Zte Corporation

Chaowei Wang

Nan Li

Cheng Wang

Chen Huang

Xiao Zhang

Shuai Wang

Mingxia Cao

Wanfang Zhang

Tian Cai

Yihuai Zhang

Disclosed are a method and apparatus for interference alignment based on codebook design and selection. The method includes: a codebook set including codebooks of different sizes of a precoding matrix is pre-designed or pre-stored; a receiver or a transmitter selects a codebook satisfying a specified condition from the codebook set to explicitly or implicitly notify the opposite end; the receiver designs, based on obtained ideal CSI and an interference alignment condition, a precoding matrix V and a receiving matrix U for interference alignment; the receiver selects a matrix V' having the highest similarity to V from the current codebook to serve as a finally quantized precoding matrix V&#x2032;; the receiver calculates, based on V&#x2032;, U again to obtain a receiving matrix U&#x2032; according to the interference alignment condition; and the transmitter transmits a signal according to feedback information and V&#x2032;, and the receiver filters the signal according to U&#x2032;.

Method and apparatus for implementing interference alignment on the basis of codebook design and selection

Provided is a method for interference alignment applied to a multi-cell and multi-user Multiple Input Multiple Output (MIMO) system. The method includes that: a BS divides multiple users in a cell into a plurality of user groups, and notifies the multiple users of grouping information; and when one of the plurality of user groups is interfered by a neighbor cell, users in the one of the plurality of user groups cooperate with each other to perform interference alignment. The disclosure also provides a pre-coding method and system based on interference alignment. The disclosure, by means of grouping and cooperation of the users and designing of a receiving matrix of each user, achieves the effect of interference alignment in a signal transmission space of the BS.

Pre-coding system and method based on interference alignment

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Shenzhen, China

Chaowei Wang