认知无线电MAC层感知结盟方案及实现

认知无线电是一种新兴的智能无线系统,它能够感知授权频段的使用情况,当授权用户不存在时接入通信,当授权用户出现时从该频段退避,以缓解日益紧张的频谱资源使用。文中主要研究认知无线电基于硬件平台的MAC层感知结盟方案及其实现。首先介绍文中所用的认知无线电感知结盟的场景,对结盟情况进行了仿真,验证了结盟相对于一般的协作能够提高系统性能并减少信道开销。在此基础上提出了MAC层基站与终端的方案与时隙划分、广播帧的机制,最后将该方案应用于实际硬件平台,显示出其检测的准确性及汇报的实时性。

The Implementation Method of Sensing Union in MAC in Cognitive Radio System

Cognitive radio(CR) is a novel intelligent wireless communication system that can sense the usage of licensed frequency in order to ease the tension of spectrum resources.When primary user(PU) is absent,a dynamic spectrum access is done by the cognitive user.While PU is present,the cognitive user retreats from the spectrum.This paper mainly focused on developing and realizing the sensing union module in MAC layer in cognitive radio system.The sensing union in CR network is first introduced.Then the simulation is done to prove our method is better than other cooperative schemes in terms of improving ROC performance and reducing channel overhead.And then we introduce the scenario of base station and cognitive users,as well as timeslot division and broadcast frame schemes.Lastly,detailed design and implementation in CR hardware platform with higher accuracy and real-time informing are specified.