded as r (t), the received signal is interfered by Gaussian white noise, and the bilateral power spectral density of the noise is recorded as . This has:

r (t) = hi (t) x ₁ + h ₂ (t) x ₂ + v _t

r(t+T) = .it+TX— _x ' ₂ ) + h ₂ (t+T) _x ; + v _t+T (1) In order to be able to perform iterative decoding between TPC and spatiotemporal block codes. The soft information of the bits b _l5 b ₂ , b ₃ , b ₄ needs to be decoded by the space-time block code, and the soft information is used as the input soft information of the TPC decoder, and then the decoding output of the TPC is fed back to the space-time block code decoding. The device is used as a priori information, and thus iteratively decoded. For this we make the following transformation.

 The space-time block code coding scheme shown in FIG. 2 can be regarded as a special case of FIG. 3. When the codeword generation rule of the "1/2 code rate block code encoder BC21" in FIG. 3 is:

D _BC21 = bG _BC21 ee (2)

Where D _BC21 = (d _l5 d ₈ ). b = (b _l5 b ₂ , b ₃ , b ₄ )

 e = (00 0 0 0 1 1 0)

 At this time, the coding scheme shown in Fig. 2 is completely equivalent to the coding scheme shown in Fig. 3. For adoption

In the case of N transmit antennas, "BC21" in Fig. 3 can use "1/N code rate block code encoder" BCN1 is substituted for ". For any space-time block code scheme, the scheme shown in Figure 3 can be used instead. The only difference is that the codeword generation rule of the "BC21" module has to be changed accordingly.

 • When "BC21" in Figure 3 uses (2) to generate a codeword, Figure 3 is exactly equivalent to Figure 2, so Figure 1 is exactly equivalent to Figure 4 below.

In order to decode, we first need to calculate the soft information of the bits, Ι^Ι^ from the received signal r(t), r(t+T). The calculation of these soft information can use a variety of algorithms. Here is a bit-level LOG-MAP algorithm. The algorithm is described as follows:

 ∑Pr(D|r(t),r(t + T))

^■Dr ¹

∑Pr(D|r(t),r(t + T))

Max [ln(Pr(r(t),r(t+T)|D)+ln(Prp)))] - _max [ln(Pr(r(t),r(t + T)lD) + ln (Pr(D)))] (3) where 1 = 1, 2, 3, 4. Ω is the set of codewords of "BC21", and D is one of the codewords in the set<

 Suppose the a priori soft information of the information bit ^ is recorded as

 Pr(b,° D i= 1,2,3,4.

 Pr( b, = 0) ,

 Ln[Pr(D)] = Σ^ -λ,- - Constl (5)

In 是一个常数。

In is a constant.

Pr[r(t) _; r(t+T)|D] = Pr[r(t)| _Xl ,x ₂ ] · Pr[r(t+T)|x ₃ ,x ₄ ]

r(t+T)-h,(t+T)-x ₃ -h ₂ (t+T)- _X4

= Const 2 - e ^N ° ^L Ln[Pr(r(t),r(t + T)|D)]

= Const3 --^-|r(t)― h,(t) . x, - h ₂ (t) ·χ ₂ | ² + |r(t + T)-h,(t + T)-x ₃ -h ₂ (t + T)-x ₄ | ² ]

« max j∑b _i ■ λ ₍ -^-|r(t)― h^t) - x, - h ₂ (t) -x ₂ + |r(t + T)-h,(t + T) -x ₃ - h ₂ (t + T) . x ₄ | ² }

-1 ₂ (1 + " ₄ | ²

^J (5) 上面计算得到的软信息送 TPC译码器进行 TPC的译码。 TPC译码器 输出的软信息经交织后可以作为先验信息送给 "BC21" 译码器用。 TPC和

^J (5) The soft information calculated above is sent to the TPC decoder for TPC decoding. The soft information output by the TPC decoder can be used as a priori information for the "BC21" decoder after interleaving. TPC and

The iterative decoding between "BC21" is shown in Figure 5.

