MIMO系统中基于预编码的IR-HARQ方案

The IR-HARQ scheme based on precoding in MIMO system

多输入多输出系统与混合自动请求重传技术的结合,能够实现高的传输速率,提高系统的可靠性.该文主要针对多输入多输出系统中基于预编码的混合自动请求重传技术,提出将递增冗余的合并技术代替传统的Chase合并方案,递增冗余合并主要通过递增发送的码字的冗余度,以增大正确译码的概率,从而增加数据吞吐量.仿真结果表明,无论是误比特率还是信息速率,采用递增冗余的方案都能给系统带来增益.

MIMO （multiple input multiple output） system combined with the technology of HARQ （hybrid automatic repeat request） can achieve a high transfer rate and improve the system reliability. This paper proposes a scheme for the precoding-based HARQ in the MIMO system, which uses the incremental redundancy technology instead of the traditional Chase combining. Incremental redundancy combining can increase the probability of correct decoding mainly by increasingly sending the redundancy of the codeword, and thereby increase data throughput. Simulation results show that the incremental redundancy scheme can bring gain to the system from the perspectives of both BER and information rate.