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Method for equalizing low-complexity cooperative relay system

A technology of cooperative relay and system equalization, applied in baseband system components, diversity/multi-antenna systems, shaping networks in transmitters/receivers, etc. The application of cooperative relay system and other problems, to achieve the effect of low computational complexity and good system performance

Active Publication Date: 2011-06-01
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

However, in the cooperative relay system based on DLC-STC, the inconsistency of the path lengths from each relay node to the destination node will cause the symbol sequences sent by each relay node to reach the destination node with different delays amount, which in turn leads to the asynchronous superposition characteristics of each group of symbol sequences received
Therefore, the equalization method in the traditional MIMO system will not be well applicable to the cooperative relay system

Method used

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  • Method for equalizing low-complexity cooperative relay system
  • Method for equalizing low-complexity cooperative relay system
  • Method for equalizing low-complexity cooperative relay system

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Embodiment Construction

[0019] Suppose the length of the source data vector s is L, the length of the channel transmission data vector is N, the generator polynomial order of the DLC-STC codeword is M, the number of relays included in the cooperative relay system is R, and the relays indicate Mark r=1, 2,..., R, according to figure 1 The schematic diagram of the cooperative relay system model structure based on the DLC-STC codeword is shown, and the expression of the received signal at the destination node is shown in Equation 1:

[0020] y = Σ r = 0 R - 1 h r G ~ r s + n

[0021] = Hs + n

[0022] Formula 1

[0023] Among them, y is the receiving vector at the destination node of N×1, n is the...

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Abstract

The invention discloses a method for equalizing a low-complexity cooperative relay system, which can be applied in the cooperative relay system on the basis of distributed linear convolution time codes. The method provided by the invention can keep fully cooperative diversity gain and has high system performance in an actual signal-to-noise range. Compared with the traditional linear equalizing method such as zero forcing equalization and minimum mean square error equalization, the method has reduced computation complexity by simplifying a zonal toeplitz linear system for solving a high orderinto a toeplitz linear system for solving a low order. Meanwhile, the method is suitable for a random convolution linear system and only requires an equivalent channel matrix in a final receiving expression of a communication system to meet the characteristics of a zonal toeplitz matrix.

Description

technical field [0001] The present invention relates to the technical field of equalization in mobile communication, in particular to a linear equalization method based on distributed linear convolutional space-time codes (distributed linear convolutional space-time codes, DLC-STC for short) applied to a cooperative relay system. Background technique [0002] The basic problems faced by traditional cellular communication systems are limited capacity due to limited bandwidth and decreased communication reliability due to time-varying multipath fading. If you continue to adopt this network structure, it will not be able to meet the requirements of future wireless applications. Relay technology amplifies or decodes and forwards the signal between the base station and mobile users by placing some fixed or mobile relay stations with relatively simple functions in the cell, which can reduce the transmission power of the signal, extend the coverage of the base station, and eliminat...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L25/03H04B7/08
Inventor 尤肖虎蒋雁翔肖俊
Owner SOUTHEAST UNIV