CN102098141A - Link transmission device and method in SC-FDMA (Single Carrier-Frequency Division Multiple Access) system and space time block code coder and method - Google Patents

Abstract

The invention discloses a link transmission unit in an SC-FDMA (Single Carrier-Frequency Division Multiple Access) system, which comprises a channel coding module, a constellation modulation module, a data shunt module, a DFT (Discrete Fourier Transform) module, an STBC (Space Time Block Coding) device, a resource mapping module, an IFFT (Inverse Fast Fourier Transform ) module and a transmitting module, wherein the data shunt module is used for shunting the constellation modulated time domain data stream input by the constellation modulation module, and performing STBC and DFT in turn on the shunted time domain sub data streams or DFT and STBC in turn. By using the device and the method, because of the data shunt module, the shunted time domain sub data streams can be converted into frequency domain sub data streams, then the frequency domain sub data streams are subjected to STBC, and the time domain sub data streams can also be directly subjected to STBC, so that the STBC can be performed before the DFT or after the DFT and the flexibility of system design is improved.

Description

Link transmission device and method in SC-FDMA system and space-time block code encoder and method

Technical Field

The present invention relates to wireless communication systems, and more particularly, to a link transmission apparatus and method and a space-time block code (STBC) coder and coding method in a single carrier frequency division multiple access (SC-FDMA) system.

Background

Currently, uplink transmission in the advanced long term evolution (LTEadvanced) under consideration by the third generation partnership project (3GPP) is based on the SC-FDMA technology, and a STBC transmit diversity method is employed when uplink transmission is performed in the SC-FDMA system. The uplink transmission apparatus using the above method includes an uplink transmission unit and an uplink reception unit, which are described below.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating a structure of a related art uplink transmission unit. As shown in fig. 1, the transmitting unit mainly includes:

the channel coding module 101 is configured to perform channel coding on an input information bit stream, and output a coded bit stream obtained after the channel coding to the constellation modulation module 102.

The constellation modulation module 102 is configured to perform constellation modulation on the coded bit stream input by the channel coding module 101, and output a time domain data stream obtained after constellation modulation to a fourier transform (DFT) module 103.

The constellation modulation module 102 modulates the coded bit stream obtained after channel coding by the planet seat, and the obtained data stream modulated by the constellation is in a time domain representation form, i.e. a time domain data stream. For convenience of subsequent description, it is assumed that a time domain data stream d obtained after constellation modulation is ═ d [0 ═ d]，d[1]，...，d[2M-1]]^TWherein, the 2M is the number of data in the time domain data stream, the^TIs transposed.

The DFT module 103 is configured to perform DFT on the time domain data stream input by the constellation modulation module 102 to obtain a frequency domain representation of the time domain data stream, that is, a frequency domain data stream, and output the frequency domain data stream to the STBC device 104.

Time domain data stream d ═ d [0 ═ d]，d[1]，...，d[2M-1]]^TAfter DFT, its frequency domain data stream is D ═ D [0 ═ D]，D[1]，...，D[2M-1]]^TWherein said D [0 ]]，D[1]，...，D[2M-1]Is d [0 ]]，d[1]，...，d[2M-1]The result of DFT (step (d)).

The STBC module 104 is configured to perform STBC on the frequency domain data stream input by the DFT module 103 to obtain a frequency domain coding sequence after STBC, and output the obtained frequency domain coding sequence to the resource mapping module 105.

When the STBC unit is used to STBC the frequency domain data stream, different STBC needs to be used in two adjacent transmission time periods T1 and T2, and each transmission time period needs to use two antennas for transmission.

In the time period T1, after the frequency domain data stream is STBC, the obtained STBC frequency domain coding sequence is D_T1 ¹And D_T1 ²I.e. the frequency-domain data stream D is encoded as D_T1 ¹And D_T1 ²Two sequences, the two frequency domain coding sequences D_T1 ¹And D_T1 ²Respectively as follows:

${\mathrm{<figure-callout\; id="1"\; label="D\; T"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">D</figure-callout>}}_T^1={\left[D\right[0],D[2],...,D[2M-2\left]\right]}^T,$

${\mathrm{<figure-callout\; id="1"\; label="D\; T"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">D</figure-callout>}}_T^1={\left[D\right[1],D[3],...,D[2M-1\left]\right]}^T,$

the specific STBC process is as follows:

${\mathrm{<figure-callout\; id="1"\; label="D\; T"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">D</figure-callout>}}_T^1\left(m_1\right)=D\left({2m}_1\right),$ wherein, said m ₁0, 1.., M-1, said D (2M)₁) Is the 2m of the frequency domain data stream D₁An element, said D_T1 ¹(m₁) Is sequence D_T1 ¹M of₁An element;

${\mathrm{<figure-callout\; id="1"\; label="D\; T"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">D</figure-callout>}}_T^1\left(m_2\right)=D({2m}_2+1),$ wherein, said m ₂0, 1.., M-1, said D (2M)₂+1) is the 2 m-th of the frequency-domain data stream D₂+1 elements, said D_T1 ²(m₂) Is sequence D_T1 ²M of₂And (4) each element.

In the time period T2, after the frequency domain data stream is STBC, the obtained STBC frequency domain coding sequence is D_T2 ¹And D_T2 ²I.e. the frequency-domain data stream D is encoded as D_T2 ¹And D_T2 ²Two sequences, the two frequency domain coding sequences D_T2 ¹And D_T2 ²Respectively as follows:

$D_{T2}^1={\left[{-D}^{*}\right[1],-D^{*}[2],...,-D^{*}[2M-1\left]\right]}^T,$

${\mathrm{<figure-callout\; id="1"\; label="D\; T"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">D</figure-callout>}}_T^1={\left[D^{*}\right[0],D^{*}[2],...,D^{*}[2M-2\left]\right]}^T,$

the specific STBC process is as follows:

${\mathrm{<figure-callout\; id="1"\; label="D\; T"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">D</figure-callout>}}_T^1\left(n_1\right)=-D^{*}({2\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">n</figure-callout>}}_1+1),$ wherein, said n ₁0, 1.., M-1, said^*For conjugation, the D (2 n)₁+1) is the 2 n-th data stream D in the frequency domain₁+1 elements, said D_T2 ¹(n₁) Is sequence D_T2 ¹N of (2)₁An element;

$D_{T2}^2\left(n_2\right)=D^{*}\left({2n}_2\right),$ wherein, said n ₂0, 1.., M-1, said D (2 n)₂) Is the 2 n-th of the frequency domain data stream D₂An element, said D_T2 ²(n₂) Is sequence D_T1 ²N of (2)₂And (4) each element.

A resource mapping module 105, configured to perform resource mapping on the frequency domain coding sequence input by the STBC 104, and output the frequency domain coding sequence after resource mapping to an Inverse Fast Fourier Transform (IFFT) module 106.

After the STBC 104 obtains the four frequency domain code sequences in two different time periods, only when the four frequency domain code sequences in the two time periods are arranged in the sequence of transmit diversity, it indicates that STBC is completed, and the subsequent processing procedure can be performed.

Whether the four sequences are in transmit diversity order can be identified as follows:

suppose the ith elements of sequence A, sequence B, sequence C and sequence D are respectively A [ i]、B[i]、C[i]And D [ i ]]When [ A [ i ] is satisfied]]^*[B[i]]^*+C[i]D[i]0 and [ A [ i ]]]^*[C[i]]^*+B[i]D[i]When the value is 0, it indicates that A, B, C and D are arranged in the order of transmit diversity.

From D_T1 ¹、D_T1 ²、D_T2 ¹And D_T2 ²It can be seen that the four frequency domain coded sequences are arranged in transmit diversity order, indicating that STBC over the two immediately adjacent time periods T1 and T2 has been completed. At this time, the two corresponding frequency domain coding sequences for completing STBC may be mapped to the uplink in the corresponding time period, so as to complete the resource mapping process for the two sequences.

An IFFT module 106, configured to perform IFFT on the frequency domain coding sequence after resource mapping input by the resource mapping module 105, and output the frequency domain coding sequence after IFFT to the transmitting module 107.

Similarly, the IFFT module also needs to perform IFFT on the frequency domain encoded sequence in time slots.

A transmitting module 107, configured to transmit the frequency domain coding sequence after IFFT input by the IFFT module 106.

And transmitting different frequency domain coding sequences after IFFT in different time periods until the frequency domain coding sequences after IFFT in two time periods are transmitted.

The whole process of uplink transmission in the SC-FDMA system by adopting the STBC transmission diversity technology is completed.

Fig. 2 is a schematic structural diagram of an uplink receiving unit corresponding to the uplink transmitting unit shown in fig. 1. As shown in fig. 2, the receiving unit mainly includes:

the receiving module 201 is configured to receive the frequency domain code sequence transmitted by the transmitting module 107, modulate the received signal back to the baseband, and output the modulated signal to the Fast Fourier Transform (FFT) module 202.

It should be noted that, each existing transmitting unit has only two transmitting modules, and the number of receiving modules in the receiving unit is not limited by the number of transmitting modules, and for convenience of description, it is assumed that N is provided_rA receiving module, wherein N_rNot less than 1. Regardless of the number of the transmitting modules, each transmitting module 201 needs to receive the frequency domain code sequence transmitted by the transmitting module 107.

An FFT module 202, configured to perform FFT on the signal input by the receiving module 201, and output the FFT-ed signal to a resource inverse mapping module 203.

A resource inverse mapping module 203, configured to perform resource inverse mapping on the FFT-performed signal input by the FFT module 202, and output frequency domain data obtained by the resource inverse mapping to the data restructuring module 204.

Likewise, for convenience of subsequent description, it is assumed that frequency domain data obtained after inverse mapping of resources on the p-th receiving module in the time period T1 is X_1，p＝[X_1，p[0]，X_1，p[1]，...，X_1，p[M-1]]^TThe frequency domain data obtained after inverse mapping of the resources on the p-th receiving module in the time period of T2 is X_2，p＝[X_2，p[0]，X_2，p[1]，...，X_2，p[M-1]]^TWherein, p is 1, 2_r。

The data reassembly module 204 is configured to rearrange and combine the frequency domain data obtained after inverse mapping of all the resources, and output the rearranged and combined frequency domain data to a multiple-input multiple-output frequency domain equalization (MIMO FDE) module 205.

After passing through the resource inverse mapping module 203, N in the time period of T1 is obtained respectively_rFrequency domain data and N in T2 time period_rFrequency domain data. For the convenience of subsequent processing, N in the two time periods are respectively used_rRecombining the frequency domain data to obtain 2M data with the size of N_rX 1 received signal vector

And

wherein, X is_1，[m]A received signal vector on the m-th subcarrier for a period of T1; said X_2，[m]A received signal vector on the m-th subcarrier for a period of T2; the received signal vectors on the same subcarrier in the two adjacent time periods T1 and T2 are rearranged as follows:

$X_{1,}\left[m\right]=H_1^1\left[m\right]D\left[2m\right]+H_1^2\left[m\right]D[2m+1]+N_1\left[m\right],$

$X_{2,}\left[m\right]=H_2^2\left[m\right]D^{*}\left[2m\right]-H_2^1\left[m\right]D^{*}[2m+1]+N_2\left[m\right],$

wherein, M is 0, 1₁ ^j[m]And H₂ ^j[m]Frequency domain channel response vectors, N, for the mth subcarrier on the jth transmitting module to all receiving modules during the T1 and T2 time periods, respectively₁[m]And N₂[m]White noise vectors of the receiving unit on the m-th subcarrier in the T1 time period and the T2 time period respectively, wherein the single-side energy spectrum density is N₀And j is 1, 2.

Further, the received signal vectors on the same subcarrier in two time periods can be simplified as follows:

where X [ m ] - + N [ m ] is H [ m ] D [ m ] - + N [ m ],

<math><mrow><mover><mi>X</mi><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><msup><mfenced open='[' close=']'><mtable><mtr><mtd><msubsup><mi>X</mi><mn>1</mn><mi>T</mi></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd><mtd><msubsup><mi>X</mi><mn>2</mn><mi>H</mi></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd></mtr></mtable></mfenced><mi>T</mi></msup><mo>,</mo></mrow></math> <math><mrow><mover><mi>H</mi><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><mfenced open='[' close=']'><mtable><mtr><mtd><msubsup><mi>H</mi><mn>1</mn><mn>1</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd><mtd><msubsup><mi>H</mi><mn>1</mn><mn>2</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd></mtr><mtr><mtd><msubsup><mi>H</mi><mn>2</mn><mrow><mn>2</mn><mo>*</mo></mrow></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd><mtd><mo>-</mo><msubsup><mi>H</mi><mn>2</mn><mrow><mn>1</mn><mo>*</mo></mrow></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd></mtr></mtable></mfenced><mo>,</mo></mrow></math> D[m]＝[D[2m]D[2m+1]]^T， <math><mrow><mover><mi>N</mi><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><msup><mfenced open='[' close=']'><mtable><mtr><mtd><msubsup><mi>N</mi><mn>1</mn><mi>T</mi></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd><mtd><msubsup><mi>N</mi><mn>2</mn><mi>H</mi></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd></mtr></mtable></mfenced><mi>T</mi></msup><mo>.</mo></mrow></math>

thus, the final received signal vector X m after passing through the data reconstruction module 204 is obtained.

A MIMO FDE module 205, configured to perform frequency domain equalization on the final received signal vector input by the data reassembly module 204, and output the soft estimation value after the frequency domain equalization to the data stream combining module 206.

When the final received signal vector X m after data rearrangement and combination is received, the mimo ofdm de module 205 performs frequency domain equalization on X m according to the following formula,

<math><mrow><mover><mi>D</mi><mo>~</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><msup><mi>W</mi><mi>H</mi></msup><mo>[</mo><mi>m</mi><mo>]</mo><mover><mi>X</mi><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>,</mo></mrow></math>

wherein, the

Is D [ m ]]Estimated value after frequency domain equalization, and $\tilde{D}\left[m\right]={\left[\begin{array}{cc}\tilde{D}\left[2m\right]& \tilde{D}[2m+1]\end{array}\right]}^T,$ the above-mentioned <math><mrow><mi>W</mi><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><mi>R</mi><msup><mrow><mo>[</mo><mi>m</mi><mo>]</mo></mrow><mrow><mo>-</mo><mn>1</mn></mrow></msup><mover><mi>H</mi><mover><mo>&OverBar;</mo><mo>^</mo></mover></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>,</mo></mrow></math> The above-mentioned <math><mrow><mi>R</mi><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><mover><mi>H</mi><mover><mo>&OverBar;</mo><mo>^</mo></mover></mover><mo>[</mo><mi>m</mi><mo>]</mo><msup><mover><mi>H</mi><mover><mo>&OverBar;</mo><mo>^</mo></mover></mover><mi>H</mi></msup><mo>[</mo><mi>m</mi><mo>]</mo><mo>+</mo><mfrac><mrow><mi>N</mi><mo>_</mo><mi>vscul</mi></mrow><mrow><mn>2</mn><mi>M</mi></mrow></mfrac><msub><mi>N</mi><mn>0</mn></msub><mi>I</mi><mo>,</mo></mrow></math> The above-mentioned

Is H [ m ]]The N _ vscul is the size of the IFFT performed by the transmitting unit.

And a data stream merging module 206, configured to merge the soft estimation values after frequency domain equalization, and output the merged soft estimation values to an inverse fourier transform (IDFT) module 207.

