多天线阵列中基于矩阵求逆的BLAST和准正交STBC结合的HARQ算法研究  

Novel HARQ Scheme Based on BLAST Combine STBC in MIMO System

作　　者：林宏志[1] 朱光喜[1] 刘应状[1] 敖娟[1] 王德胜[1] 

机构地区：[1]华中科技大学武汉光电国家实验室,武汉430074

出　　处：《计算机科学》2008年第9期56-58,共3页Computer Science

基　　金：国家"863"计划(编号2003AA12331005和2006AA01Z277);国家自然科学基金(编号60496315)资助

摘　　要：提出了多天线阵列中基于BLAST和准正交STBC结合的HARQ算法,并采用低复杂度的矩阵求逆方法进行解码。推荐的算法不是如传统的ARQ算法那样重传同样的信号,而是将数据组成准正交空时码发射矩阵,重传的时候传输发射矩阵的下一行,并和以前传输数据联合进行空时码解码。所以推荐的算法可以额外获得空时码的分集增益,而在信道条件好和信噪比高时,由于没有重传的发生而可以获得BLAST的复用增益。对于部分发射矩阵联合空时码解码,本文提出了采用矩阵求逆的解码算法。仿真表明该算法和最大似然算法的性能相近而复杂度下降很多。本算法结合了BLAST和STBC以及HARQ的优势并采用了低复杂度的矩阵求逆算法,是一个既能够提高系统传输速率也能够提高系统抗干扰性能的HARQ方案。特别是本算法在所有接收天线数大于等于发射天线数的多天线阵列中有很强的实用性。This paper proposes a HARQ scheme based on comparison of BLAST and quasi-orthogonal STBC in MLMO system, also proposes a matrix inversion decode method. Different from traditional ARQ, the proposed method transfers the next line of data matrix and joint-decode them as STBC. It can get additional spatial diversity form the retransmission and get spatial multiplexing in good channel condition for no retransmission. This paper proposes a matrix inversion algorithm to joint-decode data matrix. The simulation result shows matrix inversion algorithm has similar performance to Maximum likelihood method,also has much lower complexity. The proposed method has the advantage of BLAST and STBC also HARQ, it is a HARQ scheme that can improve transmit rate and improve resistance of interference at same time. Specially, the proposed HARQ scheme can apply in any MIMO system that receiver more than transfer, it has extensive application.

关 键 词：多输入多输出 贝尔实验室分层码 空时分组码 混和自动请求重传 

分 类 号：TN957.53[电子电信—信号与信息处理] TN929.5[电子电信—信息与通信工程]