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SFBC (Space Frequency Block Code) transmission diversity method for two-dimensional antenna array

A two-dimensional antenna and transmit diversity technology, applied in the directions of space transmit diversity, diversity/multi-antenna systems, etc., can solve the problems of inability to support multi-user transmit diversity, limited and other issues

Inactive Publication Date: 2016-10-05
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] At present, the maximum number of ports supported by the above-mentioned SFBC transmit diversity method is 4, and this method is limited by the SFBC encoding process, which is only applicable to single-user data and cannot support multi-user transmit diversity

Method used

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  • SFBC (Space Frequency Block Code) transmission diversity method for two-dimensional antenna array
  • SFBC (Space Frequency Block Code) transmission diversity method for two-dimensional antenna array
  • SFBC (Space Frequency Block Code) transmission diversity method for two-dimensional antenna array

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Embodiment 1

[0038] The operating principle block diagram of the inventive method is as Figure 4 As shown, the data is first divided into M layers, and then the M layer data is subjected to SFBC encoding operation with vertical precoding processing, and the encoding result is mapped to M*N antenna ports. This method can further improve the transmit diversity gain of a single user through vertical beamforming. The present embodiment takes the situation of M=2, a single user as an example to specifically illustrate the SFBC transmission diversity method of the present invention, and the SFBC coding operation that adds vertical precoding processing is represented by the following formula:

[0039] y ( 0 ) ( 2 i ) ...

Embodiment 2

[0049] This embodiment takes the situation of M=4, single user as an example to specifically illustrate the SFBC transmission diversity method of the present invention, and the SFBC coding operation that adds vertical precoding processing is represented by formula 1-1:

[0050] The W in it adopts the 4-port SFBC coding matrix in the LTE R8 version.

[0051] At this time, the two-dimensional antenna array is a transmitting antenna port with a size of 4*N, respectively represented as antenna 0, antenna 1, antenna 2, antenna 3, ... antenna 4N-1, all antennas are divided into N groups, and the first group includes antennas 0. Antenna 1, Antenna 2, and Antenna 3. Group 2 includes Antenna 4, Antenna 5, Antenna 6, and Antenna 7. Other groups are analogous in sequence. a data sequence {S 0 ,S 1 ,S 2 ,S 3 ,...}, divided into four layers x (0) (i), x (1) (i), x (2) (i) and x (3) (i), x (0) (i)={S 0 ,S 4 ,...},x (1) (i)={S 1 ,S 5 ,...},x (2) (i)={S 2 ,S 6 ,...},x (3) (i...

Embodiment 3

[0054] In Embodiment 1 and Embodiment 2, user data is divided into M layers, but this embodiment further illustrates how to support transmission diversity of user data with more layers. In this embodiment, users are first divided into T groups, and each group of data is further divided into M layers, and user data is actually divided into M*T layers.

[0055] Carry out the SFBC coding operation of the M port adding vertical precoding processing to each group of data respectively, obtain the data vector of each antenna port of each group, then superimpose and send the data vectors of the multiple groups of each port, wherein each group The data all use the same W matrix, and the P vectors used in the SFBC encoding operation of each group of data form a matrix P, as follows:

[0056] P = x 00 x 01 ...

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Abstract

The invention provides a SFBC (Space Frequency Block Code) transmission diversity method for a two-dimensional antenna array. The antenna port numbers in a horizontal direction and a vertical direction of the two-dimensional antenna array are M and N. The method comprises steps: user data are divided into M layers, SFBC coding operation with vertical pre-coding processing added is carried out on the M layers of data, the coding operation result is mapped to all antenna ports, and the SFBC coding operation with vertical pre-coding processing added is expressed by the following equation as shown in the descriptions, wherein W is an M-port SFBC coding matrix of M<2>*2M, P is a column vector, P=[x0 x1...xN-1]<T>, the formula of xk is shown in the descriptions, q belongs to {0,1,...,Q-1}, k=0,1,...,N-1, Q is a positive integer no smaller than N, and W and P do product for Kronecker.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a SFBC transmission diversity method of a two-dimensional antenna array. Background technique [0002] In the R8 version of the Long-Term Evolution system (Long-Term Evolution), there are multiple downlink transmission modes, among which the TM2 transmission mode adopts a SFBC (Space Frequency Block Code, Space Frequency Block Code) transmission diversity method. The block diagram of the operation principle is as figure 1 As shown, the data is first divided into M layers (M is the number of ports), and then the M layer data is subjected to SFBC encoding of M ports, and the encoding result is mapped to M antenna ports. The SFBC encoding process is expressed by the following formula: [0003] y ( i , 0 ...

Claims

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Application Information

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IPC IPC(8): H04B7/06
Inventor 周欢孙鹏
Owner BEIJING XINWEI TELECOM TECH
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