【摘要】 在自适应调制和功率控制下研究了部分窗口多拒绝选择重传协议下的性能,并推导出吞吐量跟自适应调制关系的一般表达式,从理论分析和数值计算的结果都表明,结合自适应调制的ARQ系统可以对抗衰落,功率控制可以动态跟踪无线环境变化并克服由于信道环境时变造成的功率控制失误问题,降低干扰信号强度,提高能量效率和系统容量。更多还原

【Abstract】 The scheme of hybrid selective repeat automatic repeat request(SR_ARQ) with adaptive modulation(AM) system and power control is discussed.And the throughput expression is derived.Theoretic analysis and numerical calculation all show that HARQ combined with AM and power control will have a better performance than that of conventional ARQ schemes.Power control tracks the variation of the radio environment changes with self-adaptive prediction technique,as a result,it reduces the power control error and standard deviation of receiver SINR(signal-to-interference-ratio),higher energy efficiency,and thus better system capacity.更多还原