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摘要：无线电频谱是一种宝贵的资源，目前采用的是基于频谱授权的静态频带分配的原则。该原则常常导致某段时间内一些频段使用得非常频繁，从而造成了一部分频谱资源的浪费。认知无线电（cognitive radio, CR)技术正是基于这一问题提出的一种用于提高无线电通信频谱利用率的新的智能技术。本文着重阐述认知无线电的关键技术──频谱感知，详细地分析两种本地频谱感知的检测方法。为了验证其正确性，在MATLAB平台，对能量检测、匹配滤波器检测进行了建模仿真，比较分析了这两种方法的检测性能。本文还提出一种分布式有限合作检测机制，推导出基于“or”准则和“and”准则的有限合作机制的检测概率，并进行了MATLAB仿真。52042
毕业论文关键词：认知无线电,匹配滤波器检测,能量检测,协作频谱感知
Abstract: The radio spectrum is a valuable resource, is currently used in static frequency spectrum allocation based on the principle of authorization. The principle often leads to a certain period of time some band used very frequently, resulting in a part of the spectrum resource waste. Cognitive radio (cognitive radio, CR) technology is a new technology for improving the radio spectrum utilization made this problem based on. This paper focuses on the key technology of spectrum sensing in cognitive radio, a detailed analysis of two methods for the detection of local spectrum sensing. In order to verify its correctness, on the platform of MATLAB, the energy detection, matched filter detection are modeling and simulation, comparison and analysis of the detection performance of the two methods. This paper also presents a distributed detection scheme is derived based on the limited cooperation, "or" and "and" standard criteria limited cooperation mechanism of the probability of detection, and the MATLAB simulation.
Keywords: cognitive radio, energy detection, circulation translation perception, cooperative detection
目录
1 绪论 4
2 认知无线电技术 4
2.1 认知无线电的概念 4
2.2 认知无线电的特性与功能 4
3 认知无线电技术的核心——频谱感知技术 5
3.1 频谱感知技术背景及概念 5
3.2 单节点频谱感知技术 6
3.2.1 能量检测法 7
3.2.2 匹配滤波器检测法 8
3.3 多节点频谱检测技术 10
3.3.1 “或”准则 10
3.3.2 “与”准则 11
3.3.3 “K轶”法 12
4 实验仿真 13
4.1 实验仿真环境 13
4.3 匹配滤波器检测仿真与结果 14
3.4 合作式检测仿真与结果 15
总 结 18
参 考 文 献 19
致 谢 20
附录1 能量检测仿真实验代码 21
附录2 匹配滤波器仿真实验代码 22
附录3 合作式检测仿真实验代码