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认知无线电能够智能地感知频谱并在授权用户没有使用的时候“伺机”(opportunistic)利用其频段,从而提高频谱的利用率。频谱检测是认知无线电系统需要首先解决的问题。协同检测可以更有效地利用整个网络的资源,获得高的分集增益,使网络性能更稳定。文中简述了协同检测的基本原理,并对协同频谱检测技术进行了讨论。仿真结果表明协同可以提高检测概率、提供捷变增益(agility gain),对频谱利用率的提高有很大的贡献。
Cognitive radios intelligently sense the spectrum and “opportunistically” exploit its frequency band when unauthorized users are not using it, resulting in increased spectrum utilization. Spectrum detection is a problem that cognitive radio systems need to solve first. Collaborative detection can make more efficient use of the entire network resources, access to high diversity gain, the network performance more stable. The article briefly describes the basic principles of collaborative detection, and discusses the collaborative spectrum detection technology. The simulation results show that synergy can improve the detection probability, provide agility gain and greatly contribute to the improvement of spectrum utilization.