Soft estimate of frequency domain equalization by MIMO FDE module 205 $\tilde{D}\left[m\right]={\left[\begin{array}{cc}\tilde{D}\left[2m\right]& \tilde{D}[2m+1]\end{array}\right]}^T$ Is a data stream with length M, needs to be merged into a data stream with length 2M, and the merged data streamComprises the following steps:

$\tilde{D}={\left[\tilde{D}\right[0],\tilde{D}[1],...,\tilde{D}[2M-1\left]\right]}^T.$

the IDFT module 207 is configured to perform IDFT on the data stream with the length of 2M input by the data stream merging module 206, and output the data stream after IDFT to the constellation demodulation module 208.

The constellation demodulation module 208 is configured to demodulate the data stream after the IDFT input by the IDFT module 207 in the planet seat, and output the data stream after constellation demodulation to the channel decoding module 209.

A channel decoding module 209, configured to perform channel decoding on the data stream after constellation demodulation input by the constellation demodulation module 208, so as to obtain an information bit stream.

The whole process of uplink reception in the SC-FDMA system by using the STBC transmission diversity technology is completed.

Through the above analysis, the existing uplink transmission unit can only perform STBC in the frequency domain, but not in the time domain, and thus STBC can only be performed after DFT, but not before DFT, which limits flexibility of system design.

In addition, in the existing transmitting unit, only one antenna group, that is, the case of 2-antenna transmit diversity, is considered when performing multi-antenna transmit diversity, that is, only one information bit stream can be processed, and the cases of 2-antenna group, 3-antenna group, etc. with more than one antenna group are not considered. Therefore, the problem of Successive Interference (SIC) caused by multi-antenna transmit diversity is not considered in the prior art when receiving.

At present, downlink transmission can also be realized by means of the uplink transmission, so that the same disadvantages as the uplink transmission exist in terms of downlink transmission and reception, and are not repeated here.

Disclosure of Invention

In view of the above, a first object of the present invention is to provide a link transmitting unit in an SC-FDMA system, in which STBC can be performed not only in the frequency domain but also in the time domain, thereby improving flexibility of system design.

A second object of the present invention is to provide a space-time block code coder (STBC) in an SC-FDMA system, which is capable of coding a time-domain data stream.

A third object of the present invention is to provide a link receiving unit in an SC-FDMA system, in which STBC can be performed not only in the frequency domain but also in the time domain, thereby improving flexibility of system design.

A fourth object of the present invention is to provide a link transmission apparatus in an SC-FDMA system, in which STBC can be performed not only in the frequency domain but also in the time domain, thereby improving flexibility of system design.

A fifth object of the present invention is to provide a link transmission method in an SC-FDMA system, in which STBC can be performed not only in the frequency domain but also in the time domain, thereby improving flexibility of system design.

A sixth object of the present invention is to provide a space-time block code coding (STBC) method in an SC-FDMA system, by which a time-domain data stream can be encoded.

A seventh object of the present invention is to provide a link receiving method in an SC-FDMA system, in which STBC can be performed not only in the frequency domain but also in the time domain, thereby improving flexibility of system design.

An eighth object of the present invention is to provide a link transmission method in an SC-FDMA system, in which STBC can be performed not only in the frequency domain but also in the time domain, thereby improving flexibility of system design.

In order to achieve the above object, in a first aspect, the present invention provides a link transmitting unit in an SC-FDMA system, the unit including a channel coding module, a constellation modulation module, a DFT module, an STBC device, a resource mapping module, an IFFT module, and a transmitting module, wherein the unit further includes a data splitting module,

the data distribution module receives the time domain data stream input by the constellation modulation module for distribution, and outputs two time domain sub-data streams with the same data volume obtained after distribution to the DFT module in the first time period of two adjacent time periods, and the DFT module performs DFT processing on the two input time domain sub-data streams and outputs the two obtained frequency domain sub-data streams with the same data volume to the resource mapping module for resource mapping; in a second time period of the two adjacent time periods, outputting the two time domain sub-data streams with the same data volume to the STBC device, processing the two input time domain sub-data streams by using a first preset algorithm by the STBC device, outputting the two obtained time domain coding sequences with the same data volume and arranged in a transmission diversity sequence to the DFT module, and outputting the two obtained frequency domain coding sequences with the same data volume to the resource mapping module for resource mapping after performing DFT processing on the two input time domain coding sequences by the DFT module;

or, the data splitting module receives the time domain data stream input by the constellation modulation module for splitting, and outputs two time domain sub-data streams with the same data volume obtained after splitting to the DFT module in the first time period of two adjacent time periods, and the DFT module performs DFT processing on the two input time domain sub-data streams and outputs the two obtained frequency domain sub-data streams with the same data volume to the resource mapping module for resource mapping; in the second time slot of the two adjacent time slots, the two time domain sub-data streams with the same data volume obtained after the shunting are output to the DFT module, the DFT module performs DFT processing on the two input time domain sub-data streams, and then respectively outputs the two obtained frequency domain sub-data streams with the same data volume to the STBC device, the STBC device performs processing of a second predetermined algorithm on the two input frequency domain sub-data streams with the same data volume, and obtains two frequency domain coding sequences with the same data volume and arranged in the order of transmit diversity, and the two frequency domain coding sequences are output to the resource mapping module for resource mapping.

In order to achieve the above object, in a second aspect, the present invention provides an STBC apparatus in an SC-FDMA system, the STBC apparatus comprising:

the data stream processing module is used for respectively processing the first data stream and the second data stream into the conjugate of the original data stream and outputting the two processed data streams to the multiplication module;

the multiplication module is used for multiplying the two processed data streams input by the data stream processing module by the coding matrix P respectively, taking one data stream obtained after multiplication as a coding sequence, and outputting the other data stream obtained after multiplication to the negation module;

the negation module is used for negation operation of the other data stream input by the multiplication module to obtain another coding sequence,

wherein, the

The T is the length of each data stream input.

In order to achieve the above object, according to a third aspect of the present invention, there is provided a link receiving unit in an SC-FDMA system, the link receiving unit including a first data reassembly module, wherein the link receiving unit further includes K/m₀A layered processing module, wherein,

the first layered processing module receives the data which is output by the first data restructuring module and is used for rearranging and combining the frequency domain data after all resources are inversely mapped, and 2m is generated after frequency domain equalization and successive interference SIC elimination processing are carried out₀Outputting the information bit stream, and outputting the 2m₀The information bit stream is sent to the next layered processing module, and the next layered processing module processes the information bit stream and outputs 2m₀An information bit stream, and the 2m₀Sending the information bit stream to the next hierarchical processing module for processing until the K/m₀The last 2m is output after being processed by the layered processing module₀An information bit stream;

wherein, the K/m₀Each hierarchical processing module comprises: multiple-input multiple-output (MIMO) frequency domain equalization FDE module, second data reconstruction module and 2m₀An IDFT module, a third data reorganization module, and m₀Constellation demodulation module m₀A channel coding module from 1 st to Kth/m₀-the 1 hierarchical processing module further comprises: the device comprises a recoding module, a channel gain module and a SIC module;

the MIMO FDE module receives frequency domain data input from the outside of the hierarchical processing module where the MIMO FDE module is located, and sends the FDE-processed frequency domain data to the second data reconstruction module;

the second data restructuring module rearranges and combines the frequency domain data to generate 2m₀The frequency domain sub-data streams are respectively input into corresponding inverse Fourier transform (IDFT) modules; the IDFT module processes 2m after IDFT₀The frequency domain sub-data streams are output to a third data recombination module; the third data recombination module rearranges and combines the frequency domain sub-data to generate m₀The frequency domain data streams are respectively input to corresponding constellation demodulation modules; the constellation demodulation module outputs the data stream after constellation demodulation to the channel decoding module; the channel decoding module is used for decoding the channel-decoded 2m₀Outputting an information bit stream; the channel decoding module in the 1 st to Kth/m 0-1 st hierarchical processing modules also decodes the 2m₀Sending the information bit stream to a recoding module;

the recoding module comprises a channel coding module, a constellation modulation module, a data distribution module, a Fourier transform DFT module, a space-time block code coding STBC device and a fourth data recombination module, wherein the constellation modulation module receives m₀After constellation modulation is carried out on the data, a time domain data stream is formed and sent to a data distribution module; the data distribution module receives the time domain data stream input by the constellation modulation module for distribution, and outputs two time domain sub-data streams with the same data volume obtained after distribution to the STBC device; the STBC carries out processing of a first preset algorithm on two input time domain sub-data streams, and two obtained time domain coding sequences which have the same data volume and are sequentially arranged in a transmission diversity mode are output to the DFT module; after the DFT module carries out DFT processing on the two input time domain coding sequences, the two obtained frequency domain coding sequences with the same data quantity are output to the fourth data recombination module for rearrangement and combination;

or, the data splitting module receives the time domain data stream input by the constellation modulation module for splitting, and outputs two time domain sub-data streams with the same data volume obtained after splitting to the DFT module; after the DFT module performs DFT processing on the two input time domain sub-data streams, the two obtained frequency domain sub-data streams with the same data volume are respectively output to the STBC; the STBC device carries out processing of a second preset algorithm on two input frequency domain sub-data streams with the same data volume to obtain two frequency domain coding sequences with the same data volume and arranged in the sequence of the transmission diversity, and the two frequency domain coding sequences are output to the fourth data recombination module for rearrangement and combination;

the fourth data recombination module outputs the rearranged and combined frequency domain coding sequence to the channel gain module; the channel gain module carries out channel estimation on the received rearranged and combined frequency domain coding sequence and outputs the frequency domain coding sequence after the channel estimation to the SIC module;

the SIC module receives frequency domain data input from the outside of the hierarchical processing module, performs SIC processing on the frequency domain data and the frequency domain coding sequence received from the channel gain module, and sends the processed frequency domain data to a MIMO FDE module in the next hierarchical processing module, which is not the K/m th hierarchical processing module₀The frequency domain data is also sent to a SIC module in the next hierarchical processing module by each hierarchical processing module;

k is the total number of output information bit streams, m₀Is an integer divisible by K.

In order to achieve the fourth aspect of the above object, the present invention provides a link transmission apparatus in an SC-FDMA system, the apparatus comprising the link transmission unit of the first aspect and the link reception unit of the third aspect.

In order to achieve the fifth aspect of the above object, the present invention provides a link transmission method in an SC-FDMA system, applied to the transmission unit of the first aspect, the method including:

receiving and splitting the time domain data stream input by the constellation modulation module by a data splitting module, outputting two time domain sub-data streams with the same data volume obtained after splitting to the DFT module in the first time period of two adjacent time periods, and outputting two frequency domain sub-data streams with the same data volume obtained after DFT processing the two time domain sub-data streams by the DFT module to the resource mapping module for resource mapping; in the second time slot of the two adjacent time slots, the two time domain sub-data streams with the same data volume obtained after the splitting are output to the space-time block code coding STBC device, the STBC device carries out processing of a first preset algorithm on the two input time domain sub-data streams, the two obtained time domain coding sequences with the same data volume and arranged in the transmission diversity sequence are output to the Fourier transform DFT module, and after the DFT module carries out DFT processing on the two input time domain coding sequences, the two obtained frequency domain coding sequences with the same data volume are output to the resource mapping module for resource mapping;

or, the data splitting module receives the time domain data stream input by the constellation modulation module for splitting, and in the first time period of two adjacent time periods, outputs two time domain sub-data streams with the same data volume obtained after splitting to the DFT module, and after performing DFT processing on the two input time domain sub-data streams by the DFT module, outputs the two obtained frequency domain sub-data streams with the same data volume to the resource mapping module for resource mapping; in the second time period of the two adjacent time periods, the two time domain sub-data streams with the same data volume obtained after the shunting are output to the DFT module, the DFT module carries out DFT processing on the two input time domain sub-data streams, the two obtained frequency domain sub-data streams with the same data volume are respectively output to the STBC device, the STBC device carries out processing of a second preset algorithm on the two input frequency domain sub-data streams with the same data volume, the two obtained frequency domain coding sequences with the same data volume and arranged in the order of the transmission diversity are output to the resource mapping module for resource mapping.

In order to achieve the sixth aspect of the above object, the present invention provides a STBC method in an SC-FDMA system, the method comprising:

respectively processing the two data streams into conjugates of the original data streams to obtain two processed data streams;

multiplying the two processed data streams with a coding matrix P respectively, and taking one data stream obtained after multiplication as a coding sequence;

performing an inversion operation on the other data stream obtained after the multiplication to obtain another coding sequence, wherein the coding sequence is obtained

The T is the length of each data stream input.

In order to achieve the seventh aspect of the above object, the present invention provides a link receiving method in an SC-FDMA system, which is applied to the receiving unit of the third aspect, the method including:

the first layered processing module receives the data which is output by the first data restructuring module and is used for rearranging and combining the frequency domain data after all resources are inversely mapped, and 2m is generated after frequency domain equalization and SIC elimination processing are carried out₀Outputting the information bit stream, and outputting the 2m₀The information bit stream is sent to the next layered processing module, and the next layered processing module processes the information bit stream and outputs 2m₀An information bit stream, and the 2m₀Sending the information bit stream to the next hierarchical processing module for processing until the K/m₀The last 2m is output after being processed by the layered processing module₀An information bit stream;

wherein, the K/m₀Each hierarchical processing module comprises: multiple-input multiple-output (MIMO) frequency domain equalization FDE module, second data reconstruction module and 2m₀An IDFT module, a third data reorganization module, and m₀Individual constellation demodulation module, m₀A channel coding module from 1 st to Kth/m₀-the 1 hierarchical processing module further comprises: the system comprises a recoding module, a channel gain module and a continuous interference SIC module;

the MIMO FDE module receives frequency domain data input from the outside of the hierarchical processing module where the MIMO FDE module is located, and sends the FDE-processed frequency domain data to the second data reconstruction module;

the second data reconstruction module rearranges and combines the frequency domain data to generate 2m₀The frequency domain sub-data streams are respectively input into corresponding inverse Fourier transform (IDFT) modules; the IDFT module is used for processing the 2m subjected to IDFT₀The frequency domain sub-data streams are output to a third data recombination module; the third data recombination module rearranges and combines the frequency domain subdata to generate m₀The frequency domain data streams are respectively input to corresponding constellation demodulation modules; the data stream after constellation demodulation is output to a channel decoding module by a constellation demodulation module; channel-decoded 2m by a channel decoding module₀Outputting an information bit stream; from the 1 st to the Kth/m₀-the channel decoding module of the 1 layered processing modules further decodes the 2m₀Sending the information bit stream to a recoding module;

the recoding module comprises a channel coding module, a constellation modulation module, a data distribution module, a Fourier transform DFT module, a space-time block code coding STBC device and a fourth data recombination module, wherein the constellation modulation module receives m₀After constellation modulation is carried out on the data, a time domain data stream is formed and sent to a data distribution module; the data distribution module receives the time domain data stream input by the constellation modulation module for distribution, and outputs two time domain sub-data streams with the same data volume obtained after distribution to the STBC device; the STBC carries out processing of a first preset algorithm on the two input time domain sub-data streams, and two obtained time domain coding sequences which have the same data volume and are sequentially arranged in a transmission diversity mode are output to the DFT module; after the DFT module carries out DFT processing on the two input time domain coding sequences, the two obtained frequency domain coding sequences with the same data quantity are output to the fourth data recombination module for rearrangement and combination;

or, the data splitting module receives the time domain data stream input by the constellation modulation module for splitting, and outputs two time domain sub-data streams with the same data volume obtained after splitting to the DFT module; after DFT processing is carried out on the two input time domain sub-data streams by a DFT module, the two obtained frequency domain sub-data streams with the same data volume are respectively output to the STBC device; the STBC carries out processing of a second preset algorithm on two input frequency domain sub-data streams with the same data volume to obtain two frequency domain coding sequences with the same data volume and arranged in the sequence of the transmission diversity, and the two frequency domain coding sequences are output to the fourth data recombination module for rearrangement and combination;

outputting, by the fourth data reassembly module, the rearranged and combined frequency-domain encoded sequences to a channel gain module; the channel gain module carries out channel estimation on the received rearranged and combined frequency domain coding sequence and then outputs the frequency domain coding sequence after the channel estimation to the SIC module;

the SIC module receives frequency domain data input from the outside of the hierarchical processing module, carries out SIC processing on the frequency domain data and the frequency domain coding sequence received from the channel gain module, and sends the processed frequency domain data to the MIMO FDE module in the next hierarchical processing module, namely the non-Kth/m-th hierarchical processing module₀The frequency domain data is also sent to a SIC module in the next hierarchical processing module by each hierarchical processing module;

k is the total number of output information bit streams, m₀Is an integer divisible by K.

