公开(公告)号：US10333687B2

公开(公告)日：2019-06-25

申请号：US15319805

申请日：2014-10-20

Applicant: ZTE CORPORATION

Inventor： Chaowei Wang ,  Chen Huang ,  Cheng Wang ,  Nan Li ,  Mingxia Cao ,  Tian Cai ,  Yihuai Zhang

IPC: H04L5/14 ,  H04B7/06 ,  H04B7/0452 ,  H04B7/0456 ,  H04L25/03

Abstract: 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′; the receiver calculates, based on V′, U again to obtain a receiving matrix U′ according to the interference alignment condition; and the transmitter transmits a signal according to feedback information and V′, and the receiver filters the signal according to U′.

公开(公告)号：US10069545B2

公开(公告)日：2018-09-04

申请号：US15102902

申请日：2014-06-16

Applicant: ZTE Corporation

Inventor： Chaowei Wang ,  Nan Li ,  Wanfang Zhang ,  Cheng Wang ,  Xiao Zhang ,  Shuai Wang ,  Chen Huang

IPC: H04B7/04 ,  H04B7/0452 ,  H04L25/03 ,  H04B7/024 ,  H04B7/06 ,  H04B7/0456 ,  H04L1/00 ,  H04W72/08 ,  H04W72/00 ,  H04L5/00 ,  H04W88/02 ,  H04W88/08

Abstract: 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.