 The TPC decoder itself is also an iterative decoding process. The iteration number of the TPC decoder itself is written as iter_tpc, and the number of iterations between TPC and "BC21" is recorded as iter_out. The number of these two iterations can be flexibly chosen. It is generally considered that selecting iter-tpc equals 2 is better.

 As shown in Figure 6, it is the simulation result;

 Table 1 is the simulation parameters;

 Table 1:

 Parameter value

External code TPC (32,26,4) ² , using PML decoding algorithm

 Inner code space-time block code

 Number of iterations Iter_tpc=2, iter out = 2, 4, 8

 Channel single path, ^ flattened 'fading Rayleigh channel

 Speed 60 km / h

 Transmitting antenna, receiving antenna, two transmitting antennas, one receiving antenna, the present invention provides a coding method of Turbo product code and space-time block code concatenation, which reduces decoding complexity and decoding delay, and reduces buffer overhead. The iterative decoding between Turbo product code and space-time block code is adopted, and the gain of coding is greatly improved while obtaining the diversity gain.

The above specific embodiments are merely illustrative of the invention and are not intended to limit the invention. The references referred to in the present invention are 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 AR 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

Rights request  A coding method for concatenating a turbo product code with a space-time block code, wherein: the transmitter uses a turbo product code and a concatenation of a spatio-temporal block code for encoding; and the receiving end decodes the received signal.  . The method according to claim 1, wherein the transmitting end is encoded by using a Turbo product code and a concatenation of a space-time block code, wherein: the transmitting end encodes the input bit by Turbo product code, and encodes the code. The latter bits are interleaved, the interleaved bits are converted into symbols, the symbols are modulated, and the modulated symbols are transmitted from a plurality of transmit antennas in accordance with the rules of space-time block codes.  3. The method according to claim 1, wherein: the receiving end decoding the received signal means: the receiving end decodes the received signal by using a Turbo product code and a contemporaneous time-space block code. The decoding is an iterative decoding between the Turbo product code and the spatiotemporal block code. .  The method according to claim 1, wherein the transmitting end is encoded by using a Turbo product code and a concatenation of a space-time block code, wherein: the transmitting end encodes the input bit by Turbo product code, and encodes the code. The latter bits are interleaved, the interleaved bits are converted into symbols, and the symbols are modulated, and the modulated symbols are transmitted from a plurality of transmitting antennas according to the rules of space-time block codes;  The receiving end decoding the received signal means: the receiving end decodes the received signal by using a cascade of a turbo product code and a spatio-temporal block code, and the decoding is a Turbo product code and a space-time block code. Iterative decoding between.  5. The method of claim 2, the steps comprising:  Two transmit antennas can be used, one receive antenna, and QPSK modulation is used;  The TPC-encoded and interleaved bits are coded by a 1/2 code rate block code; the encoded bits are converted into symbols; Modulating these symbols, the four consecutive symbols after modulation can be recorded as Where x ₃ = -x* ₂ , X ₄ =X* _{1 o} In one symbol period, ₁ and x ₂ are simultaneously transmitted from antenna 1 and antenna 2, respectively, in the next symbol period, x ₃ = - £ and x ₄ = £ is simultaneously transmitted from antenna 1 and antenna 2; Where: at time t, the channel fading between the transmitting antenna 1 and the receiving antenna is (t), the channel fading between the transmitting antenna 2 and the receiving antenna is h ₂ (t), and the signal received by the receiving antenna is r (t), the received signal is interfered by Gaussian white noise, and the bilateral power spectral density of the noise is ; This has: r (t) = h ₁ (t) x ₁ + h ₂ (t) x ₂ + v _t r(t+T) = h^t+TX _ _x ; ) + h ₂ (t+T) _x ; + v _t+T .  6. The method of claim 3, the steps comprising: The receiving end decodes the space-time block code to obtain soft information of bits b _{l 5} b ₂ , b ₃ , b ₄ ;  The soft information can be used as input soft information decoded by the turbo product code;  The turbo code product decodes the output feedback information to the space-time block code decoding, and uses it as a priori information for the decoding of the space-time block code, thus performing iterative decoding.  