In order to achieve the eighth aspect of the above object, the present invention provides a link transmission method in an SC-FDMA system, which includes the link transmission method of the fifth aspect and the link transmission method of the seventh aspect.

As can be seen from the above technical solutions, the link transmission apparatus and method in the SC-FDMA system according to the present invention add a data splitting module to a link sending unit, so that a time domain sub-data stream obtained after splitting can be first converted into a frequency domain sub-data stream and then STBC is performed on the frequency domain sub-data stream, or STBC is directly performed on the time domain sub-data stream, which not only can perform STBC in the frequency domain, but also can perform STBC in the time domain, and thus STBC can be performed after DFT or before DFT, thereby improving flexibility of system design.

Drawings

Fig. 1 is a schematic diagram of a structure of a prior art uplink transmission unit.

Fig. 2 is a schematic diagram of a structure of a prior art uplink receiving unit.

Fig. 3 is a schematic structural diagram of a link transmitting unit according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a space-time block code (STBC) encoder according to an embodiment of the present invention.

Fig. 5 is a flow chart of a transmission process of a link transmitting unit according to an embodiment of the invention.

Fig. 6 is a schematic structural diagram of a link receiving unit according to an embodiment of the present invention.

FIG. 7 is a block diagram of a re-encoding module in the embodiment shown in FIG. 6.

Fig. 8 is a receiving flow chart of the link receiving unit according to an embodiment of the invention.

Fig. 9 is a schematic structural diagram of a link transmitting unit according to a second embodiment of the present invention.

Fig. 10 is a flowchart of a link transmitting unit according to a second embodiment of the present invention.

Fig. 11 is a schematic structural diagram of a re-encoding module in a two-link receiving unit according to an embodiment of the present invention.

Detailed Description

In order to solve the problems in the prior art, the invention provides a new link transmission device in an SC-FDMA system, that is, a data splitting module is added in a link sending unit, and the addition of the data splitting module enables a time domain sub-data stream obtained after splitting to be converted into a frequency domain sub-data stream firstly and then subjected to STBC on the frequency domain sub-data stream, and also enables the time domain sub-data stream to be subjected to STBC directly, so that the STBC can be performed not only in the frequency domain but also in the time domain, and further the STBC can be performed after DFT or before DFT, thereby improving the flexibility of system design.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.

Example one

In this embodiment, STBC is performed before DFT, which is shown in the schematic structural diagram of the link transmitting unit shown in fig. 3. As shown in fig. 3, the transmission unit includes:

the channel coding module 301 is configured to perform channel coding on an input information bit stream, and output a coded bit stream obtained after the channel coding to the constellation modulation module 302.

The constellation modulation module 302 is configured to modulate the coded bit stream after channel coding input by the channel coding module 301 with a planet carrier, and output a time domain data stream obtained after constellation modulation to the data splitting module 303.

As in the prior art, in this embodiment, the obtained constellation-modulated data stream is also a time domain data stream, and in order to compare with the existing STBC process, assuming that the number of data in the time domain data stream on the kth antenna is the same as the number of data in the time domain data stream in the prior art, the time domain data stream d is made to be the same_k＝[d_k[0]，d_k[1]，...，d_k[2M-1]]^TAnd k is the serial number of the antenna group, and 2M is the number of data in the time domain data stream.

The data splitting module 303 is configured to split the time domain data stream input by the constellation modulation module 302, and output two time domain sub-data streams with the same data volume obtained after splitting to the STBC 304.

In this embodiment, because the 2-antenna transmit diversity method is adopted, when there is data to be transmitted on one antenna, the corresponding data on the other antenna is also transmitted, that is, the data amount on the two antennas is always kept consistent. Thus, for the time domain data stream d_kWhen the flow is divided, d is required to be divided_kThe time domain sub-data streams are equally divided into two time domain sub-data streams with the same data volume, and the specific implementation mode can be as follows: optionally take d_kAs one time domain sub-data stream d_k1The remaining part is used as another time domain sub-data stream d_k2。

For convenience of implementation, in the present embodiment, the time domain data stream d is used_k＝[d_k[0]，d_k[1]，...，d_k[2M-1]]^TPerforming parity grouping to obtain odd sub-data stream d_k ^oAnd even sub-stream d_k ^eTwo time domain sub-data streams, and using the two time domain sub-data streams as d respectively_k1And d_k2The two sub-time domain sub-data streams are,

$d_k^o={\left[\right[d_k^o\left[0\right],d_k^o\left[1\right],...,d_k^o[M-1]]}^T={\left[d_k\right[0],d_k[2],...,d_k[2M-2\left]\right]}^T,$

$d_k^e={\left[\right[d_k^e\left[0\right],d_k^e\left[1\right],...,d_k^e[M-1]]}^T={\left[d_k\right[1],d_k[3],...,d_k[2M-1\left]\right]}^T.$

another convenient implementation is to take d_kFirst half data d of_{k front}As a time domain sub-data stream d_k1Second half data d_{k is back}As another time-domain sub-stream d_k2In practice, other shunting manners may be adopted, so as not to affect the implementation of the embodiment of the present invention.

The STBC 304 is configured to perform a first predetermined algorithm on the two time domain sub-data streams with the same data volume input by the data splitting module 303, and output two time domain coding sequences obtained after the first predetermined algorithm processing to the DFT module 305.

It should be noted that, in this embodiment, in two adjacent transmission time periods T1 and T2, different processing manners are respectively adopted for two time domain sub-data streams with the same data amount after splitting, and the processing manners of the two time periods may be interchanged, and the specific processing procedure is illustrated below.

In a time period of T1, STBC is not performed on the time domain sub-data stream after being split, and two time domain sub-data streams d with the same data volume obtained after being split are directly subjected to STBC_k1And d_k2Output to the DFT module 305.

In a time period of T2, two time domain sub-data streams with the same data volume after being split are processed by a first predetermined algorithm, and then two time domain coding sequences can be obtained, and different time domain coding sequences can be obtained if the specific processing procedures are different. In this embodiment, the specific processing procedure is as follows: for two time domain sub-data streams d_k1And d_k2Coding by using a coding matrix P to obtain two time domain coding sequences d_k ¹And d_k ²，

$d_{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}^1=P{\left[{\left[d_{k1}\right]}^H\right]}^T,$

$d_k^2=-P{\left[{\left[d_{k2}\right]}^H\right]}^T,$

Wherein, the

The above-mentioned^HIs a conjugate transpose.

The two code sequences d_k ¹And d_k ²Respectively as follows:

$d_{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}^1={[d_{k1}{\left[0\right]}^{*},d_{k1}{[M-1]}^{*},d_{k1}{[M-2]}^{*},...,d_{k1}{\left[1\right]}^{*}]}^T,$

$d_k^2={[-d_{k2}{\left[0\right]}^{*},{-d}_{k2}{[M-1]}^{*},{-d}_{k2}{[M-2]}^{*},...,{-d}_{k2}{\left[1\right]}^{*}]}^T.$

referring to fig. 4, the STBC device using the above process mainly includes, as shown in fig. 4:

a data stream processing module 401, configured to process the two input data streams respectively, and output the two processed data streams to the multiplication module 402 respectively.

The two data streams are respectively processed in such a way that certain operation is performed on the two data streams, and the two processed data streams are respectively data stream 1 conjugate and data stream 2 conjugate.

A multiplying module 402, configured to multiply the two processed data streams input by the data stream processing module 401 with the coding matrix P, respectively, and output one of the results after operation to the negating module 403.

After the two processed data streams are multiplied by the coding matrix P, respectively, one output data stream after calculation is used as a coding sequence, and the other data stream is output to the negation module 403.

And an negation module 403, configured to perform negation operation on the result obtained by multiplying the input signal by the multiplication module 402, so as to obtain a code sequence.

It should be noted that, in this embodiment, the adopted coding matrix is:

and T is the length of the input data stream.

It should be further noted that, in this embodiment, various operations performed on the data stream 1 and the data stream 2 may be interchanged without affecting the implementation of the embodiment of the present invention.

Thus, the STBC device used in the present invention was obtained.

Similarly, in this embodiment, other first predetermined algorithm implementation processes may also be adopted, that is, other STBC devices may be adopted, and in practice, the implementation of the embodiment of the present invention is not affected.

It should be noted that, the above is only described by taking the case where STBC is not performed in the T1 time period and STBC is performed in the T2 time period as an example, STBC may also be performed in the T1 time period and STBC is not performed in the T2 time period to implement the complete STBC process of the embodiment, which practically does not affect the implementation of the embodiment of the present invention.

The DFT module 305 is configured to perform DFT on the two time domain coding sequences input by the STBC device 304 to obtain a frequency domain representation of the time domain coding sequences, that is, a frequency domain coding sequence, and output the frequency domain coding sequence to the resource mapping module 306.

Since different processing manners are adopted for the two sub-data streams in two adjacent different time periods in the STBC device 304, in this embodiment, different processing results in the two time periods also need to be processed respectively.

Within the time period T1, two time-domain sub-data streams d without any encoding are encoded_k1And d_k2Directly and respectively performing DFT to obtain two sub-data streams d_k1And d_k2Frequency domain representation of D_k1And D_k2Then, D can be_k1And D_k2Input into the resource mapping module 306. How to perform DFT specifically is the prior art, and therefore, it is not described herein again.

In the time period of T2, the time domain coding sequence d after STBC is processed_k ¹And d_k ²Respectively carrying out DFT to obtain frequency domain coding sequences D_k ¹And D_k ²Respectively as follows:

${\mathrm{<figure-callout\; id="1"\; label="D\; k"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">D</figure-callout>}}_k^{}={[{\left[D_{k1}\right[0\left]\right]}^{*},{\left[D_{k1}\right[1\left]\right]}^{*},...,{\left[D_{k1}\right[M-2\left]\right]}^{*},{\left[D_{k1}\right[M-1\left]\right]}^{*}]}^T,$

$D_k^2={[-{\left[D_{k2}\right[0\left]\right]}^{*},{-\left[D_{k2}\right[1\left]\right]}^{*},...,{-\left[D_{k2}\right[M-2\left]\right]}^{*},{-\left[D_{k2}\right[M-1\left]\right]}^{*}]}^T,$

wherein, D is_k1[0]，D_k1[1]，...，D_k1[M-1]Is d_k1[0]，d_k1[1]，...，d_k1[M-1]DFT result of (1), said D_k2[0]，D_k2[1]，...，D_k2[M-1]Is d_k2[0]，d_k2[1]，...，d_k2[M-1]The result of DFT (step (d)).

Likewise, in the present embodiment, if STBC is performed during the T1 time period and STBC is not performed during the T2 time period, the time after STBC is performed during the T1 time period needs to be compared in the DFT module 305Domain coding sequence d_k ¹And d_k ²DFT is performed separately, and two sub-data streams d without any encoding are subjected to a time period T2_k1And d_k2The DFT is directly and respectively carried out.

From D_k1、D_k2、D_k ¹And D_k ²As can be seen from the expression of (A), D_k1、D_k2、D_k ¹And D_k ²The four sequences are arranged in transmit diversity order, i.e., STBC for SC-FDMA system is completed. The specific determination method of the transmit diversity order arrangement is the same as the prior art, and is not described herein again.

It should be noted that, because the processing procedure of the first predetermined algorithm is different, the obtained four frequency domain code sequences have different expressions, regardless of their expressions, as long as the four frequency domain code sequences are arranged in the transmission diversity order, which indicates that the processing procedure of the first predetermined algorithm is completed.

A resource mapping module 306, configured to perform resource mapping on the frequency domain coding sequence input by the DFT module 305, and output the frequency domain coding sequence after resource mapping to the IFFT module 307.

How to perform resource mapping on the frequency domain coding sequence is the prior art, and details thereof are not described here.

An IFFT module 307, configured to perform IFFT on the frequency domain coding sequence after resource mapping input by the resource mapping module 306, and output the frequency domain coding sequence after IFFT to the transmitting module 308.

A transmitting module 308, configured to transmit the frequency domain coding sequence after IFFT input by the IFFT module 307.

Thus, the link sending unit adopted in the embodiment is obtained.

It should be noted that, in this embodiment, the specific operations of the channel coding module 301, the constellation modulation module 302, the resource mapping module 306, the IFFT module 307, and the transmitting module 308 are respectively the same as those of the existing channel coding module 101, the constellation modulation module 102, the resource mapping module 105, the IFFT module 106, and the transmitting module 107, and therefore, the detailed description thereof is omitted in this embodiment. The number of the channel coding modules 301, the constellation modulation modules 302, the data splitting modules 303 and the STBC devices 304 is the same as that of the plurality of the channel coding modules 301, the number of the DFT modules 305, the resource mapping modules 306 and the IFFT modules 307 is four times that of the channel coding modules 301, and the number of the transmitting modules 308 is twice that of the channel coding modules 301.

It should be noted that, this embodiment is only described by taking the processing of the information bit stream k by the kth antenna group as an example. In practice, if there are multiple information bit streams, the multiple information bit streams are processed in parallel, each information bit stream is transmitted on a respective antenna group, and the information bit streams on other antenna groups are not affected during transmission, and are not affected by the information bit streams on other antennas.

Fig. 5 is a transmission flow chart corresponding to the transmitting unit shown in fig. 3, and as shown in fig. 5, the flow includes:

step 501: a stream of information bits to be processed is input.

Step 502: and carrying out channel coding on the input information bit stream to obtain a coded bit stream subjected to channel coding.

Step 503: and modulating the coded bit stream obtained after channel coding by a planet seat to obtain a time domain data stream modulated by a constellation.

As in the prior art, in this embodiment, the obtained constellation-modulated data stream is also a time domain data stream, and in order to compare with the existing STBC process, assuming that the number of data in the time domain data stream on the kth antenna is the same as the number of data in the time domain data stream in the prior art, the time domain data stream d is made to be the same_k＝[d_k[0]，d_k[1]，...，d_k[2M-1]]^TWherein, k is the serial number of the antenna group, and 2M is the data in the time domain data streamThe number of (2).

Step 504: and splitting the time domain data stream obtained after constellation modulation to obtain two time domain sub-data streams with the same data volume after splitting.

In this embodiment, because the 2-antenna transmit diversity method is adopted, when there is data to be transmitted on one antenna, the corresponding data on the other antenna is also transmitted, that is, the data amount on the two antennas is always kept consistent. Thus, for the time domain data stream d_kWhen the flow is divided, d is required to be divided_kThe time domain sub-data streams are equally divided into two time domain sub-data streams with the same data volume, and the specific implementation mode can be as follows: optionally take d_kAs one time domain sub-data stream d_k1The remaining part is used as another time domain sub-data stream d_k2。

For the convenience of implementation, in this embodiment, parity grouping is performed on the time domain data stream to obtain the odd sub-data stream d_k ^oAnd even sub-stream d_k ^eAnd (3) realizing two time domain sub-data streams with the same data quantity.

