A method and device for implementing interference alignment based on codebook design and selection

Abstract

The invention discloses a method and device for realizing interference alignment based on codebook design and selection. Wherein, the method includes: the receiving end and the transmitting end pre-design a codebook set of precoding matrices; wherein, the codebook set includes codebooks of different sizes; the receiving end or the transmitting end selects a code that meets a specified condition from the codebook set This book is used as the current codebook and is displayed or implicitly notified to the opposite end; the receiving end designs the precoding matrix V and the receiving matrix U for realizing interference alignment based on the obtained ideal channel state information and interference alignment conditions; In the codebook, the matrix V' with the highest similarity with the precoding matrix V is selected as the final quantized precoding matrix V'; the receiving end calculates the receiving matrix U again according to the interference alignment condition based on the quantized precoding matrix V' to obtain the receiving matrix U. '; the transmitting end uses the quantized precoding matrix V' to transmit signals according to the feedback information, and the receiving end filters the signals according to the receiving matrix U' to achieve interference alignment.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for implementing interference alignment based on codebook design and selection. Background technique [0002] Compared with 3G technology, LTE system has attracted much attention and praise for its high data rate, flexible spectrum configuration, packet transmission, low delay, wide coverage and good backward compatibility. The LTE system also defines two different duplexing modes: frequency division duplexing (Frequency Division Duplexing, FDD) and time division duplexing (Time Division Duplexing, TDD). Among them, FDD is to receive and transmit on two separate symmetrical frequency channels, and use the guard frequency band to separate the receiving and transmitting channels. Therefore, FDD must use paired frequencies and rely on frequencies to distinguish uplink and downlink. Resources are continuous in time. When FDD supports symmetrical services, it can make f...

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problem that the ideal channel state information cannot be obtained at the transmitting end in the LTE-FDD system in the related art, the present invention provides an interference alignment implementation method and device based on codebook design and selection to solve the above technical problems

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