7. The method of claim 4, the steps comprising:  Two transmit antennas can be used, one receive antenna, and QPSK modulation is used;  The TPC-encoded and interleaved bits are coded by a 1/2 code rate block code;  The encoded bits are converted into symbols; Modulating these symbols, the four consecutive symbols after modulation can be written as x, x ₂ , x ₃ , x ₄ , where ₃ = -χ* ₂ , ₄ =χ*! ο In one symbol period, x ₂ respectively Simultaneously transmitting from antenna 1 and antenna 2, in the next symbol period, x ₃ = one X; and x ₄ = _Xl * are simultaneously transmitted from antenna 1 and antenna 2, respectively; _: where: at time t, the channel fading between the transmitting antenna 1 and the receiving antenna is (t), the channel fading between the transmitting antenna 2 and the receiving antenna is h ₂ (t), and the signal received by the receiving antenna is r (t), the received signal is interfered by Gaussian white noise, and the bilateral power spectral density of the noise is; r (t) = ^ (t) x ₁ + h ₂ (t) x ₂ + v _t r(t+T) = h _t (t+T)( _ _x ; ) + h ₂ (t+T) _x ; + v _t+T ; The receiving end decodes the space-time block code to obtain soft information of bits b _{l 5} b ₂ , b ₃ , b ₄ ;  The soft information can be used as input soft information decoded by the turbo product code; 5 Turbo product code decodes the output feedback signal to the space-time block code decoding, as the a priori information of the space-time block code decoding, thus performing iterative decoding.  8. The method of claim 5, the further comprising:  Two transmit antennas can be used, one receive antenna, and QPSK modulation is used;  First input the bit into the Turbo product code; 0 'interleave the encoded bits;  The interleaved bits are coded by a 1/2 code rate block code;  The encoded bits are converted into symbols;  Modulating these symbols;  The modulated symbol is transmitted from the antenna via serial-to-parallel conversion.  The method according to claim 6, the step further comprising: The receiving end calculates the soft information of the bits b _{l 5} b ₂ , b ₃ , b ₄ from the received signals r (t), r (t+T); the soft information can be calculated by using various algorithms, at least bit level LOG-MAP algorithm; the calculated soft information is decoded by Turbo product code;  The soft information outputted by the Turbo product code is interleaved and can be sent to BC21 0 as a priori information for decoding;  Turbo product code decoding itself is also an iterative decoding process. The iteration number of Turbo product code decoding itself is recorded as i ter-tpc, and the number of iterations between Turbo product code decoding and BC21 decoding is recorded as i. Ter.out ; These two iterations can be flexibly chosen, one:) & think that choosing i ter- tpc equals 2 is better.  5. The method of claim 7, the further comprising: 'Two transmit antennas can be used for one receive antenna and QPSK modulation is used; First, the input bit is encoded by Turbo product code;  Interleaving the encoded bits;  The interleaved bits are coded by a 1/2 code rate block code;  The encoded bits are converted into symbols; Modulating these symbols, the four consecutive symbols after modulation can be recorded as x ₂ , x ₃ , x ₄ , where

o In one symbol period, X, and x ₂ are simultaneously transmitted from antenna 1 and antenna 2, respectively. In the next symbol period, ₃ = _^ and = £ are simultaneously transmitted from antenna 1 and antenna 2, respectively; Wherein: at time t, the channel fading between the transmitting antenna 1 and the receiving antenna is ^ (t), the channel fading between the transmitting antenna 2 and the receiving antenna is h ₂ (t), and the signal received by the receiving antenna is r(t _: ), the received signal is interfered by Gaussian white noise, and the bilateral power spectral density of the noise is 5 ² =N ₀ /2 ; r (t) = h ₁ (t)x ₁ + h ₂ (t)x ₂ + v _t r(t+T) = h^t+^C - _x ; ) + h ₂ (t+T) _x ; + v _t+T ; The receiving end calculates the soft information of the bits b _l5 b ₂ , b ₃ , b ₄ from the received signals r (t), r (t+T); the soft information can be calculated using a plurality of algorithms, at least one bit can be used Level LOG-MAP algorithm; calculated soft information for Turbo product code decoding;  The soft information outputted by the Turbo product code is interleaved and can be sent to the BC21 as a priori information for decoding;  Turbo product code decoding itself is also an iterative decoding process. The iteration number of Turbo product code decoding itself is recorded as iter-tpc, and the number of iterations between Turbo product code decoding and BC21 decoding is recorded as iter-out. The number of these two iterations can be flexibly chosen. It is generally considered that selecting iter.tpc equals 2 is better.  The method according to claim 5 or 7 or 8 or 10, wherein the 1/2 code rate block code encoding needs to satisfy the following conditions: DBCSI = b · G _BC21 ø e Where: D _BC21 = (d,, d ₂ , ..., d ₈ ). b = (b _l5 b ₂ , b ₃₅ b ₄ )

