基于OMNeT++的认知无线电MAC协议仿真研究

OMNeT + + simulation study of cognitive radio based MAC protocol

为了解决日益紧张的无线通信频谱资源,充分利用授权用户的频谱空穴,认知无线电应运而生,利用开源、模块化结构的面向对象离散网络仿真器OMNeT++,在前人研究的基础上,使用3次握手信号征用信道,通过增加协作感知阶段实现了基于重叠的CR MAC协议,在此基础上,通过设置仿真实验,利用吞吐量与负载评估比较了几种协议的优劣。研究结果表明,增加了协作感知阶段的CrMac2能够在感知时间内,确保不给主用户带来有害干扰的前提下有效感知主用户的活动,负载越大,被遗漏的主用户数越少,即空闲频谱的利用率越高。

Cognitive radio emerges in order to solving the increasingly scarce spectrum resources of wireless communication and making full use of spectrum hole of authorized users. The protocol CrMac2, an overlay-based CR MAC protocol with collaboration sensing stage, is presented on the basis of previous researches, and is implemented through using 3 handshake signal acquisition channel in the paper. Then, the simulation experiment is setting to evaluating and comparing the merits of CrMac1, CrMac2 and the one no nodes by the relationship of throughput and load. The results show that, the protocol CrMac2 which increasing collaboration sensing stage, can effectively detect the primary users activities within the scope sensing time, under the premise of ensuring without harmful interference to the primary users, when loads are high, missing the primary number less, and the utilization of the spectrum more.