Cooperative femtocell-based interference suppressing precoding method in double-layer heterogeneous network

Abstract

The invention discloses a cooperative femtocell-based interference suppressing precoding method in a double-layer heterogeneous network. The method comprises the following steps: firstly, eliminating the interference in the same layer among a plurality of macrocell users and among a plurality of femtocell users through a QR decomposition method, so as to obtain the first part of a precoding matrix, combining the first part and known channel information, so as to form an equivalent channel, suppressing cross-layer interference produced by the macrocell users by a macrocell base station adopting signal-to-leakage-and-noise ratio maximization rule through equivalent channel information, so as to obtain the second part of the precoding matrix of the macrocell users, and finally combining the two parts of precoding matrixes, so as to obtain a required precoding matrix. The method effectively suppresses interference in the same layer and cross-layer interference, and increases the transmission speed of the macrocell users and the macrocell users.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to an interference suppression precoding method based on cooperative femtocells in a two-layer heterogeneous network. Background technique [0002] At present, the increasing number of indoor wireless communication users and the increasing service demands of these wireless communication users have become the main factors restricting the development of communication. However, the service capability of the traditional macro cell base station is limited, and indoor users are generally far away from the macro cell base station, which results in serious transmission signal power fading, which leads to the inability of the macro cell base station to meet the needs of indoor users. Therefore, femtocell base stations need to be arranged indoors to shorten the distance between indoor users and the base station, thereby improving the coverage of the base station, reducing the...

AI Technical Summary

Problems solved by technology

However, in a heterogeneous network, no matter whether it is a macro cell base station or a femto cell base station, both macro cell users and femto cell users need to be processed at the same time. Since these two types of users have a large number of antennas overall, this leads to the use of a single When the criterion is used for interference suppression, space resources are not effectively used, which reduces the effect of interference suppression

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