It should be noted that, when performing STBC, different processing procedures are adopted for the two time domain sub-data streams with the same data size obtained after splitting in different time periods T1 and T2, and the specific processing procedures of the two time periods may be interchanged, which does not affect the implementation of the embodiment of the present invention. The following explains the specific processing procedure by taking as an example the operations of step 505 to step 508 performed in the time period T1 and the operations of step 509 to step 513 performed in the time period T2.

The specific processing procedure of the time period T1 is as follows:

step 505: and respectively carrying out DFT on the two time domain sub-data streams with the same data quantity obtained after the shunting to obtain two frequency domain sub-data streams.

For two time domain sub-data streams d without any coding_k1And d_k2Directly and respectively performing DFT to obtain two subdataStream d_k1And d_k2Frequency domain representation of D_k1And D_k2Specifically, how to perform DFT is the prior art, and is not described herein again.

Step 506: and performing resource mapping on the frequency domain sub-data stream obtained after DFT to obtain the frequency domain sub-data stream after resource mapping.

Step 507: and performing IFFT on the frequency domain sub-data stream subjected to resource mapping to obtain the frequency domain sub-data stream subjected to IFFT.

Step 508: and transmitting the frequency domain sub-data stream after IFFT.

At this point, the specific processing procedure in the time period T1 is completed.

The specific treatment process in the time period T2 is as follows:

step 509: and carrying out first preset STBC (space time block coding) processing on the two time domain sub-data streams with the same data volume obtained after shunting to obtain a time domain coding sequence.

For the divided two time domain sub-data streams d_k1And d_k2And processing the first preset STBC to obtain two time domain coding sequences, wherein different time domain coding sequences can be obtained by different preset STBC processes. In this embodiment, the specific STBC process is: for two time domain sub-data streams d_k1And d_k2Coding by using a coding matrix P to obtain two time domain coding sequences d_k ¹And d_k ²，

$d_{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}^1=P{\left[{\left[d_{k1}\right]}^H\right]}^T,$

$d_k^2=-P{\left[{\left[d_{k2}\right]}^H\right]}^T,$

Wherein, theAnd H is conjugate transpose.

The two code sequences d_k ¹And d_k ²Respectively as follows:

$d_{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">k</figure-callout>}}^1={[d_{k1}{\left[0\right]}^{*},d_{k1}{[M-1]}^{*},d_{k1}{[M-2]}^{*},...,d_{k1}{\left[1\right]}^{*}]}^T,$

$d_k^2={[-d_{k2}{\left[0\right]}^{*},{-d}_{k2}{[M-1]}^{*},{-d}_{k2}{[M-2]}^{*},...,{-d}_{k2}{\left[1\right]}^{*}]}^T.$

it should be noted that in the present embodiment, other STBC may be adopted, so as not to affect the implementation of the embodiment of the present invention.

Step 510: and performing DFT on the time domain coding sequence to obtain a frequency domain coding sequence.

For the time domain coding sequence d after STBC_k ¹And d_k ²Respectively carrying out DFT to obtain frequency domain coding sequences D_k ¹And D_k ²Respectively as follows:

${\mathrm{<figure-callout\; id="1"\; label="D\; k"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">D</figure-callout>}}_k^{}={[{\left[D_{k1}\right[0\left]\right]}^{*},{\left[D_{k1}\right[1\left]\right]}^{*},...,{\left[D_{k1}\right[M-2\left]\right]}^{*},{\left[D_{k1}\right[M-1\left]\right]}^{*}]}^T,$

$D_k^2={[-{\left[D_{k2}\right[0\left]\right]}^{*},{-\left[D_{k2}\right[1\left]\right]}^{*},...,{-\left[D_{k2}\right[M-2\left]\right]}^{*},{-\left[D_{k2}\right[M-1\left]\right]}^{*}]}^T,$

wherein, D is_k1[0]，D_k1[1]，...，D_k1[M-1]Is d_k1[0]，d_k1[1]，...，d_k1[M-1]DFT result of (1), said D_k2[0]，D_k2[1]，...，D_k2[M-1]Is d_k2[0]，d_k2[1]，...，d_k2[M-1]The result of DFT (step (d)).

Step 511: and carrying out resource mapping on the frequency domain coding sequence to obtain the frequency domain coding sequence after resource mapping.

Step 512: and performing IFFT on the frequency domain coding sequence after the resource mapping to obtain the frequency domain coding sequence after IFFT.

Step 513: and transmitting the frequency domain coding sequence after the IFFT.

At this point, the specific processing procedure in the time period T2 is completed.

After the specific operations in the time periods T1 and T2 are completed, the whole transmission flow of the link transmission unit adopted in the first embodiment of the present invention is completed.

It should be noted that, in the description of the flow described in this embodiment, only one information bit stream is taken as an example for explanation, when there are several information bit streams, these several information bit streams are processed in parallel, and their respective processing procedures do not affect the processing of other information bit streams, nor are they affected by other information bit streams.

Fig. 6 is a schematic structural diagram of a link receiving unit corresponding to the link transmitting unit in this embodiment. As shown in fig. 6, the receiving unit includes:

the receiving module 601 is configured to receive all the frequency domain coding sequences transmitted by the transmitting module 308, modulate the received signal back to the baseband, and output the modulated signal to the FFT module 602.

As in the prior art, the number of receiving modules in the receiving unit of this embodiment is not limited by the number of transmitting modules, and for comparison with the prior art, it is assumed that N is also present in this embodiment_rA receiving module.

An FFT module 602, configured to perform FFT on the signal input by the receiving module 601, and output the FFT signal to a resource inverse mapping module 603.

A resource inverse mapping module 603, configured to perform resource inverse mapping on the FFT-performed signal input by the FFT module 602, and output frequency-domain data obtained by the resource inverse mapping to the first data reassembly module 604.

For comparison with the conventional receiving unit, in this embodiment, it is also assumed that the frequency domain data obtained by inverse mapping the resource on the p-th receiving module in the time period T1 is X_1，p＝[X_1，p[0]，X_1，p[1]，...，X_1，p[M-1]]^TThe frequency domain data obtained after inverse mapping of the resources on the p-th receiving module in the time period of T2 is X_2，p＝[X_2，p[0]，X_2，p[1]，...，X_2，p[M-1]]^T。

The first data reassembly module 604 is configured to rearrange and combine the frequency domain data obtained after inverse mapping of all the resources, and output the rearranged and combined frequency domain data to the MIMO FDE module 605.

As in the prior art, in this embodiment, after passing through the resource inverse mapping module 603, N in the time period T1 is also obtained respectively_rFrequency domain data and N in T2 time period_rFrequency domain data. Likewise, for the convenience of subsequent processing, N in the two time periods are respectively used_rRecombining the frequency domain data to obtain 2M data with the size of N_rX 1 received signal vectorAnd

wherein, X is_1，[m]A received signal vector on the m-th subcarrier for a period of T1; said X_2，[m]A received signal vector on the m-th subcarrier for a period of T2; and rearrange the received signal vectors on the same sub-carrier in the two time periods as follows:

<math><mrow><msub><mi>X</mi><mrow><mn>1</mn><mo>,</mo></mrow></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><munderover><mi>&Sigma;</mi><mrow><mi>k</mi><mo>=</mo><mn>1</mn></mrow><mi>K</mi></munderover><mrow><mo>(</mo><msubsup><mi>H</mi><mrow><mn>1</mn><mo>,</mo><mi>k</mi></mrow><mn>1</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><msubsup><mi>D</mi><mi>k</mi><mn>1</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><mo>+</mo><msubsup><mi>H</mi><mrow><mn>1</mn><mo>,</mo><mi>k</mi></mrow><mn>2</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><msubsup><mi>D</mi><mi>k</mi><mn>2</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><mo>)</mo></mrow><mo>+</mo><msub><mi>N</mi><mn>1</mn></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>,</mo></mrow></math>

<math><mrow><msub><mi>X</mi><mrow><mn>2</mn><mo>,</mo></mrow></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><munderover><mi>&Sigma;</mi><mrow><mi>k</mi><mo>=</mo><mn>1</mn></mrow><mi>K</mi></munderover><mrow><mo>(</mo><msubsup><mi>H</mi><mrow><mn>2</mn><mo>,</mo><mi>k</mi></mrow><mn>2</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><msubsup><mi>D</mi><mi>k</mi><msup><mn>1</mn><mo>*</mo></msup></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><mo>-</mo><msubsup><mi>H</mi><mrow><mn>2</mn><mo>,</mo><mi>k</mi></mrow><mn>1</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><msubsup><mi>D</mi><mi>k</mi><msup><mn>2</mn><mo>*</mo></msup></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><mo>)</mo></mrow><mo>+</mo><msub><mi>N</mi><mn>2</mn></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>,</mo></mrow></math>

wherein, M is 0, 1₁ ^j[m]And H₂ ^j[m]Frequency domain channel response vectors from the mth subcarrier of the kth antenna group to all receiving modules corresponding to the jth transmitting module in the T1 and T2 time periods, respectively, N₁[m]And N₂[m]White noise vectors of the receiving unit on the m-th subcarrier in the T1 time period and the T2 time period respectively, wherein the single-side energy spectrum density is N₀And j is 1, 2.

Further, the received signal vectors on the same subcarrier in two time periods can be simplified as follows:

<math><mrow><mover><msub><mi>X</mi><mn>1</mn></msub><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><munderover><mi>&Sigma;</mi><mrow><mi>k</mi><mo>=</mo><mn>1</mn></mrow><mi>K</mi></munderover><msub><mover><mi>H</mi><mo>&OverBar;</mo></mover><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><msub><mi>D</mi><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>+</mo><mover><mi>N</mi><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>,</mo></mrow></math> wherein,

<math><mrow><msub><mover><mi>X</mi><mo>&OverBar;</mo></mover><mn>1</mn></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><msup><mfenced open='[' close=']'><mtable><mtr><mtd><msubsup><mi>X</mi><mn>1</mn><mi>T</mi></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd><mtd><msubsup><mi>X</mi><mn>2</mn><mi>H</mi></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd></mtr></mtable></mfenced><mi>T</mi></msup><mo>,</mo></mrow></math> <math><mrow><msub><mover><mi>H</mi><mo>&OverBar;</mo></mover><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><mfenced open='[' close=']'><mtable><mtr><mtd><msubsup><mi>H</mi><mrow><mn>1</mn><mo>,</mo><mi>k</mi></mrow><mn>1</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd><mtd><msubsup><mi>H</mi><mrow><mn>1</mn><mo>,</mo><mi>k</mi></mrow><mn>2</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd></mtr><mtr><mtd><msubsup><mi>H</mi><mrow><mn>2</mn><mo>,</mo><mi>k</mi></mrow><msup><mn>2</mn><mo>*</mo></msup></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd><mtd><mo>-</mo><msubsup><mi>H</mi><mrow><mn>2</mn><mo>,</mo><mi>k</mi></mrow><msup><mn>1</mn><mo>*</mo></msup></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd></mtr></mtable></mfenced><mo>,</mo></mrow></math> $D_k\left[m\right]={\left[\begin{array}{cc}{D}_k^1\left[m\right]& D_k^2\left[m\right]\end{array}\right]}^T,$ <math><mrow><mover><mi>N</mi><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><msup><mfenced open='[' close=']'><mtable><mtr><mtd><msubsup><mi>N</mi><mn>1</mn><mi>T</mi></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd><mtd><msubsup><mi>N</mi><mn>2</mn><mi>H</mi></msubsup><mo>[</mo><mi>m</mi><mo>]</mo></mtd></mtr></mtable></mfenced><mi>T</mi></msup><mo>.</mo></mrow></math>

thus, the final received signal vector X after passing through the first data reconstruction module 604 is obtained₁[m]。

It should be noted that, in this embodiment, since the transmitting unit has a plurality of input data streams, and there is interference among a plurality of transmission data streams in the receiving unit, the receiving unit needs to perform frequency domain equalization on the input signal vector and also needs to cancel interference among a plurality of data streams, and this embodiment adopts hierarchical frequency domain equalization and SIC cancellation, and it is assumed that the frequency domain equalization and the SIC cancellation share K/m₀A layered processing module, i.e. having a total of K/m₀Each layer processing module comprises a MIMO FDE module 605, a second data reconstruction module 606 and a 2m layer₀ An IDFT module 607, a third data reorganization module 608, m₀ Constellation demodulation module 609, m₀A channel decoding module 610, a re-encoding module 611, a channel gain module 612 and a SIC module 613, wherein m is₀Is an integer divisible by K, as follows for m₀The selection process of (a) is described in detail.

Let the original transmitted signal vector be $d_k\left[i\right]={\left[d_k^1\right[i],d_k^2[i\left]\right]}^T,$ The signal vector after frequency domain equalization is ${\tilde{d}}_k\left[i\right]={\left[{\tilde{d}}_k^1\right[i],{\tilde{d}}_k^2[i\left]\right]}^T,$ Then the minimum mean square error is ${\mathrm{MSE}}_k={\left|\right|{\tilde{d}}_k\left[i\right]-d_k\left[i\right]\left|\right|}^2,$ That is to say ${\mathrm{MSE}}_k=E\left[\left({\tilde{d}}_k\right[i]-d_k[i\left]\right){\left({\tilde{d}}_k\right[i]-d_k[i\left]\right)}^H\right]=J_k,$ Further, the air conditioner is provided with a fan, <math><mrow><msub><mi>J</mi><mi>k</mi></msub><mo>=</mo><msub><mi>I</mi><mn>2</mn></msub><mo>-</mo><mfrac><mn>1</mn><mi>M</mi></mfrac><munderover><mi>&Sigma;</mi><mrow><mi>n</mi><mo>=</mo><mn>0</mn></mrow><mrow><mi>M</mi><mo>-</mo><mn>1</mn></mrow></munderover><msubsup><mover><mi>H</mi><mover><mo>&OverBar;</mo><mo>^</mo></mover></mover><mi>k</mi><mi>H</mi></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><msup><mi>R</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mo>[</mo><mi>m</mi><mo>]</mo><msub><mover><mi>H</mi><mover><mo>&OverBar;</mo><mo>^</mo></mover></mover><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>,</mo></mrow></math> thereby, J is enabled_kMinimum m₀The value is obtained, said

The above-mentioned <math><mrow><mi>R</mi><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><munder><mi>&Sigma;</mi><mi>k</mi></munder><msub><mover><mi>H</mi><mover><mo>&OverBar;</mo><mo>^</mo></mover></mover><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><msubsup><mover><mi>H</mi><mover><mo>&OverBar;</mo><mo>^</mo></mover></mover><mi>k</mi><mi>H</mi></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><mo>+</mo><mfrac><mrow><mi>N</mi><mo>_</mo><mi>vscul</mi></mrow><mrow><msup><mi>&alpha;</mi><mn>2</mn></msup><mi>M</mi></mrow></mfrac><msub><mi>N</mi><mn>0</mn></msub><mi>I</mi><mo>,</mo><mi>i</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mi>M</mi><mo>-</mo><mn>1</mn><mo>.</mo></mrow></math>

It should be noted that, since the sending unit sends through two adjacent time periods, the receiving unit necessarily receives through two adjacent time periods, and therefore, m is located in each time period on each equalization level₀And outputting the information bit stream.

