Interference elimination method based on effective channel parameter semi-orthogonal

A channel parameter and interference elimination technology, applied in digital transmission systems, baseband system components, error prevention, etc., can solve problems such as high signaling overhead, inability to obtain beams, and no real reduction of system interference signals

Inactive Publication Date: 2012-07-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] 1. Interference randomization only whitens the interference, and does not really reduce the interference signal of the system, and the improvement of the signal-to-noise ratio is limited;
[0005] 2. At present, the existing interference cancellation technology has high complexity and strict application conditions, and can only eliminate some strong interference sources. In actual systems, interference is mainly produced by the superposition of many small interferences. Therefore, this technology is practical Li

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  • Interference elimination method based on effective channel parameter semi-orthogonal
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  • Interference elimination method based on effective channel parameter semi-orthogonal

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] Such as figure 1 and figure 2 As shown, the interference elimination method based on effective channel parameter semi-orthogonality of the present invention comprises the following steps:

[0037] (1) Cell α and neighboring cell β jointly set the precoding matrix P=[f 1 , f 2 ,... f S ,0,...0] M*M , where f 1 , f 2 ,...,f s Represents any S M*1 orthonormal basis, M is the number of transmitting antennas, and the base station and all users of cell α and neighboring cell β know P;

[0038] (2) The base station of cell α sends the first channel estimation signal and the second channel estimation signal to all N users of cell α and all N users of neighboring cell β respectively, and all N users of cell α receive the first channel estimation signal, the kth user in cell α calculates the first channel estimation value H according to the first channel estim...

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Abstract

The invention discloses an interference elimination method based on effective channel parameter semi-orthogonal, comprising the steps of: calculating an effective receiving channel parameter of a user side and regarding the parameter as the basis for the selection of a semi-orthogonal user by a base station according to effective channels and cross channel parameters fed back by a user. After selecting the semi-orthogonal user of the effective receiving channel parameter by the base station, double-layer pre-coding vector design is carried out by the base station so as to eliminate the interference among cells and in the cells. Through the interference elimination method based on effective channel parameter semi-orthogonal, the average user capacity can be improved and the computation time complexity for the selection of the semi-orthogonal user is greatly reduced.

Description

technical field [0001] The present invention relates to inter-cell and intra-cell interference alignment technology, more specifically, the present invention relates to an interference elimination method based on effective channel parameter semi-orthogonality. Background technique [0002] A multiple input multiple output (Multiple Input Multiple Output, MIMO for short) technology is a typical full-frequency multiplexing technology that can obtain diversity multiplexing gain. However, when MIMO technology is used in a full-frequency multiplexing environment, the same-frequency interference from adjacent cells and the interference from multiple users in the cell will seriously affect the receiving signal-to-noise ratio of the desired user, resulting in the transmission rate of the communication system and the quality of the service. The quality has dropped drastically. Usually, when the MIMO cooperation mode is adopted, the most commonly used interference suppression technol...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L1/00
Inventor 王德胜程文迪林宏志刘应状吕伟杨逸帆齐飞田科亮杨波
Owner HUAZHONG UNIV OF SCI & TECH
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