多天线下结合BLAST与STBC算法的HARQ模型研究

A Novel HARQ Scheme Base on BLAST Combine STBC in MIMO System

提出多天线阵列中基于BLAST和STBC结合的HARQ算法.通过基于不同的空时码发射矩阵,推荐的算法可以分为基于正交发射矩阵的BLAST和STBC结合的HARQ算法以及基于准正交发射矩阵的BLAST和STBC结合的HARQ算法.推荐的算法不是如参照的算法BLAST+HARQ那样简单重传同样的信号,而是传输发射矩阵的下一行并联合进行空时码最大似然解码,这样推荐的算法可以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.特别是本算法可以适用于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.本算法结合了BLAST和STBC以及HARQ的优势,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.

Proposed a HARQ scheme base on comparison of BLAST and STBC in MIMO system. For base on different matrix, the proposed method can be divided to two parts, the first is HARQ base on orthogonal STBC compare BLAST, second is HARQ base on quasi-orthogonal STBC compare BLAST. The comparison method simply retransfer signal, but the proposed method transfer the next line of matrix and joint-decode them as STBC Maximum likelihood method, so that can benefit from spatial diversity. At good condition of channel, the proposed method get spatial multiplexing for retransfer hardly occur. The proposed HARQ scheme can apply in any MIMO system that receiver more than transfer. The proposed method have the advantage of BLAST and STBC also HARQ, that is a HARQ scheme can improve transmit rate and improve resistance of interference at same time.