After selecting m₀Then, take the t-th level as an example to illustrate the specific frequency domain equalization and SIC elimination process, where t is 1, 2₀。

The MIMO FDE module 605 is configured to perform frequency domain equalization on the vector after the frequency domain equalization and the SIC input by the t-1 th layer, and output the soft estimation value after the frequency domain equalization to the second data reassembly module 606.

In the bookIn the embodiment, the vector after the frequency domain equalization and SIC input at the t-1 th level is assumed to be X_t[m]And assuming that all SIC of the first t-1 levels have no errors, then there are,

<math><mrow><mover><msub><mi>X</mi><mi>t</mi></msub><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><munder><mi>&Sigma;</mi><mi>k</mi></munder><msub><mover><mi>H</mi><mover><mo>&OverBar;</mo><mo>^</mo></mover></mover><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><msub><mi>D</mi><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>+</mo><mover><mi>N</mi><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>,</mo></mrow></math>

wherein, the <math><mrow><mi>k</mi><mo>&Element;</mo><mo>{</mo><mo>{</mo><mn>1,2</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mi>K</mi><mo>}</mo><mo>-</mo><munderover><mi>&Sigma;</mi><mrow><mi>s</mi><mo>=</mo><mn>1</mn></mrow><mrow><mi>t</mi><mo>-</mo><mn>1</mn></mrow></munderover><msub><mover><mi>k</mi><mo>^</mo></mover><mi>s</mi></msub><mo>}</mo><mo>,</mo></mrow></math> The above-mentioned <math><mrow><msub><mover><mi>k</mi><mo>^</mo></mover><mi>s</mi></msub><mo>=</mo><mrow><mo>(</mo><mo>{</mo><msub><mi>k</mi><mrow><mrow><mo>(</mo><mi>s</mi><mo>-</mo><mn>1</mn><mo>)</mo></mrow><msub><mi>m</mi><mn>0</mn></msub><mo>+</mo><mn>1</mn></mrow></msub><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><msub><mi>k</mi><msub><mi>sm</mi><mn>0</mn></msub></msub><mo>}</mo><mo>&Subset;</mo><mo>{</mo><mn>1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mi>K</mi><mo>}</mo><mo>)</mo></mrow><mo>.</mo></mrow></math>

Obtain X_t[m]Then, the following formula can be adopted for X_t[m]And performing frequency domain equalization operation to obtain a vector after the frequency domain equalization as follows:

wherein, the W [ m ]]A frequency domain equalization weight matrix for the mth subcarrier, and W [ m [ ]]＝R^-1[m]F[m]。

It should be noted that, in this embodiment, for the 1 st frequency domain equalization and SIC layer, the vector input into the MIMO FDE module 605 is the final received signal vector X output by the first data reassembly module 604₁[m]。

A second data re-assembling module 606, configured to re-arrange and combine the frequency-domain equalized vectors input by the MIMO FDE module 605, and output the re-arranged and combined vectors to the IDFT module 607.

In this embodiment, for D_t[m]Rearranged and combined to obtain 2m₀Frequency domain sub-streams, which are respectively:

$D_l^o=\left[D_l^o\right[0],D_l^o[1],...,D_l^o[M-1\left]\right],$

$D_l^e=\left[D_l^e\right[0],D_l^e[1],...,D_l^e[M-1\left]\right],$

wherein, the $l=(k_{(t-1)m_0+1},...,k_{{\mathrm{tm}}_0}).$

The IDFT module 607 is configured to perform IDFT on each sub-data stream input by the second data reassembly module 606, and output all the IDFT-processed time domain sub-data streams to the third data reassembly module 608.

In this embodiment, for D_l ^oAnd D_l ^eThe time domain sub-data streams obtained after the IDFT are respectively the following:

<math><mrow><msubsup><mover><mi>d</mi><mo>~</mo></mover><mi>l</mi><mi>o</mi></msubsup><mo>[</mo><mi>i</mi><mo>]</mo><mo>=</mo><mfrac><mn>1</mn><mi>M</mi></mfrac><munderover><mi>&Sigma;</mi><mrow><mi>n</mi><mo>=</mo><mn>0</mn></mrow><mrow><mi>M</mi><mo>-</mo><mn>1</mn></mrow></munderover><msubsup><mi>D</mi><mi>l</mi><mi>o</mi></msubsup><mo>[</mo><mi>n</mi><mo>]</mo><mi>ej&pi;mi</mi><mo>/</mo><mi>M</mi><mo>,</mo></mrow></math>

<math><mrow><msubsup><mover><mi>d</mi><mo>~</mo></mover><mi>l</mi><mi>e</mi></msubsup><mo>[</mo><mi>i</mi><mo>]</mo><mo>=</mo><mfrac><mn>1</mn><mi>M</mi></mfrac><munderover><mi>&Sigma;</mi><mrow><mi>n</mi><mo>=</mo><mn>0</mn></mrow><mrow><mi>M</mi><mo>-</mo><mn>1</mn></mrow></munderover><msubsup><mi>D</mi><mi>l</mi><mi>e</mi></msubsup><mo>[</mo><mi>n</mi><mo>]</mo><mi>ej&pi;mi</mi><mo>/</mo><mi>M</mi><mo>.</mo></mrow></math>

a third data re-arranging module 608, configured to re-arrange and combine the time-domain sub-data streams input by the IDFT module 607, and output the re-arranged and combined time-domain data streams to the constellation demodulating module 609.

In this embodiment, the obtained two time domain sub-data streams are rearranged and combined, that is, the original sub-data streams after being divided into odd and even data streams are subjected to opposite combination operation, so as to obtain a complete time domain data stream.

The constellation demodulation module 609 is configured to demodulate the data stream input by the third data reassembly module 608 in the planet carrier, and output the data stream after constellation demodulation to the channel decoding module 610.

A channel decoding module 610, configured to perform channel decoding on the data stream input by the constellation demodulation module 609 to obtain m₀A bit stream of information, and m obtained in two time periods which are adjacent to each other₀The individual information bit streams are output to re-encoding modules 611, respectively.

Since m is obtained in each time segment₀An information bit stream, and therefore, in the present embodiment, the information bit stream input to the re-encoding module 611 has a total of 2m₀And (4) respectively.

A re-encoding module 611 for re-encoding the 2m input from the channel decoding module 610₀The information bit stream is re-encoded and the re-encoded frequency domain code sequence is output to the channel gain module 612.

In this embodiment, the frequency domain coding sequence obtained after the re-encoding module 611 is

And since the subsequent assumption is error-free SIC, therefore, ${\hat{D}}_k\left[m\right]=D_k\left[m\right],$ wherein, the <math><mrow><mi>k</mi><mo>&Element;</mo><msub><mover><mi>k</mi><mo>^</mo></mover><mi>s</mi></msub><mo>.</mo></mrow></math>

It should be noted that the re-encoding module in this embodiment actually corresponds to the sending unit part, but only a frequency domain encoding sequence needs to be obtained in this module, and a transmitting part is not needed, and fig. 7 shows a schematic structural diagram of the re-encoding module adopted in this embodiment. As shown in fig. 7, the module includes:

the channel coding module 701 is configured to perform channel coding on an input information bit stream, and output a coded bit stream obtained after the channel coding to the constellation modulation module 702.

The constellation modulation module 702 is configured to modulate the coded bit stream after channel coding input by the channel coding module 701 with a planet carrier, and output a time domain data stream obtained after constellation modulation to the data splitting module 703.

The data splitting module 703 is configured to split the time domain data stream input by the constellation modulation module 702, and output two time domain sub-data streams with the same data volume obtained after splitting to the STBC 704.

The STBC 704 is configured to perform a first predetermined algorithm on the two time domain sub-data streams with the same data amount input by the data splitting module 703, and output two time domain coding sequences obtained after the first predetermined algorithm is performed to the DFT module 705.

It should be noted that, in this embodiment, in two adjacent transmission time periods T1 and T2, different processing manners are respectively adopted for two time domain sub-data streams with the same data volume after splitting, that is, in a time period T1, the time domain sub-data streams after splitting are not processed in the same time domain sub-data stream with the same data volumeSTBC is carried out on the sub-data stream, and two time domain sub-data streams d with the same data volume obtained after splitting are directly processed_k1And d_k2Output to DFT module 305; in a time period T2, the time domain sub-data streams with the same data volume after being split are processed by the first predetermined algorithm, and then output to the DFT module 305.

How to perform the processing procedure of the first predetermined algorithm is the same as that of the sending unit, and details are not described here.

The DFT module 705 is configured to perform DFT on two time domain coding sequences input by the STBC 704 and two time domain data streams input by the data splitting unit 703, respectively, to obtain frequency domain coding sequences, and output the frequency domain coding sequences to the fourth data reassembly module 706.

And a fourth data recombining module 706, configured to rearrange and combine the frequency domain coding sequences input by the DFT module 705 to obtain rearranged and combined frequency domain coding sequences.

In this embodiment, the specific rearrangement and combination manner is as follows:

${\hat{D}}_k\left[m\right]={\left[\begin{array}{cc}{\hat{D}}_k^1\left[m\right]& {\hat{D}}_k^2\left[m\right]\end{array}\right]}^T,$ wherein,

and

output for DFT module 7052m₀Frequency domain sequences respectively corresponding to the transmission sequences D_k ¹[m]And D_k ²[m]And is and <math><mrow><mi>k</mi><mo>&Element;</mo><msub><mover><mi>k</mi><mo>^</mo></mover><mi>s</mi></msub><mo>.</mo></mrow></math>

thus, the recoding module adopted by the embodiment is obtained.

It should be noted that, the specific operations of the channel coding module 701, the constellation modulation module 702, the data splitting module 703, the STBC device 704, and the DFT module 705 adopted in this embodiment are respectively the same as the channel coding module 301, the constellation modulation module 302, the data splitting module 303, the STBC device 304, and the DFT module 305, but the difference is that, in this embodiment, a total of 2m is used₀The processing procedures of the information bit streams, which are K information bit streams in fig. 3, are also completely the same, and therefore, the description thereof is omitted here.

A channel gain module 612, configured to perform channel estimation on the frequency domain coding sequence input by the re-encoding module 611, and output the frequency domain coding sequence obtained after channel estimation to the SIC module 613.

In this embodiment, the channel estimation is performed on the frequency domain coded sequence by actually estimating the channel

And frequency domain coding sequenceMultiplying, and multiplying

Input into SIC module 613, the

Is D_k[m]An estimate of (d).

A SIC module 613, configured to receive output data from the SIC module 613 of the previous layer and data input from the channel gain module 612, perform SIC on the data, and output the data to the MIMO FDE module 605 of the next layer.

In this embodiment, the following calculation method is used to perform SIC on the data to obtain data X after SIC of the current level_t+1[m]I.e. by

<math><mrow><msub><mover><mi>X</mi><mo>&OverBar;</mo></mover><mrow><mi>t</mi><mo>+</mo><mn>1</mn></mrow></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><msub><mover><mi>X</mi><mo>&OverBar;</mo></mover><mi>t</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>-</mo><munder><mi>&Sigma;</mi><mrow><mi>k</mi><mo>&Element;</mo><msub><mover><mi>k</mi><mo>^</mo></mover><mi>s</mi></msub></mrow></munder><msub><mover><mi>H</mi><mover><mo>&OverBar;</mo><mo>^</mo></mover></mover><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><msub><mover><mi>D</mi><mo>^</mo></mover><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>.</mo></mrow></math>

Thus, frequency domain equalization and SIC data on the t-th level are obtained, and the obtained X_t+1[m]And continuing the frequency domain equalization and SIC of the next level until all the frequency domain coding sequences are decoded completely, namely K output information bit streams are obtained.

It should be noted that, in this embodiment, for the first level of frequency domain equalization and SIC, the SIC module 613 receives the input of the first data reassembly module 604 and the input of the channel gain module 612.

Thus, the receiving unit adopted in this embodiment is obtained, and a receiving flow corresponding to the receiving unit is shown in fig. 8, as shown in fig. 8, the receiving flow includes:

step 801: the FFT operation is performed on the signal received by the receiving module.

Step 802: and performing resource inverse mapping on the signal obtained after the FFT.

For comparison with the prior art, in this step, it is assumed that the frequency domain data obtained after inverse mapping of the resource on the p-th receiving module in the time period T1 is X_1，p＝[X_1，p[0]，X_1，p[1]，...，X_1，p[M-1]]^TThe frequency domain data obtained after inverse mapping of the resources on the p-th receiving module in the time period of T2 is X_2，p＝[X_2，p[0]，X_2，p[1]，...，X_2，p[M-1]]^T。

Step 803: and rearranging and combining the frequency domain data obtained after the resource inverse mapping.

In this step, N in the time period T1 obtained by inverse mapping the resource is required_rFrequency domain data and N in T2 time period_rRecombining the frequency domain data to obtain 2M data with the size of N_rX 1 received signal vector

And

and rearrange the received signal vectors on the same sub-carrier in the two time periods as follows:

<math><mrow><msub><mi>X</mi><mrow><mn>1</mn><mo>,</mo></mrow></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><munderover><mi>&Sigma;</mi><mrow><mi>k</mi><mo>=</mo><mn>1</mn></mrow><mi>K</mi></munderover><mi></mi><mrow><mo>(</mo><msubsup><mi>H</mi><mrow><mn>1</mn><mo>,</mo><mi>k</mi></mrow><mn>1</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><msubsup><mi>D</mi><mi>k</mi><mn>1</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><mo>+</mo><msubsup><mi>H</mi><mrow><mn>1</mn><mo>,</mo><mi>k</mi></mrow><mn>2</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><msubsup><mi>D</mi><mi>k</mi><mn>2</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><mo>)</mo></mrow><mo>+</mo><msub><mi>N</mi><mn>1</mn></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>,</mo></mrow></math>

<math><mrow><msub><mi>X</mi><mrow><mn>2</mn><mo>,</mo></mrow></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><munderover><mi>&Sigma;</mi><mrow><mi>k</mi><mo>=</mo><mn>1</mn></mrow><mi>K</mi></munderover><mi></mi><mrow><mo>(</mo><msubsup><mi>H</mi><mrow><mn>2</mn><mo>,</mo><mi>k</mi></mrow><mn>2</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><msubsup><mi>D</mi><mi>k</mi><msup><mn>1</mn><mo>*</mo></msup></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><mo>-</mo><msubsup><mi>H</mi><mrow><mn>2</mn><mo>,</mo><mi>k</mi></mrow><mn>1</mn></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><msubsup><mi>D</mi><mi>k</mi><msup><mn>2</mn><mo>*</mo></msup></msubsup><mo>[</mo><mi>m</mi><mo>]</mo><mo>)</mo></mrow><mo>+</mo><msub><mi>N</mi><mn>2</mn></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>,</mo></mrow></math>

further, the received signal vectors on the same subcarrier in two time periods can be simplified as follows:

<math><mrow><mover><msub><mi>X</mi><mn>1</mn></msub><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><munderover><mi>&Sigma;</mi><mrow><mi>k</mi><mo>=</mo><mn>1</mn></mrow><mi>K</mi></munderover><msub><mover><mi>H</mi><mo>&OverBar;</mo></mover><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><msub><mi>D</mi><mi>k</mi></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>+</mo><mover><mi>N</mi><mo>&OverBar;</mo></mover><mo>[</mo><mi>m</mi><mo>]</mo><mo>.</mo></mrow></math>

step 804: and carrying out frequency domain equalization on the rearranged and combined frequency domain data.

Frequency domain data D obtained after frequency domain equalization is carried out on the frequency domain data₁[m]Comprises the following steps:

wherein, the W [ m ]]A frequency domain equalization weight matrix for the mth subcarrier, and W [ m [ ]]＝R^-1[m]F[m]M is said₀Is an integer divisible by K, and m₀The specific selection process has been described above, and is not described herein again.

