基于检测门限优化的DVB-T信号联合检测算法  

Joint Detection Algorithm of DVB- T Signal Based on Optimized Threshold

作　　者：濮锦胜 刘彩丽[1] 肖海林[1] 李民政[1] 

机构地区：[1]桂林电子科技大学宽带与智能信息处理重点实验室,广西桂林541004

出　　处：《电视技术》2014年第11期140-142,146,共4页Video Engineering

基　　金：国家"973"计划基金资助项目(2008CB317109);国家自然科学基金项目(61261018;61362007);广西自然科学基金重点项目(2011GXNSFD018028);广西无线宽带通信与信号处理重点实验室2012年度主任基金项目(12111)

摘　　要：针对检测过程中认知信号检测门限难以合理设定以及检测准确率不高的问题,根据数字电视地面广播(DVB-T)信号循环前缀特征,给出一种联合能量检测与循环前缀相关检测算法。该算法将虚警概率与检测概率的加权作为门限的函数,通过最小化函数获得优化检测门限,最终达到提高系统检测性能的目的。仿真结果也表明,在信噪比为-25^-10 dB时,对比传统能量检测算法,采用优化判决门限的能量检测算法,检测概率提高了10%~22%,联合检测算法的检测准确率提高了2%~25%。To set a reasonable detection threshold and improve detection accuracy, a joint energy and correlation detection spectrum sensing algorithm is proposed, where the features of DVB - T signal cyclic prefix is utilized. In the algorithm, the false alarm probability and weighted detection probability are taken as the threshold function, and the optimized detection threshold can be obtained to improve system detection performance. The simulation re- sults also show, when SNR is -25 - -10 dB, the detection probability of the system will be increased 10% -22% by optimized threshold energy de- tection algorithm than the conventional energy detection algorithm. Moreover, the detection accuracy of the proposed algorithm is also improved 2% - 25%.

关 键 词：认知无线电 频谱感知 能量检测 循环前缀相关检测 

分 类 号：TN929.5[电子电信—通信与信息系统]