一种适用于698～806MHz频段的认知MAC协议

A cognitive radio based MAC protocol for Band 689～806 MHz

针对广播系统与认知系统共存场景下的认知用户接入问题,提出一种适用于698～806MHz频段的认知MAC协议。该协议以分布式的方式对授权信道侦听,认知用户之间以协调的方式共享信道侦听结果,并采用基于竞争的方式接入空闲授权信道。利用蒙特卡洛仿真方法对所提出的协议进行了仿真。仿真结果表明,与传统MAC协议相比,该协议能够有效提高授权频段的频谱利用率,提升系统性能。

A cognitive radio based MAC protocol for 698～806MHz is presented in this paper to address user access issues in the environment where the broadcast system and cognitive radio sys-tem coexist.In this proposed scheme,the authorized bands is sensed in a distributed way,and the spectrum sensing information can be shared coordinately among secondary users.The unused authorized bands can be accessed by secondary users effectively in a competitive manner.Monte Carlo simulation method is used for scheme evaluation.Simulation results show that compared with the traditional algorithm,the proposed protocol can efficiently improve spectrum utilization rate in authorized frequency bands and therefore improve system performance.