| 摘要: |
| 认知车载网中不同的衰落传播信道会影响频谱感知的性能。为了描述不同信道下的频谱感知性能，分析了加性高斯白噪声信道、瑞利衰落信道和Nakagami-m衰落信道条件下的频谱感知单用户能量检测概率和协作能量检测概率，重点是Nakagami-m衰落信道、检测衰落因子、次用户的数量和信噪比这几个参数对协作频谱感知性能的影响。仿真结果表明，通过对不同信道特性的准确了解能够帮助车辆在不同衰落信道环境下提高频谱的检测概率。 |
| 关键词: 车载自组织网络 认知无线电 瑞利衰落信道 Nakagami-m衰落信道 频谱感知 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（61371113,61401241）;交通运输部应用基础研究基金资助项目（2013-319-825-110） |
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| Performance analysis of spectrum sensing in cognitive vehicular networks |
| CHENG Feng,ZHANG Guoan,JIN Xilong |
| () |
| Abstract: |
| Different fading propagation channels in cognitive vehicular network affect the performance of spectrum sensing. In order to illustrate a general description of performance of spectrum sensing under different fading channels,detection probabilities of single-user energy and cooperative energy are analyzed under the conditions of additive white Gaussian noise(AWGN) channel and Rayleigh fading channel as well as Nakagami-m fading channel,with emphasis on the influence of such parameters as fading factor,number of secondary vehicles and signal-to-noise ratio(SNR) concerning the Nakagami-m fading channel on the performance of cooperative spectrum.Simulated results show that the accurate understanding of different channel characteristics can be helpful to improve the detection probability of spectrum between vehicles under different fading channel environment. |
| Key words: vehicular ad hoc network（VANET） cognitive radio Rayleigh fading channel Nakagami-m fading channel spectrum sensing |