Step 805: and rearranging and combining vectors obtained after frequency domain equalization.

In this step, D is obtained₁[m]Are rearranged and combined according to odd and even respectively to obtain D₁ ^o[m]And D₁ ^e[m]Two frequency-domain sub-streams, wherein,

step 806: and performing IDFT on the sub-data stream obtained after rearrangement and combination.

To D₁ ^o[m]And D₁ ^e[m]Respectively carrying out IDFT on the two frequency domain sub-data streams to obtain two time domain sub-data streamsAnd

wherein

<math><mrow><msubsup><mover><mi>d</mi><mo>~</mo></mover><mn>1</mn><mi>o</mi></msubsup><mo>[</mo><mi>i</mi><mo>]</mo><mo>=</mo><mfrac><mn>1</mn><mi>M</mi></mfrac><munderover><mi>&Sigma;</mi><mrow><mi>m</mi><mo>=</mo><mn>0</mn></mrow><mrow><mi>M</mi><mo>-</mo><mn>1</mn></mrow></munderover><msubsup><mi>D</mi><mn>1</mn><mi>o</mi></msubsup><mo>[</mo><mi>n</mi><mo>]</mo><mi>ej&pi;mi</mi><mo>/</mo><mi>M</mi><mo>,</mo></mrow></math>

<math><mrow><msubsup><mover><mi>d</mi><mo>~</mo></mover><mn>1</mn><mi>e</mi></msubsup><mo>[</mo><mi>i</mi><mo>]</mo><mo>=</mo><mfrac><mn>1</mn><mi>M</mi></mfrac><munderover><mi>&Sigma;</mi><mrow><mi>m</mi><mo>=</mo><mn>0</mn></mrow><mrow><mi>M</mi><mo>-</mo><mn>1</mn></mrow></munderover><msubsup><mi>D</mi><mn>1</mn><mi>e</mi></msubsup><mo>[</mo><mi>n</mi><mo>]</mo><mi>ej&pi;mi</mi><mo>/</mo><mi>M</mi><mo>.</mo></mrow></math>

step 807: and rearranging and combining the time domain sub-data streams obtained after the IDFT.

And rearranging and combining the two obtained time domain sub-data streams again, namely performing reverse combination operation on the original sub-data streams which are divided into odd and even data to obtain a complete time domain data stream.

Step 808: and demodulating the obtained time domain data stream in the planet seat.

Step 809: and carrying out channel decoding on the data stream obtained after constellation demodulation to obtain an output information bit stream.

In this step, 2m was obtained₀A bit stream of information, in particular m₀The meaning and the selection process of (A) have already been described, but not hereAnd will be described in detail.

Step 810: judging whether the total number of the obtained information bit streams is K or not, and if so, ending; otherwise, step 811 is performed.

Judging the total number of the obtained information bit streams, and if the total number of the information bit streams is K, ending the receiving process; otherwise, step 811 is performed.

Step 811: the information bit stream resulting from step 810 is re-encoded.

2m is₀Recoding an information bit stream as described in fig. 7, resulting in 2m₀A frequency domain code sequence D₁[m]。

Step 812: and performing SIC on the recoded information bit stream.

SIC of the following formula is carried out on the rearranged and combined frequency domain data to obtain SIC data X₂[m]Comprises the following steps:

<math><mrow><msub><mover><mi>X</mi><mo>&OverBar;</mo></mover><mn>2</mn></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>=</mo><msub><mover><mi>X</mi><mo>&OverBar;</mo></mover><mn>1</mn></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>-</mo><msub><mover><mi>H</mi><mover><mo>&OverBar;</mo><mo>^</mo></mover></mover><mn>1</mn></msub><mo>[</mo><mi>m</mi><mo>]</mo><msub><mi>D</mi><mn>1</mn></msub><mo>[</mo><mi>m</mi><mo>]</mo><mo>.</mo></mrow></math>

step 813: and after frequency domain equalization is performed on the data obtained after the SIC, returning to the step 805.

Again introduce X₂[m]The frequency domain equalization process as described in step 804 is performed to obtain the data D after frequency domain equalization₂[m]And returns to perform step 805.

At this point, the whole work flow of the receiving unit adopted in the present embodiment is completed.

In summary, in the embodiment, the re-encoding module in the receiving unit is actually a part of the transmitting unit, and therefore, the transmitting unit and the receiving unit should be used in correspondence with each other.

Example two

In this embodiment, STBC is performed after DFT, which is shown in the schematic structural diagram of the link transmitting unit shown in fig. 9. As shown in fig. 9, the transmission unit includes:

a channel coding module 901, configured to perform channel coding on an input information bit stream, and output a coded bit stream obtained after the channel coding to a constellation modulation module 902.

A constellation modulation module 902, configured to modulate the coded bit stream after channel coding input by the channel coding module 901 in a planet carrier, and output a time domain data stream obtained after constellation modulation to the data splitting module 903.

In order to compare the specific coding results of STBC before DFT with those after DFT, in this embodiment, it is assumed that the time domain data stream on the k-th antenna is also d_k＝[d_k[0]，d_k[1]，...，d_k[2M-1]]^TAnd k is the serial number of the antenna group, and 2M is the number of data in the time domain data stream.

The data splitting module 903 is configured to split the time domain data stream input by the constellation modulation module 902, and output two time domain sub-data streams with the same data volume obtained after splitting to the DFT module 904 respectively.

Like the embodiment, in the embodiment, the time domain data stream d_kWhen the stream is divided, the data is divided equally into two time domain sub-data streams d with the same data volume_k1And d_k2The specific implementation process is the same as that of the data splitting module 303, and details thereof are not described here.

The DFT module 904 is configured to perform DFT on the two time domain sub-data streams with the same data size input by the data splitting module 903, respectively, to obtain two frequency domain sub-data streams, and output the two frequency domain sub-data streams to the STBC device 905.

In this embodiment, two time domain sub-data streams d with the same data size are processed_k1And d_k2DFT is carried out to obtain two frequency domain sub-data streams D_k1And D_k2The data amounts of (a) and (b) are the same, respectively:

D_k1＝[D_k1[0]，D_k1[1]，...，D_k1[M-1]]^T，

D_k2＝[D_k2[0]，D_k2[1]，...，D_k2[M-1]]^T，

wherein, D is_k1[0]，D_k1[1]，...，D_k1[M-1]Is d_k1[0]，d_k1[1]，...，d_k1[M-1]DFT result of (1), said D_k2[0]，D_k2[1]，...，D_k2[M-1]Is d_k2[0]，d_k2[1]，...，d_k2[M-1]The result of DFT (step (d)).

It should be noted that, in this embodiment, in two adjacent different time periods T1 and T2, different processing manners are also respectively adopted after DFT is performed on the two time domain sub-data streams after splitting, and the processing manners of the two time periods may be interchanged, which practically does not affect the implementation of the embodiment of the present invention. The specific processing procedure is exemplified below.

Directly dividing the two frequency domain sub-data streams D after DFT in the T1 time period_k1And D_k2Output to resource mapping module 906;

within the time period T2, dividing the two frequency domain sub-data streams D after DFT_k1And D_k2Output to the STBC 905.

The STBC 905 is configured to perform processing of a second predetermined algorithm on the two frequency domain sub-data streams input by the DFT module 904 to obtain a frequency domain coding sequence, and output the frequency domain coding sequence to the resource mapping module 906.

For two frequency domain sub-data streams D_k1And D_k2And processing by a second preset algorithm to obtain two frequency domain coding sequences, wherein different frequency domain coding sequences can be obtained by different processing processes. In the present embodiment, two frequency domain sub-streams D are processed_k1And D_k2STBC is carried out to obtain a frequency domain coding sequence D_k ¹And D_k ²Respectively as follows:

${\mathrm{<figure-callout\; id="1"\; label="D\; k"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">D</figure-callout>}}_k^{}={[-{\left[D_{k2}\right[0\left]\right]}^{*},{-\left[D_{k2}\right[1\left]\right]}^{*},...,{-\left[D_{k2}\right[M-2\left]\right]}^{*},{-\left[D_{k2}\right[M-1\left]\right]}^{*}]}^T,$

$D_k^2={[{\left[D_{k1}\right[0\left]\right]}^{*},{\left[D_{k1}\right[1\left]\right]}^{*},...,{\left[D_{k1}\right[M-2\left]\right]}^{*},{\left[D_{k1}\right[M-1\left]\right]}^{*}]}^T.$

the specific processing procedure adopted in this embodiment is as follows:

$D_k^1\left(s\right)={-\left[D_{k2}\left(s\right)\right]}^{*},$ $D_k^2\left(s\right)={\left[D_{k1}\left(s\right)\right]}^{*},$ wherein s is 0, 1^*Is conjugation of said D_k1(s) is a frequency domain sub-stream D_k1The s element of (a), the D_k2(s) is a frequency domain sub-stream D_k2The s element of (a), the D_k ¹(s) is a frequency domain coding sequence D_k ¹The s-th element of (1).

It should be noted that other STBC processes may be adopted in practice, so as not to affect the implementation of the embodiment of the present invention.

It should be noted that, the above is only described by taking the case where STBC is not performed in the T1 time period and STBC is performed in the T2 time period as an example, STBC may also be performed in the T1 time period and STBC is not performed in the T2 time period to implement the complete STBC process of the embodiment, which practically does not affect the implementation of the embodiment of the present invention.

In the present embodiment, from D_k1、D_k2、D_k ¹And D_k ²As can be seen from the expression of (A), D_k1、D_k2、D_k ¹And D_k ²In transmit diversity order, indicating that STBC for the SC-FDMA system is complete. And the specific determination method of the transmit diversity order arrangement is the same as the prior art, and is not described herein again.

Likewise, in this embodiment, because the STBC encoding process is different, the two obtained frequency domain coded sequences will have different expressions, regardless of their expressions, as long as the two frequency domain coded sequences are arranged in the order of transmit diversity, which indicates that STBC is completed.

A resource mapping module 906, configured to perform resource mapping on the frequency domain data stream input by the DFT module 904 and the frequency domain coding sequence input by the STBC 905, and output the frequency domain coding sequence after resource mapping to the IFFT module 907.

An IFFT module 907, configured to perform IFFT on the frequency domain coding sequence after resource mapping input by the resource mapping module 906, and output the frequency domain coding sequence after IFFT to the transmitting module 908.

A transmitting module 908, configured to transmit the frequency domain coding sequence after IFFT input by the IFFT module 907.

Thus, the link sending unit adopted in the embodiment is obtained.

It should be noted that, in this embodiment, the specific operations of the channel coding module 901, the constellation modulation module 902, the resource mapping module 906, the IFFT module 907, and the transmitting module 908 are respectively the same as those of the existing channel coding module 101, the constellation modulation module 102, the resource mapping module 105, the IFFT module 106, and the transmitting module 107, and the specific operation of the data splitting module 903 is the same as that of the data splitting module 303 in the first embodiment, which is not described herein again. Meanwhile, the number of the channel coding modules 901, the constellation modulation modules 902, the data splitting modules 903 and the STBC devices 905 is the same as that of the plurality of the channel coding modules 901, the number of the DFT modules 904, the number of the resource mapping modules 906 and the number of the IFFT modules 907 are four times that of the channel coding modules 901, and the number of the transmitting modules 908 is twice that of the channel coding modules 901.

Similarly, in this embodiment, the processing of the information bit stream k by the k-th antenna group is also described as an example. In practice, if there are multiple information bit streams, the multiple information bit streams are processed in parallel, each information bit stream is transmitted on a respective antenna group, and the information bit streams on other antenna groups are not affected during transmission, and are not affected by the information bit streams on other antennas.

Fig. 10 is a transmission flowchart corresponding to the transmitting unit shown in fig. 9, and as shown in fig. 10, the transmission flowchart includes:

step 1001: a stream of information bits to be processed is input.

Step 1002: and carrying out channel coding on the input information bit stream to obtain a coded bit stream subjected to channel coding.

Step 1003: and modulating the coded bit stream obtained after channel coding by a planet seat to obtain a time domain data stream modulated by a constellation.

In order to compare the specific coding results of STBC before DFT with those after DFT, in this embodiment, it is assumed that the time domain data stream on the k-th antenna is also d_k＝[d_k[0]，d_k[1]，...，d_k[2M-1]]^TAnd k is the serial number of the antenna group, and 2M is the number of data in the time domain data stream.

Step 1004: and splitting the time domain data stream modulated by the constellation to obtain two time domain sub-data streams with the same data volume after splitting.

Like the embodiment, in the embodiment, the time domain data stream d_kWhen the stream is divided, the data is divided equally into two time domain sub-data streams d with the same data volume_k1And d_k2The specific implementation process is the same as that of the data splitting module 303, and details thereof are not described here.

Step 1005: and respectively carrying out DFT on the two time domain sub-data streams with the same data volume after the splitting to obtain two frequency domain sub-data streams.

In this embodiment, two time domain sub-data streams d with the same data size are processed_k1And d_k2DFT is carried out to obtain two frequency domain sub-data streams D_k1And D_k2The data amounts of (a) and (b) are the same, respectively:

D_k1＝[D_k1[0]，D_k1[1]，...，D_k1[M-1]]^T，

D_k2＝[D_k2[0]，D_k2[1]，...，D_k2[M-1]]^T，

wherein, D is_k1[0]，D_k1[1]，...，D_k1[M-1]Is d_k1[0]，d_k1[1]，...，d_k1[M-1]DFT result of (1), said D_k2[0]，D_k2[1]，...，D_k2[M-1]Is d_k2[0]，d_k2[1]，...，d_k2[M-1]The result of DFT (step (d)).

Similarly, in this embodiment, different processing procedures are applied to the frequency-domain sub-data stream after DFT in different time periods, and the specific processing procedures of the two time periods may be interchanged, which does not affect the implementation of the embodiment of the present invention. The following explains the specific processing procedure by taking as an example the operations of step 1006 to step 1008 performed in the time period T1 and the operations of step 1009 to step 1012 performed in the time period T2.

The specific processing procedure of the time period T1 is as follows:

step 1006: and performing resource mapping on the two frequency domain sub-data streams to obtain the frequency domain sub-data stream after resource mapping.

Step 1007: and performing IFFT on the frequency domain sub-data stream subjected to resource mapping to obtain the frequency domain sub-data stream subjected to IFFT.

Step 1008: and transmitting the frequency domain sub-data stream after IFFT.

At this point, the specific processing procedure in the time period T1 is completed.

The specific treatment process in the time period T2 is as follows:

step 1009: and carrying out second preset STBC (space time block coding) processing on the frequency domain sub-data stream obtained after DFT (discrete Fourier transform) to obtain a frequency domain coding sequence.

