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Method for determining linear dispersion space-time codes for receiving antenna numberless than transmitting antenna number

A technology of receiving antenna and transmitting antenna, applied in the field of channel coding, can solve problems such as loss of application value, and achieve the effect of good coding performance and simple coding design complexity

Inactive Publication Date: 2010-05-05
ZHEJIANG UNIV
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Problems solved by technology

There are various methods for designing the coding matrix. Among them, the trace-orthogonal space-time coding proposed by Fasano and Barbarossa has better operability, and can reach the theoretical ergodic channel capacity and full diversity gain. But it is only applicable when the number of receiving antennas is greater than the number of transmitting antennas
[0007] In practical applications, due to the size limitation of the mobile terminal, the number of antennas is often smaller than the number of antennas of the base station, so some space-time coding schemes that are only applicable to the number of receiving antennas greater than or equal to the number of transmitting antennas on the downlink, such as V-BLAST, will lose its application value

Method used

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  • Method for determining linear dispersion space-time codes for receiving antenna numberless than transmitting antenna number
  • Method for determining linear dispersion space-time codes for receiving antenna numberless than transmitting antenna number
  • Method for determining linear dispersion space-time codes for receiving antenna numberless than transmitting antenna number

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Embodiment Construction

[0025] System model:

[0026] Suppose the number of transmitting antennas is M, the number of receiving antennas is N, (N≤M) MIMO channel model see figure 1 .

[0027] Consider the case of T transmission time periods (that is, the number of times the channel is used is T), and the input-output relationship is expressed as

[0028] R=HX+v (1)

[0029] Among them, R is an N×T receiving matrix, which means that the N-dimensional column vector is received for a total of T times at each time. H is an NxM channel matrix which is flat (ie constant) over time T. X is an M×T transmission matrix, which means that M-dimensional column vectors are transmitted through M transmission antennas at each time, and T times are transmitted in total. V is an N×T complex Gaussian noise matrix.

[0030] X from the q-dimensional uncoded vector s=[s 1 ...s q ] T Encoding comes, q=min(MT, NT), when N≤M, when q=NT its encoding process is

[0031] X = Σ ...

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Abstract

The invention relates to a method for determining linear dispersion space-time codes when the receiving antenna number is less than the transmitting antenna number. Large limitation exists in the prior art. The method comprises the following steps of: firstly, determining channel using times T (T is not less than M) and constructing layered matrices C1-CN; then constructing N stepped matrices U1-UN in T*T; constructing q=NT encoding matrices Aj, K in M*T, wherein the j is equal to 1 to T, the k is equal to 1 to N, the M is the transmitting antenna number, the N is the receiving antenna number, Aj, k is equal to P.Ck.diag (Uk(:, j)).Q, NT encoding matrices Aj, k are obtained together, and then the linear dispersion space-time codes are determined. The method adopts a trace orthogonal method to achieve approximately optimal channel volume and uses an algebraic method to obtain full set gains. The linear dispersion space-time codes determined in the method of the invention have simple encoding design complexity and simultaneously provide favorable encoding properties.

Description

technical field [0001] The invention belongs to the technical field of channel coding, and relates to a method for determining a linear diffuse space-time code when the number of receiving antennas is less than the number of transmitting antennas in a channel of a multi-antenna system. A method for linear dispersive space-time codes with optimal channel capacity and maximum diversity gain. Background technique [0002] In recent years, MIMO (Multiple Antenna System) technology has become a hotspot in the field of wireless communication research due to the need to achieve higher transmission rates and better transmission performance in fading channels with limited energy and bandwidth. The advantage of MIMO technology is that it increases channel capacity, which can be directly converted into high data throughput, and at the same time, the reliability of data transmission is improved by using space diversity gain, that is, low bit error rate. [0003] Space-time code (space-...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04B7/06H04B7/08
Inventor 谢磊陈惠芳王徐敏王匡
Owner ZHEJIANG UNIV
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