针对Charm(channel-aware rate selection algorithm)算法在瑞利平坦衰落信道下误码率性能较差的问题,提出了M-Charm(modified Charm)速率自适应算法。该算法基于Charm算法,通过调整信噪比估计参数,增加差值补偿机制,以提高信道估计的准确性,进而降低了误码率。在瑞利平坦衰落信道模型下的仿真结果表明,M-Charm算法不仅保持了较好的吞吐量性能,而且大大改善了误码率性能。
Aiming at the problem of Charm having poor BER performance in Rayleigh flat fading channel,this paper put M-Charm algorithm forward based on Charm.The algorithm improved the accuracy of channel estimation to reduce BER by adjusting signal-to-noise ratio estimation parameters and adding difference compensation mechanism.Simulation result in Rayleigh flat fading channel model shows that M-Charm algorithm not only keeps good throughput performance,but also improves BER performance greatly.