For two frequency domain sub-data streams D_k1And D_k2And performing second preset STBC treatment to obtain two frequency domain coding sequences, wherein different frequency domain coding sequences can be obtained by different preset STBC treatment processes. In the present embodiment, two frequency domain sub-streams D are processed_k1And D_k2STBC is carried out to obtain a frequency domain coding sequence D_k ¹And D_k ²Respectively as follows:

${\mathrm{<figure-callout\; id="1"\; label="D\; k"\; filenames="H2009102426243E00021.png"\; state="\{\{state\}\}">D</figure-callout>}}_k^{}={[-{\left[D_{k2}\right[0\left]\right]}^{*},{-\left[D_{k2}\right[1\left]\right]}^{*},...,{-\left[D_{k2}\right[M-2\left]\right]}^{*},{-\left[D_{k2}\right[M-1\left]\right]}^{*}]}^T,$

$D_k^2={[{\left[D_{k1}\right[0\left]\right]}^{*},{\left[D_{k1}\right[1\left]\right]}^{*},...,{\left[D_{k1}\right[M-2\left]\right]}^{*},{\left[D_{k1}\right[M-1\left]\right]}^{*}]}^T.$

the specific STBC procedure adopted in this embodiment is as follows:

$D_k^1\left(s\right)={-\left[D_{k2}\left(s\right)\right]}^{*},$ $D_k^2\left(s\right)={\left[D_{k1}\left(s\right)\right]}^{*},$ wherein s is 0, 1, M-1, and D_k1(s) is a frequency domain sub-stream D_k1The s element of (a), the D_k2(s) is a frequency domain sub-stream D_k2The s element of (a), the D_k ¹(s) is a frequency domain coding sequence D_k ¹The s-th element of (1).

It should be noted that other STBC processes may be adopted in practice, so as not to affect the implementation of the embodiment of the present invention.

Step 1010: and carrying out resource mapping on the frequency domain coding sequence to obtain the frequency domain coding sequence after resource mapping.

Step 1011: and performing IFFT on the frequency domain coding sequence after the resource mapping to obtain the frequency domain coding sequence after IFFT.

Step 1012: and transmitting the frequency domain coding sequence after the IFFT.

At this point, the specific processing procedure in the time period T2 is completed.

After the specific operations in the time periods T1 and T2 are completed, the whole workflow of the link sending unit adopted in the second embodiment of the present invention is completed.

It should be noted that the specific processing procedures of step 1001 to step 1004 are the same as those of step 501 to step 504, and therefore, the detailed description thereof is omitted here.

It should be noted that, the description of the method described in this embodiment is also explained by taking the processing of one information bit stream as an example, as in the description of the method described in the first embodiment, and in practice, a plurality of information bit streams may be processed simultaneously.

The receiving unit corresponding to the sending unit in this embodiment is similar to the link receiving unit described in fig. 6, and is different from the link receiving unit described in fig. 6 in that, referring to fig. 11, a specific structure of a re-encoding module used in the link receiving unit in this embodiment is as shown in fig. 11, and the re-encoding module includes:

the channel coding module 1101 is configured to perform channel coding on an input information bit stream, and output a coded bit stream after the channel coding to the constellation modulation module 1102.

The constellation modulation module 1102 is configured to modulate the coded bit stream after channel coding input by the channel coding module 1101 in a planet carrier, and output a time domain data stream obtained after constellation modulation to the data splitting module 1103.

The data splitting module 1103 is configured to split the time domain data stream input by the constellation modulation module 1102, and output two time domain sub-data streams with the same data size obtained after splitting to the DFT module 1104.

A DFT module 1104, configured to perform DFT on the two time domain sub-data streams with the same data size input by the data splitting module 1103 respectively to obtain two frequency domain sub-data streams, and output the two frequency domain sub-data streams to the STBC device 1105.

It should be noted that, in this embodiment, after performing DFT on the two split time domain sub-data streams in two adjacent different time periods T1 and T2, different processing manners are also respectively adopted, and in a time period T1, the two frequency domain sub-data streams after DFT are directly output to the fourth data reassembly module 1106; during the time period T2, the two frequency domain sub-streams after DFT are output to the STBC 1105.

The STBC unit 1105 is configured to perform processing of a second predetermined algorithm on the two frequency domain sub-data streams input by the DFT module 1104 to obtain a frequency domain coding sequence, and output the frequency domain coding sequence to the fourth data reassembly module 1106.

A fourth data reassembly module 1106, configured to rearrange and combine the frequency domain sub-data stream input by the DFT module 1104 and the frequency domain coding sequence input by the STBC device 1105, to obtain a rearranged and combined frequency domain coding sequence.

In this embodiment, the specific rearrangement and combination manner is as follows:

${\hat{D}}_k\left[m\right]={\left[\begin{array}{cc}{\hat{D}}_k^1\left[m\right]& {\hat{D}}_k^2\left[m\right]\end{array}\right]}^T,$ wherein,

and2m for output of STBC 1105₀Frequency domain sequences respectively corresponding to the transmission sequences D_k ¹[m]And D_k ²[m]And is and <math><mrow><mi>k</mi><mo>&Element;</mo><msub><mover><mi>k</mi><mo>^</mo></mover><mi>s</mi></msub><mo>.</mo></mrow></math>

thus, the recoding module adopted by the embodiment is obtained.

It should be noted that, the specific operations of the channel coding module 1101, the constellation modulation module 1102, the data splitting module 103, the STBC device 1104 and the DFT module 1105 adopted in this embodiment are respectively the channel coding module 901, the constellation modulation module 902, the data splitting module 903, the STBC device 904 and the DFT module 905, but the difference is that in this embodiment, a total of 2m is used₀The processing procedures of the information bit streams, which are K information bit streams in fig. 9, are also completely the same, and therefore, the description thereof is omitted here.

It should be noted that the re-encoding module employed in the receiving unit of this embodiment actually corresponds to the transmitting unit of this embodiment.

In summary, the link transmission apparatus and method in the SC-FDMA system according to the present invention adds a data splitting module to a link sending unit, so that a time domain sub-data stream obtained after splitting can be converted into a frequency domain sub-data stream first and then STBC is performed on the frequency domain sub-data stream, or STBC is directly performed on the time domain sub-data stream, and thus STBC can be performed not only in the frequency domain but also in the time domain, and further STBC can be performed both after DFT and before DFT, thereby improving flexibility of system design.

Furthermore, when the multi-antenna transmit diversity is carried out, the invention not only considers the condition of one antenna group in the transmitting unit, but also carries out the planning of the multi-antenna group, so that a plurality of information bit streams can be simultaneously transmitted, and the SIC problem caused by the diversity of a plurality of transmit antennas is considered in the receiving unit.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (24)

1. A link sending unit in a single carrier frequency division multiple access SC-FDMA system comprises a channel coding module, a constellation modulation module, a Fourier transform DFT module, a space-time block code STBC device, a resource mapping module, an inverse fast Fourier transform IFFT module and a transmitting module, and is characterized by also comprising a data distribution module, wherein,

the data distribution module receives the time domain data stream input by the constellation modulation module for distribution, and outputs two time domain sub-data streams with the same data volume obtained after distribution to the DFT module in the first time period of two adjacent time periods, and the DFT module performs DFT processing on the two input time domain sub-data streams and outputs the two obtained frequency domain sub-data streams with the same data volume to the resource mapping module for resource mapping; in a second time period of the two adjacent time periods, outputting the two time domain sub-data streams with the same data volume to the STBC device, processing the two input time domain sub-data streams by using a first preset algorithm by the STBC device, outputting the two obtained time domain coding sequences with the same data volume and arranged in a transmission diversity sequence to the DFT module, and outputting the two obtained frequency domain coding sequences with the same data volume to the resource mapping module for resource mapping after performing DFT processing on the two input time domain coding sequences by the DFT module;

or, the data splitting module receives the time domain data stream input by the constellation modulation module for splitting, and outputs two time domain sub-data streams with the same data volume obtained after splitting to the DFT module in the first time period of two adjacent time periods, and the DFT module performs DFT processing on the two input time domain sub-data streams and outputs the two obtained frequency domain sub-data streams with the same data volume to the resource mapping module for resource mapping; in the second time slot of the two adjacent time slots, the two time domain sub-data streams with the same data volume obtained after the shunting are output to the DFT module, the DFT module performs DFT processing on the two input time domain sub-data streams, and then respectively outputs the two obtained frequency domain sub-data streams with the same data volume to the STBC device, the STBC device performs processing of a second predetermined algorithm on the two input frequency domain sub-data streams with the same data volume, and obtains two frequency domain coding sequences with the same data volume and arranged in the order of transmit diversity, and the two frequency domain coding sequences are output to the resource mapping module for resource mapping.

2. The transmitting unit according to claim 1, wherein the number of the channel coding modules, the constellation modulation modules, the data splitting modules and the STBC devices is the same as a plurality of the channel coding modules; the number of the DFT module, the resource mapping module and the IFFT module is four times that of the channel coding module; the number of the transmitting modules is twice that of the channel coding modules;

each channel coding module receives one channel of information bit stream and outputs the information bit stream to a corresponding data distribution module;

in the first time period of the two adjacent time periods, each data distribution module respectively outputs the distributed two time domain sub-data streams to the corresponding two DFT modules, and the two DFT modules respectively output the obtained two frequency domain sub-data streams to the corresponding two resource mapping modules; in the second time period of the two adjacent time periods, each data distribution module outputs the two time domain sub-data streams after distribution to a corresponding STBC device, the STBC device respectively outputs the two obtained time domain coding sequences to two corresponding DFT modules, and the two DFT modules respectively output the two obtained frequency domain coding sequences to two corresponding resource mapping modules; or, in the first time period of the two adjacent time periods, each data splitting module outputs the split two time domain sub-data streams to the corresponding two DFT modules respectively, and the two DFT modules output the obtained two frequency domain sub-data streams to the corresponding two resource mapping modules respectively; in the second time period of the two adjacent time periods, each data distribution module respectively outputs the two time domain sub-data streams after distribution to the two corresponding DFT modules, the two DFT modules output the two obtained frequency domain sub-data streams to a corresponding STBC device, and the STBC device respectively outputs the two obtained frequency domain coding sequences to the two corresponding resource mapping modules;

the four resource mapping modules respectively output the four data streams subjected to resource mapping to four corresponding IFFT modules;

the four IFFT modules output the four IFFT-processed data streams to two corresponding transmitting modules in two immediately adjacent different time periods, respectively.

3. The sending unit according to claim 1 or 2, wherein the data splitting module is: the data distribution module can distribute the odd and even data of the time domain data stream to obtain the time domain sub data stream with the same data quantity of the odd sub data stream and the even sub data stream.

4. The transmission unit of claim 2, wherein the STBC processor performing the first predetermined algorithm processing on the two input time-domain sub-streams is: an STBC machine capable of implementing the following algorithm;

$d_k^1=P{\left[{\left[d_{k1}\right]}^H\right]}^T,$

$d_k^2=-P{\left[{\left[d_{k2}\right]}^H\right]}^T,$

wherein, the

The above-mentioned^TTo be transposed, the^HFor conjugate transpose, M is 1/2 of the number of data in the time domain data stream, and k is the sequence number of the sending unit.

5. The transmission unit of claim 4, wherein the STBC device comprises:

a data stream processing module for converting the time domain sub-data stream d_k1And d_k2Carrying out treatment, and treating the treated [ [ d ]_k1]^H]^TAnd [ [ d ]_k2]^H]^TRespectively outputting to the multiplying modules;

a multiplying module for multiplying the data streamsInput of processing module [ [ d ]_k1]^H]^TAnd [ [ d ]_k2]^H]^TRespectively multiplying with the coding matrix P, and taking a result obtained after the multiplication as d_k ¹Outputting another result obtained after multiplication to an negation module;

an negation module for negating the other result input by the multiplication module to obtain d_k ²。

6. The transmission unit of claim 2, wherein the STBC processor performing the second predetermined algorithmic processing on the input two frequency domain sub-streams is: an STBC machine capable of implementing the following algorithm;

$D_k^1\left(s\right)=-{\left[D_{k2}\left(s\right)\right]}^{*},$ $D_k^2\left(s\right)={\left[D_{k1}\left(s\right)\right]}^{*},$ wherein s is 0, 1^*Is conjugation of said D_k1(s) is a frequency domain sub-stream D_k1The s element of (a), the D_k2(s) is a frequency domain sub-stream D_k2The s element of (a), the D_k ¹(s) is a frequency domain coding sequence D_k ¹And k is the sequence number of the sending unit.

7. A space-time block code (STBC) device in a single carrier frequency division multiple access (SC-FDMA) system, the STBC device comprising:

the data stream processing module is used for respectively processing the first data stream and the second data stream into the conjugate of the original data stream and outputting the two processed data streams to the multiplication module;

the multiplication module is used for multiplying the two processed data streams input by the data stream processing module by the coding matrix P respectively, taking one data stream obtained after multiplication as a coding sequence, and outputting the other data stream obtained after multiplication to the negation module;

the negation module is used for negation operation of the other data stream input by the multiplication module to obtain another coding sequence,

wherein, the

The T is the length of each data stream input.

8. A link receiving unit in a SC-FDMA system, which includes a first data reassembly module, characterized in that the unit further includes K/m₀A layered processing module, wherein,

the first layered processing module receives the data which is output by the first data restructuring module and is used for rearranging and combining the frequency domain data after all resources are inversely mapped, and 2m is generated after frequency domain equalization and successive interference SIC elimination processing are carried out₀Outputting the information bit stream, and outputting the 2m₀The information bit stream is sent to the next layered processing module, and the next layered processing module processes the information bit stream and outputs 2m₀An information bit stream, and the 2m₀Sending the information bit stream to the next hierarchical processing module for processing until the K/m₀The last 2m is output after being processed by the layered processing module₀An information bit stream;

wherein, the K/m₀Each hierarchical processing module comprises: multiple-input multiple-output (MIMO) frequency domain equalization FDE module, second data reconstruction module and 2m₀An IDFT module, a third data reorganization module, and m₀Constellation demodulation module m₀A channelCoding modules, 1 st to Kth/m₀-the 1 hierarchical processing module further comprises: the device comprises a recoding module, a channel gain module and a SIC module;

the MIMO FDE module receives frequency domain data input from the outside of the hierarchical processing module where the MIMO FDE module is located, and sends the FDE-processed frequency domain data to the second data reconstruction module;

the second data restructuring module rearranges and combines the frequency domain data to generate 2m₀The frequency domain sub-data streams are respectively input into corresponding inverse Fourier transform (IDFT) modules; the IDFT module processes 2m after IDFT₀The frequency domain sub-data streams are output to a third data recombination module; the third data recombination module rearranges and combines the frequency domain sub-data to generate m₀The frequency domain data streams are respectively input to corresponding constellation demodulation modules; the constellation demodulation module outputs the data stream after constellation demodulation to the channel decoding module; the channel decoding module is used for decoding the channel-decoded 2m₀Outputting an information bit stream; the channel decoding module in the 1 st to Kth/m 0-1 st hierarchical processing modules also decodes the 2m₀Sending the information bit stream to a recoding module;

the recoding module comprises a channel coding module, a constellation modulation module, a data distribution module, a Fourier transform DFT module, a space-time block code coding STBC device and a fourth data recombination module, wherein the constellation modulation module receives m₀After constellation modulation is carried out on the data, a time domain data stream is formed and sent to a data distribution module; the data distribution module receives the time domain data stream input by the constellation modulation module for distribution, and outputs two time domain sub-data streams with the same data volume obtained after distribution to the STBC device; the STBC carries out processing of a first preset algorithm on two input time domain sub-data streams, and two obtained time domain coding sequences which have the same data volume and are sequentially arranged in a transmission diversity mode are output to the DFT module; after the DFT module carries out DFT processing on the two input time domain coding sequences, the two obtained frequency domain coding sequences with the same data quantity are output to the fourth data recombination module for rearrangement and combination;

or, the data splitting module receives the time domain data stream input by the constellation modulation module for splitting, and outputs two time domain sub-data streams with the same data volume obtained after splitting to the DFT module; after the DFT module performs DFT processing on the two input time domain sub-data streams, the two obtained frequency domain sub-data streams with the same data volume are respectively output to the STBC; the STBC device carries out processing of a second preset algorithm on two input frequency domain sub-data streams with the same data volume to obtain two frequency domain coding sequences with the same data volume and arranged in the sequence of the transmission diversity, and the two frequency domain coding sequences are output to the fourth data recombination module for rearrangement and combination;

the fourth data recombination module outputs the rearranged and combined frequency domain coding sequence to the channel gain module; the channel gain module carries out channel estimation on the received rearranged and combined frequency domain coding sequence and outputs the frequency domain coding sequence after the channel estimation to the SIC module;

the SIC module receives frequency domain data input from the outside of the hierarchical processing module, performs SIC processing on the frequency domain data and the frequency domain coding sequence received from the channel gain module, and sends the processed frequency domain data to a MIMO FDE module in the next hierarchical processing module, which is not the K/m th hierarchical processing module₀The frequency domain data is also sent to a SIC module in the next hierarchical processing module by each hierarchical processing module;

k is the total number of output information bit streams, m₀Is an integer divisible by K.

