【摘要】 在多天线无线通信系统中,发射机利用来自接收机有限反馈的信道方向信息,能够提高系统容量和降低误码率.有限反馈的关键是码本设计,本文综述了近年来这一领域的研究成果.码本设计主要包括基于Grassmann流形中子空间包和基于信源编码中向量量化的两种方案,涉及对象包括不同类型的多天线信道和发射数据流模式.详细介绍了这两种方案的原理和相应算法,并比较了它们的异同点.更多还原

【Abstract】 In multiple-antenna wireless communication systems,when the transmitter obtains the quantized channel direction by a limited feedback link from the receiver,benefits of improving throughput and reducing bit error rate can be realized.This paper presents an overview of codebook design for limited feedback,which is the most important problem in the system.The codebook de- sign can mainly classified as two schemes:one based on subspace packing in Grassmann manifold and another based on vector quan- tization in source coding.We highlight the principles and related algorithms of both schemes,which involve various modes about channels and data,and then compare the key characteristics of them.更多还原