多径衰落信道中基于自适应MCMC的调制识别  

Modulation Recognition Using Adaptive MCMC in Multipath Fading Channel

作　　者：靳晓艳[1] 周希元[1,2] 张琬琳[3] 

机构地区：[1]西安电子科技大学ISN国家重点实验室,西安710071 [2]中国电子科技集团公司第五十四研究所,石家庄050081 [3]西安应用光学研究所,西安710071

出　　处：《北京邮电大学学报》2014年第1期31-34,共4页Journal of Beijing University of Posts and Telecommunications

摘　　要：针对多径衰落信道中幅相调制信号的类型识别问题,提出了一种基于自适应马尔可夫链蒙特卡洛(MCMC)——自适应Metropolis的改进算法.该算法利用Markov链的历史信息自动调整建议分布函数的协方差矩阵,使其不断地逼近目标分布,从而避免了传统Metropolis算法中建议分布函数选取这一难题,并能有效地提高采样效率.仿真实验表明,算法具有很好的识别精度,证明了算法的有效性.A new algorithm based on adaptive Metropolis algorithm for recognizing phase-amplitude- modulated signals in muhipath fading channel was proposed. The method uses the full history of the chain to tune eovariance of the proposal distribution adaptively. This adaptation strategy can approach an ap- proximation of the target distribution, which can avoid the problem of selecting proposal distribution in traditional Metropolis algorithm and improve the sampling efficiency effectively. Simulation show that the proposed method has high accuracy which verifies the validity of the algorithm.

关 键 词：调制识别 多径衰落 自适应Metropolis 马尔可夫链蒙特卡洛 

分 类 号：TN911.7[电子电信—通信与信息系统]