一种改进的IR-HARQ功率分配方案

为了保证信息在无线衰落信道条件下的稳定传输,提出了一种基于正交幅度调制(Quadrature Amplitude Modulation,QAM)的增量冗余混合自动重传请求(Incremental Redundancy Hybrid Automatic Repeat Request,IR-HARQ)功率分配方案,计算了基于QAM的IR-HARQ传输链路的互信息,以提高数据吞吐率为目的提出了混合传输策略.在瑞利衰落信道下将该方案与最大化互信息策略和逆信道策略进行Matlab仿真比较,结果显示提出的混合传输策略有更高的数据吞吐率,且随着重传次数的增加,数据吞吐率迅速接近遍历容量.

An improved IR-HARQ power allocation scheme

In order to ensure the stable transmission of information under wireless fading channel conditions,an incremental redundancy hybrid automatic repeat request(IR-HARQ) power allocation scheme based on quadrature amplitude modulation(QAM) is proposed.The mutual information of the IR-HARQ transmission link based on QAM is calculated,and a hybrid transmission strategy is proposed to improve the data throughput.Under Rayleigh fading channel,the proposed scheme is compared with the maximization mutual information scheme and the inverse channel scheme.The simulation result by Matlab shows that the proposed hybrid transmission scheme has a higher data throughput rate,and with the increase of retransmission times,its data throughput rate approaches the ergodic capacity quickly.