Interference Suppression Precoding Method Based on Cooperative Femtocells in Two-layer Heterogeneous Networks

Abstract

The invention discloses an interference suppression precoding method based on cooperative femtocells in a two-layer heterogeneous network: firstly, the QR decomposition method is used to eliminate the same-layer interference between multiple macrocell users and multiple femtocell users Interference, the first part of the precoding matrix is ​​obtained, and this part is combined with the known channel information to form an equivalent channel; using the equivalent channel information, the macro cell base station adopts the maximization of SNR to suppress the cross-layer interference generated by the macro cell users , to obtain the second part of the macrocell user precoding matrix, the femtocell base station adopts the minimum mean square error criterion and adds the cross-layer interference restriction condition to suppress the cross-layer interference generated by the femtocell user, and obtains the femtocell user precoding matrix The second part; finally combine the two parts of the precoding matrix to obtain the required precoding matrix. The invention effectively suppresses the same-layer and cross-layer interference, and improves the transmission rate of macrocell users and femtocell 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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