 e = (0 0 0 0 0 1 1 0).  The method according to claim 5 or 7 or 8 or 10, wherein the '5 can adopt two transmitting antennas, one receiving antenna can be generalized into multiple receiving antennas, and multiple receiving antennas. QPSK modulation can be generalized to other modulations.  The method according to claim 5 or 7 or 8 or 10, wherein the receiving antenna can adopt two transmitting antennas, and one receiving antenna can be generalized into multiple transmitting antennas for multiple receiving days. 'Line,. The use of QPSK modulation can be generalized to other modulations;  10 where: when N transmit antennas are used, the 1/2 code rate block code encoding may be 1/N code rate block code encoding replacement, ie: BC21 can be replaced by BCN1; 14. An encoding apparatus for concatenating a turbo product code with a space-time block code, wherein: the transmitting end includes at least a turbo product code encoder, a spatiotemporal block code encoder; and multiplying the Turbo by a 15 product code encoder with time and space Block code encoder concatenation, encoding input bits;  The receiving end includes at least a Turbo product code decoder and a spatiotemporal block code decoder; and the received signal is translated by code by concatenating the Turbo product code decoder with the spatiotemporal block code decoder.  15. The apparatus according to claim 14, wherein: the transmitting end further comprises an interleaver, a 20-bit to symbol conversion device and a modulator;  The transmitting end inputs the TPC encoded bit into the interleaver, and the interleaved bit input bit is input to the symbol conversion device, and the converted symbol is input to the modulator, and the modulated symbol is sent to the plurality of transmitting antennas according to the rule of the space-time block code. on. 16. The apparatus according to claim 14, wherein: the Turbo product 25 code decoder and the space-time block code decoder at the receiving end form a decoding capable of iterative decoding in a cascade form. Device.  17. Apparatus according to claim 14 wherein:  The transmitting end further includes an interleaver, a bit-to-symbol conversion device, and a modulator; 'The transmitting end inputs the TPC encoded bit into the interleaver, and the interleaved bit inputs the bit to the symbol. The conversion device of No. 5 converts the symbol into a modulator, and the modulated symbols are sent to the plurality of transmitting antennas according to the rules of the space-time block code;  The Turbo product code decoder and the space-time block code decoder at the receiving end are cascaded, group - a decoding device that can perform iterative decoding.  18. The apparatus according to claim 14, wherein: the transmitting end further comprises an interleaver, a 10-bit to symbol conversion device, a modulator, and a serial to parallel conversion device;  The transmitting end converts the bit-coded bit into a symbol conversion device, and converts the symbol into a symbol - The input modulator, the modulated symbol input string and conversion device, and the serial-converted symbol is sent to the .. transmit antenna.  19. The apparatus according to claim 14, wherein: the transmitting end further comprises an interleaver, a 15-bit to symbol conversion device, a modulator, and a serial to parallel conversion device;  - 'The transmitting end converts the serially encoded bit into a bit-to-symbol conversion device, which is converted into a symbol input modulator, a modulated symbol input string and conversion device, and the serially converted symbol is sent to the antenna;  The Turbo product code decoder and the space-time block code decoder at the receiving end are grouped into a decoding device capable of iterative decoding in a cascade form. 25