自适应p坚持时隙ALOHA近似算法性能分析

Analysis of approximate algorithm about adaptative p-persistent slotted ALOHA

动态频谱共享通信系统(DSSCS)的分布式网络中使用p坚持时隙ALOHA作为媒体接入控制协议,MAC驱动不支持浮点运算。分析了动态自适应p坚持算法的工作原理,并针对该算法中需要进行对数运算的问题,提出了二进制移位和泰勒级数展开两种近似处理算法。对近似算法对系统性能的影响进行了数值计算和仿真测试,结果表明,该近似算法在降低了运算复杂度的基础上,能获得接近于p坚持理论算法相近的性能。

The distribution network of Dynamic Spectrum Sharing Communication System（DSSCS） uses p-persist slotted ALOHA as media access control protocol,but Media Access Control（MAC） driver does not support floating-point operations.After analyzing the principle of dynamic adaptive p-persistent algorithm（DA-pPAA）,and toward the issue of calculating the logarithm function,the replaceable algorithms as Binary Shifted Approximate Algorithm（BSAA） and Thaler Series Approximate Algorithm（TSAA） were proposed.The system performance of approximate algorithm was tested via numerical calculation and simulation.Test results show that the approximate algorithm has simplified the computational complexity,and can get the same performance as the p-persistent theoretical algorithm.