Method and device for realizing interference alignment based on design and selection of codebooks

Abstract

The invention discloses a method and device for realizing interference alignment based on design and selection of codebooks, wherein the method comprises the following steps that: a receiving end and a transmitting end pre-design a codebook set of a pre-coding matrix, wherein the codebook set contains codebooks of different sizes; the receiving end or the sending end selects a codebook conforming to a specified condition from the codebook set, takes the codebook as the current codebook, and informs an opposite end in a display or implicit manner; the receiving end designs a pre-coding matrix V and a receiving matrix U for realizing interference alignment based on obtained ideal channel state information and an interference alignment condition; the receiving end selects a matrix V' having the highest similarity with the pre-coding matrix V from the current codebook, and takes the matrix V' as a finally quantified pre-coding matrix V'; the receiving end calculates the receiving matrix U again according to the interference alignment condition based on the quantified pre-coding matrix V' so as to obtain a receiving matrix U'; the transmitting end is used for transmitting a signal according to the quantified pre-coding matrix V' based on feedback information; the receiving end filters the signal according to the receiving matrix U'; and thus, interference alignment is realized.

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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