Multi-cell and multi-user co-channel interference suppression method based on triangular decomposition and SLNR (Signal Leakage Noise Ratio) algorithm

A multi-cell multi-user, triangular decomposition technology, applied in baseband system components, shaping networks in transmitters/receivers, preventing/detecting errors through diversity reception, etc., can solve the complexity of receiver processing and increase the number of users Issues such as the number of matrices at the receiving end and the computational complexity

Active Publication Date: 2013-10-09
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, this undoubtedly increases the number of matrices and computational complexity at the user's receiving end, making the processing at the receiving end more complicated

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  • Multi-cell and multi-user co-channel interference suppression method based on triangular decomposition and SLNR (Signal Leakage Noise Ratio) algorithm
  • Multi-cell and multi-user co-channel interference suppression method based on triangular decomposition and SLNR (Signal Leakage Noise Ratio) algorithm
  • Multi-cell and multi-user co-channel interference suppression method based on triangular decomposition and SLNR (Signal Leakage Noise Ratio) algorithm

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with drawings and embodiments.

[0023] Such as figure 1 As shown, taking 3 cell base stations and 2 users in each cell base station as an example:

[0024] This embodiment takes the LTE downlink multi-cell multi-user network environment as the background, referring to figure 1 In the system model shown, all base stations in the model work on the same frequency resources, such as the macro cell (Marco cell), micro cell (Pico cell), and home base station (Femto cell) covered simultaneously in the LTE system, so the system There is serious inter-cell and intra-cell co-channel interference. Each user in the cell, especially the cell border users, in addition to being able to receive the useful signals of the cell, such as figure 1 The middle signal line indicates that it will also receive co-channel interference signals from other two cells, such as figure 1 The middle arrows indicate that at the same...

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Abstract

The invention relates to a multi-cell and multi-user co-channel interference suppression method based on triangular decomposition and an SLNR (Signal Leakage Noise Ratio) algorithm, belonging to the technical field of wireless communication. The method comprises the following steps of: (1) calculating the Frobenius norm of a channel matrix in each cell, and regulating row vectors of joint channel matrixes according to the sizes of the norms; (2) carrying out triangular decomposition on the regulated joint channel matrixes, so as to obtain equivalent channel matrixes; (3) calculating interference suppression matrixes of users in each cell according to equivalent received signals; and (4) calculating an equivalent pre-coding matrix of each user by utilizing the SLNR algorithm based on the equivalent channel matrixes which are subjected to the triangular decomposition. According to the multi-cell and multi-user co-channel interference suppression method, equivalent channel matrix models are obtained by utilizing the triangular decomposition, half inter-cell interferences are suppressed without carrying out other complex interference processing, and the residual inter-cell interferences are suppressed by utilizing the SLNR algorithm; and compared with a block diagonalization algorithm, an interference alignment algorithm of a receiving terminal and the like, the method has the advantages that the number of the matrixes of the receiving terminal can be reduced, and the calculation complexity can be simplified.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an interference suppression method for suppressing multi-cell multi-user downlink co-frequency interference. Background technique [0002] In the LTE next-generation broadband mobile communication system standard proposed by 3GPP, the multiple input multiple output (Multiple Input Multiple Output, MIMO) technology has received great attention because of its huge multiplexing gain. In the multi-user MIMO downlink, in order to improve frequency utilization, base stations in each cell reuse the same frequency, and base stations in each cell also transmit multiple data streams to multiple users on the same frequency, which makes it possible for each user Different degrees of co-channel interference (Co-Channel Interference, CCI) from users in this cell and other cells. If no effective preprocessing or interference suppression method is adopted, the system performance ...

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Application Information

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IPC IPC(8): H04L1/00H04L1/06H04L25/03
Inventor 张祖凡李余杨静彭醇陵景小荣
Owner CHONGQING UNIV OF POSTS & TELECOMM
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