摘要
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。
A HARQ-based linear precoding scheme was proposed to utilize the flexibility of the post-combining hybrid automatic repeat request （HARQ） strategy and to allocate appropriate symbols and powers for all the eigen-modes in multi-input-multi-output systems. The scheme obtains the precoding gains for each transmission and averages the reliabilities of all the retransmitted symbols to acquire more spatial diversity gains. Simulation results show that the scheme achieves about 5. 5 dB signal-to-noise ratio gains over the original spatial multiplexing scheme at a hit error rate of 10^-4. Furthermore, the improvements enlarge with increasing number of transmissions.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第4期551-554,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(90204001)
关键词
无线通信
多天线系统
混合自动重传请求
线性预编码
wireless communication
multi-input-multi-output systems
hybrid automatic repeat request
linear precoding
