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为了充分利用多天线系统中后合并混合自动重传请求(HARQ)结构的灵活性,合理分配每次重传数据的空间子信道及相应的功率,提出基于后合并HARQ的线性预编码方案。该方案不仅在单次数据传输时获得预编码增益,而且利用子信道置换平均重传符号之间的性能差异,进而获得更多的空间分集增益。仿真结果表明,当传输次数为4时,所建议的方案相对于空间复用方案在误比特率为10-4时约有5.5 dB的信噪比增益,并且随着重传次数的增加性能差异更加明显。
In order to make full use of the flexibility of hybrid HARQ structure in multi-antenna system and allocate space sub-channel of each retransmission data and corresponding power rationally, a linear pre-coding scheme based on post-HARQ is proposed. This scheme not only obtains the precoding gain when transmitting a single data, but also uses the subchannel to replace the performance difference between the average retransmitted symbols to obtain more space diversity gain. The simulation results show that when the number of transmission is 4, the proposed scheme has a signal-to-noise ratio gain of about 5.5 dB compared with the spatial multiplexing scheme when the bit error rate is 10-4, and the performance difference increases more with the number of retransmissions obvious.