Interference suppression precoding method of large-scale fading MIMO system based on channel inversion technology

Abstract

The invention discloses an interference suppression precoding method of a large-scale fading MIMO system based on channel inversion technology. The method comprises the following steps: S1, an OFDM (Orthogonal Frequency Division Multiplexing) cellular communication network area group consisting of a plurality of cells is selected and channel estimation is made by a base station according to an uplink signal and an uplink pilot training sequence sent by a user to obtain a large-scale fading factor; S2, all the base stations send the corresponding large-scale fading factors to the network hub controller of the belonging area group, and a large-scale fading matrix is formed according to the relative positions of the base stations and the users; and S3, after the large-scale fading matrix ofthe region group is obtained, normalization processing is carried out on the large-scale fading matrix by using a channel inversion technology to obtain an interference suppression precoding matrix.According to the invention, the channel transmission rate of the multi-user MIMO system can be increased through channel inversion normalization under the condition that the number of base station antennas is not changed, and the effects of suppressing interference and eliminating noise are achieved.

Description

technical field [0001] The invention relates to the field of communication channel transmission, in particular to an interference suppression precoding method for a massive fading MIMO system based on channel inversion technology. Background technique [0002] The transmission of information has become an indispensable part of life, therefore, wireless communication has become one of the main means. However, there are still many problems in the use of wireless communication: pollution, noise, interference. In the multi-user MIMO large-scale antenna system LSAS, a single base station has a large number of antennas to serve a small number of users. In the process of exploring and improving communication performance, using the asymptotic theory based on random matrix theory, it was found that when the number of base station antennas of the large-scale antenna system LSAS using the TDD time division multiplexing protocol increases, the noise and interference in channel transmis...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the anti-interference precoding in the prior art is based on a large number of base station antennas, and the number of antennas has reached hundreds or even thousands, resulting in an increase in base station equipment costs and operating costs, and a large number of antennas is also It causes difficulties in practical application. When it is necessary to improve the communication quality, it is necessary to add hundreds of antennas, resulting in the design complexity of the antenna array is too high. Provide an interference suppression precoding for massive fading MIMO systems based on channel inversion technology method, using the large-scale fading factor obtained by channel estimation, applying channel inversion technology to LSFP, and obtaining an improved anti-interference precoding A-LSFP, which can eliminate pilot pollution, The performance of noise and interference is not affected, and the communication transmission rate is effectively improved under the same number of antennas

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