9. The receiving unit of claim 8, wherein the data splitting module is to: the data distribution module can distribute the odd and even data of the time domain data stream to obtain the time domain sub data stream with the same data quantity of the odd sub data stream and the even sub data stream.

10. The receiving unit of claim 8 wherein the STBC processor performing the first predetermined algorithmic processing on the two input time domain sub-streams is: an STBC machine capable of implementing the following algorithm;

$d_k^1=P{\left[{\left[d_{k1}\right]}^H\right]}^T,$

$d_k^2=-P{\left[{\left[d_{k2}\right]}^H\right]}^T,$

wherein, the

The above-mentioned^TTo be transposed, the^HFor conjugate transpose, M is 1/2 of the number of data in the time domain data stream, and k is the sequence number of the sending unit.

11. The receiving unit of claim 10, wherein the STBC machine comprises:

a data stream processing module for converting the time domain sub-data stream d_k1And d_k2Carrying out treatment, and treating the treated [ [ d ]_k1]^H]^TAnd [ [ d ]_k2]^H]^TRespectively outputting to the multiplying modules;

a multiplying module for inputting [ d ] of the data stream processing module_k1]^H]^TAnd [ [ d ]_k2]^H]^TRespectively multiplying with the coding matrix P, and taking a result obtained after the multiplication as d_k ¹Outputting another result obtained after multiplication to an negation module;

an inverting module for inverting the other result input by the multiplying module to obtainTo d_k ²。

12. The receiving unit of claim 8, wherein the STBC processor performing the second predetermined algorithmic processing on the input two frequency domain sub-streams is: an STBC machine capable of implementing the following algorithm;

$D_k^1\left(s\right)=-{\left[D_{k2}\left(s\right)\right]}^{*},$ $D_k^2\left(s\right)={\left[D_{k1}\left(s\right)\right]}^{*},$ wherein s is 0, 1^*Is conjugation of said D_k1(s) is a frequency domain sub-stream D_k1The s element of (a), the D_k2(s) is a frequency domain sub-stream D_k2The s element of (a), the D_k ¹(s) is a frequency domain coding sequence D_k ¹And k is the sequence number of the sending unit.

13. A link transmission apparatus in a single carrier frequency division multiple access SC-FDMA system, comprising the transmitting unit of claim 2 and the receiving unit of claim 8.

14. A link transmission method in a single carrier frequency division multiple access SC-FDMA system, applied to the transmission unit according to claim 1, the method comprising:

receiving and splitting the time domain data stream input by the constellation modulation module by a data splitting module, outputting two time domain sub-data streams with the same data volume obtained after splitting to the DFT module in the first time period of two adjacent time periods, and outputting two frequency domain sub-data streams with the same data volume obtained after DFT processing the two time domain sub-data streams by the DFT module to the resource mapping module for resource mapping; in the second time slot of the two adjacent time slots, the two time domain sub-data streams with the same data volume obtained after the splitting are output to the space-time block code coding STBC device, the STBC device carries out processing of a first preset algorithm on the two input time domain sub-data streams, the two obtained time domain coding sequences with the same data volume and arranged in the transmission diversity sequence are output to the Fourier transform DFT module, and after the DFT module carries out DFT processing on the two input time domain coding sequences, the two obtained frequency domain coding sequences with the same data volume are output to the resource mapping module for resource mapping;

or, the data splitting module receives the time domain data stream input by the constellation modulation module for splitting, and in the first time period of two adjacent time periods, outputs two time domain sub-data streams with the same data volume obtained after splitting to the DFT module, and after performing DFT processing on the two input time domain sub-data streams by the DFT module, outputs the two obtained frequency domain sub-data streams with the same data volume to the resource mapping module for resource mapping; in the second time period of the two adjacent time periods, the two time domain sub-data streams with the same data volume obtained after the shunting are output to the DFT module, the DFT module carries out DFT processing on the two input time domain sub-data streams, the two obtained frequency domain sub-data streams with the same data volume are respectively output to the STBC device, the STBC device carries out processing of a second preset algorithm on the two input frequency domain sub-data streams with the same data volume, the two obtained frequency domain coding sequences with the same data volume and arranged in the order of the transmission diversity are output to the resource mapping module for resource mapping.

15. The transmission method of claim 14, wherein the number of the channel coding modules, the constellation modulation modules, the data splitting modules and the STBC devices is the same as a plurality of the channel coding modules; the number of the DFT module, the resource mapping module and the Inverse Fast Fourier Transform (IFFT) module is four times that of the channel coding module; the number of the transmitting modules is twice that of the channel coding modules;

before the data splitting module receives and splits the time domain data stream input by the constellation modulation module, the method further includes: each channel coding module receives one channel of information bit stream and outputs the information bit stream to a corresponding data distribution module;

in a first time period of the two adjacent time periods, outputting the two time domain sub-data streams with the same data volume obtained after splitting to the DFT module includes: outputting the two time domain sub-data streams after being divided to the two corresponding DFT modules by each data dividing module, and outputting the two obtained frequency domain sub-data streams with the same data volume to the resource mapping module by the DFT module includes: the two DFT modules respectively output the two obtained frequency domain sub-data streams to the two corresponding resource mapping modules; in a second time period of the two adjacent time periods, outputting the two time domain sub-data streams with the same data volume obtained after splitting to the STBC device includes: outputting the two time domain sub-data streams after being split to a corresponding STBC device by each data splitting module, wherein outputting the two obtained time domain coding sequences to the DFT module by the STBC device includes: the STBC device respectively outputs the obtained two time domain coding sequences to the corresponding two DFT modules, and the outputting, by the DFT modules, the obtained two frequency domain coding sequences with the same data size to the resource mapping module includes: the two DFT modules respectively output the two obtained frequency domain data streams to the two corresponding resource mapping modules; or,

in a first time period of the two adjacent time periods, outputting the two time domain sub-data streams with the same data volume obtained after splitting to the DFT module includes: outputting the two time domain sub-data streams after being divided to the two corresponding DFT modules by each data dividing module, and outputting the two obtained frequency domain sub-data streams with the same data volume to the resource mapping module by the DFT module includes: the two DFT modules respectively output the obtained two frequency domain sub-data streams to the corresponding two resource mapping modules; in a second time period of the two adjacent time periods, outputting the two time domain sub-data streams with the same data volume obtained after splitting to the DFT module includes: outputting the two time domain sub-data streams after being divided to the two corresponding DFT modules by each data dividing module, and outputting the two obtained frequency domain sub-data streams with the same data volume to the STBC device by the DFT modules respectively includes: outputting the two obtained frequency domain sub-data streams to a corresponding one of the STBC devices by the two DFT modules, outputting the two obtained frequency domain coding sequences to the resource mapping module by the STBC device includes: the STBC respectively outputs the two obtained frequency domain coding sequences to the two corresponding resource mapping modules;

the performing resource mapping includes: the four resource mapping modules respectively output the four data streams subjected to resource mapping to four corresponding IFFT modules;

after the resource mapping is performed, the method further includes: the four IFFT modules output the four IFFT-processed data streams to two corresponding transmitting modules, respectively.

16. The transmission method of claim 14 or 15, wherein the splitting, by a data splitting module, the time-domain data stream comprises:

and carrying out odd-even distribution on the time domain data stream by a data distribution module to obtain two time domain sub-data streams with the same data quantity, namely an odd sub-data stream and an even sub-data stream.

17. The transmission method of claim 15, wherein the processing by the STBC processor of the input two time-domain sub-data streams by the first predetermined algorithm comprises:

$d_k^1=P{\left[{\left[d_{k1}\right]}^H\right]}^T,$

$d_k^2=-P{\left[{\left[d_{k2}\right]}^H\right]}^T,$

wherein, the

The above-mentioned^TTo be transposed, the^HFor conjugate transpose, M is 1/2 of the number of data in the time domain data stream, and k is the sequence number of the sending unit.

18. The transmission method of claim 15, wherein the processing of the input two time domain sub-data streams by the STBC processor through the second predetermined algorithm comprises:

$D_k^1\left(s\right)=-{\left[D_{k2}\left(s\right)\right]}^{*},$ $D_k^2\left(s\right)={\left[D_{k1}\left(s\right)\right]}^{*},$ wherein s is 0, 1^*Is conjugation of said D_k1(s) is a frequency domain sub-stream D_k1The s element of (a), the D_k2(s) is a frequency domain sub-stream D_k2The s element of (a), the D_k ¹(s) is a frequency domain coding sequence D_k ¹And k is the sequence number of the sending unit.

19. A space-time block code (STBC) method in a single carrier frequency division multiple access (SC-FDMA) system is characterized by comprising the following steps:

respectively processing the two data streams into conjugates of the original data streams to obtain two processed data streams;

multiplying the two processed data streams with a coding matrix P respectively, and taking one data stream obtained after multiplication as a coding sequence;

performing an inversion operation on the other data stream obtained after the multiplication to obtain another coding sequence, wherein the coding sequence is obtained

The T is the length of each data stream input.

20. A link receiving method in a single carrier frequency division multiple access SC-FDMA system, applied to the receiving unit of claim 8, the method comprising:

the first layered processing module receives the data which is output by the first data restructuring module and is used for rearranging and combining the frequency domain data after all resources are inversely mapped, and 2m is generated after frequency domain equalization and SIC elimination processing are carried out₀Outputting the information bit stream, and outputting the 2m₀The information bit stream is sent to the next layered processing module, and the next layered processing module processes the information bit stream and outputs 2m₀An information bit stream, and the 2m₀Sending the information bit stream to the next hierarchical processing module for processing until the K/m₀The last 2m is output after being processed by the layered processing module₀Personal informationAn information bit stream;

wherein, the K/m₀Each hierarchical processing module comprises: multiple-input multiple-output (MIMO) frequency domain equalization FDE module, second data reconstruction module and 2m₀An IDFT module, a third data reorganization module, and m₀Individual constellation demodulation module, m₀A channel coding module from 1 st to Kth/m₀-the 1 hierarchical processing module further comprises: the system comprises a recoding module, a channel gain module and a continuous interference SIC module;

the MIMO FDE module receives frequency domain data input from the outside of the hierarchical processing module where the MIMO FDE module is located, and sends the FDE-processed frequency domain data to the second data reconstruction module;

the second data reconstruction module rearranges and combines the frequency domain data to generate 2m₀The frequency domain sub-data streams are respectively input into corresponding inverse Fourier transform (IDFT) modules; the IDFT module is used for processing the 2m subjected to IDFT₀The frequency domain sub-data streams are output to a third data recombination module; the third data recombination module rearranges and combines the frequency domain subdata to generate m₀The frequency domain data streams are respectively input to corresponding constellation demodulation modules; the data stream after constellation demodulation is output to a channel decoding module by a constellation demodulation module; channel-decoded 2m by a channel decoding module₀Outputting an information bit stream; from the 1 st to the Kth/m₀-the channel decoding module of the 1 layered processing modules further decodes the 2m₀Sending the information bit stream to a recoding module;

the recoding module comprises a channel coding module, a constellation modulation module, a data distribution module, a Fourier transform DFT module, a space-time block code coding STBC device and a fourth data recombination module, wherein the constellation modulation module receives m₀After constellation modulation is carried out on the data, a time domain data stream is formed and sent to a data distribution module; the data distribution module receives the time domain data stream input by the constellation modulation module for distribution, and outputs two time domain sub-data streams with the same data volume obtained after distribution to the STBC device; the STBC carries out processing of a first preset algorithm on two input time domain sub-data streams, and the two obtained data volumes are the same and are transmittedThe time domain coding sequence arranged in the diversity sequence is output to the DFT module; after the DFT module carries out DFT processing on the two input time domain coding sequences, the two obtained frequency domain coding sequences with the same data quantity are output to the fourth data recombination module for rearrangement and combination;

or, the data splitting module receives the time domain data stream input by the constellation modulation module for splitting, and outputs two time domain sub-data streams with the same data volume obtained after splitting to the DFT module; after DFT processing is carried out on the two input time domain sub-data streams by a DFT module, the two obtained frequency domain sub-data streams with the same data volume are respectively output to the STBC device; the STBC carries out processing of a second preset algorithm on two input frequency domain sub-data streams with the same data volume to obtain two frequency domain coding sequences with the same data volume and arranged in the sequence of the transmission diversity, and the two frequency domain coding sequences are output to the fourth data recombination module for rearrangement and combination;

outputting, by the fourth data reassembly module, the rearranged and combined frequency-domain encoded sequences to a channel gain module; the channel gain module carries out channel estimation on the received rearranged and combined frequency domain coding sequence and then outputs the frequency domain coding sequence after the channel estimation to the SIC module;

the SIC module receives frequency domain data input from the outside of the hierarchical processing module, carries out SIC processing on the frequency domain data and the frequency domain coding sequence received from the channel gain module, and sends the processed frequency domain data to the MIMO FDE module in the next hierarchical processing module, namely the non-Kth/m-th hierarchical processing module₀The frequency domain data is also sent to a SIC module in the next hierarchical processing module by each hierarchical processing module;

k is the total number of output information bit streams, m₀Is an integer divisible by K.

21. The receiving method of claim 20, wherein the splitting of the time domain data stream by a data splitting module comprises:

and carrying out odd-even distribution on the time domain data stream by a data distribution module to obtain two time domain sub-data streams with the same data quantity, namely an odd sub-data stream and an even sub-data stream.

22. The receiving method of claim 20, wherein the processing by the STBC processor of the input two time-domain sub-data streams by the first predetermined algorithm comprises:

$d_k^1=P{\left[{\left[d_{k1}\right]}^H\right]}^T,$

$d_k^2=-P{\left[{\left[d_{k2}\right]}^H\right]}^T,$

wherein, the

The above-mentioned^TTo be transposed, the^HFor conjugate transpose, M is 1/2 of the number of data in the time domain data stream, and k is the sequence number of the sending unit.

23. The receiving method of claim 20, wherein the processing by the STBC processor of the input two time-domain sub-data streams by the second predetermined algorithm comprises:

$D_k^1\left(s\right)=-{\left[D_{k2}\left(s\right)\right]}^{*},$ $D_k^2\left(s\right)={\left[D_{k1}\left(s\right)\right]}^{*},$ wherein s is 0, 1, M-1, said^*Is conjugation of said D_k1(s) is a frequency domain sub-stream D_k1The s element of (a), the D_k2(s) is a frequency domain sub-stream D_k2The s element of (a), the D_k ¹(s) is a frequency domain coding sequence D_k ¹And k is the sequence number of the sending unit.

24. A method for link transmission in a single carrier frequency division multiple access, SC-FDMA, system, the method comprising: a transmission method as claimed in claim 15 and a reception method as claimed in claim 20.

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