【摘要】 基于正交频分复用(OFDM)系统提出一种自适应混合自动重传请求(HARQ)方案,它充分利用发送端获得的信道状态信息对每次重传数据符号进行重组并且采用星座重组方案平均调制符号内各比特间的可靠性差异。仿真分析表明,自适应HARQ方案与星座重组方案相结合大大提高了系统通过率、降低误块率和传输时延。更多还原

【Abstract】 An adaptive hybrid automatic repeat request(HARQ)scheme was proposed based on orthogonal frequency division multiplexing(OFDM)system.It utilized the channel state information fully to rearrange symbols at each retransmission.Constellation rearrangement technology was also adopted to average bit reliabilities within a symbol.Simulation results show that the proposed scheme improves the throughput of the system significantly and greatly reduces the block error rate and transmission delay.更多还原