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认知无线电技术接入灵活,能够大大提高频谱的利用率,被认为是当前解决频带使用拥挤的最佳方案。认知无线电是一种可以感知周围通信环境来改变发射机在特定的参数上实时改变的智能通信系统。它采用动态频谱管理来提高频谱利用率,高可靠性的频谱感知是实现频谱共享的关键技术,对频谱感知技术的匹配滤波器检测、能量检测、静态循环特征检测和合作检测等进行了讨论,并分析了各种方法的特点和性能。
Cognitive radio technology access flexibility, can greatly improve the utilization of the spectrum, is considered to be the best solution to the current band to use congested. Cognitive radio is an intelligent communication system that can sense the surrounding communication environment and change the transmitter’s real-time changes in specific parameters. It uses dynamic spectrum management to improve the spectrum utilization. Highly reliable spectrum sensing is the key technology to realize spectrum sharing. The paper discusses the matched filter detection, energy detection, static cyclic detection and cooperative detection of spectrum sensing technology, And analyzed the characteristics and performance of various methods.