中南大学学报（自然科学版）2016，Vol.47Issue(6)：1959-1966,8.DOI:10.11817/j.issn.1672-7207.2016.06.019
基于分集接收的卫星认知通信动态频谱感知策略
A dynamic spectrum sensing strategy based on diversity reception for satellite cognitive communication
摘要
Abstract
The efficiency of fixed decision threshold based spectrum sensing was deteriorated because of its inadequate adaptability to channel fading variations. A novel dynamic spectrum sensing strategy based on diversity reception in Nakagami-m channel fading was proposed for satellite cognitive communication, which takes the character as low energy of signals to be detected in satellite network into consideration. The optimized spectrum decision threshold adjusted dynamically according to the channel fading state using an advanced fuzzy C-Means clustering algorithm, and a signal receive scheme based on MRC (maximum ratio combining) and EGC (equal grain combining) diversity reception technology was designed to enhance the receiving SNR (signal to noise ratio) in order to mitigate the influence of weak signal environment on spectrum sensing. The results indicate that the performance of spectrum sensing is improved remarkably especially in low SNR environment by the proposed dynamic spectrum sensing strategy.关键词
卫星网络/认知无线电/频谱感知/分集接收/动态判决门限Key words
satellite network/cognitive radio/spectrum sensing/diversity reception/dynamic decision threshold分类
信息技术与安全科学引用本文复制引用
肖楠,梁俊,张衡阳,刘玉磊,王轶..基于分集接收的卫星认知通信动态频谱感知策略[J].中南大学学报（自然科学版）,2016,47(6):1959-1966,8.基金项目
国家自然科学基金资助项目(61501496)(Project(61501496) supported by the National Natural Science Foundation of China) （61501496）
