一种基于信噪比的HARQ自适应合并算法

Adaptive combining scheme of HARQ based on signal-to-noise

目前无线通信中广泛使用的HARQ合并技术主要是Chase合并和递增冗余(IR)合并。针对Chase合并在低信噪比下性能受限,递增冗余(IR)合并实际应用复杂的问题,提出了一种基于信噪比的自适应合并算法,通过实时估计信道的信噪比,综合使用Chase合并和递增冗余(IR)合并,实现了系统性能和实现复杂度的统一。仿真结果表明,算法是切实可行的。

The combining technology of HARQ are Chase combining and Incremental Redundancy（IR） generally.However, the performance of Chase combining is not excellent at low signal-to-noise channels and IR combining is complex to be realized.This paper proposes an adaptive combining algorithm based on signal-to-noise.With the real time estimation of channel signal-to-noise, this algorithm uses Chase combining and IR combining synthetically, which unifies performance and complexity of the system.The simulation results indicate that the new adaptive combining scheme is feasible.