一种MASK信号码元速率估计方法  

Symbol Rate Estimation of MASK Modulated Signals

作　　者：汪伟[1] 张效义[1] 滕晓云[2] 胡赟鹏[1] 

机构地区：[1]信息工程大学,河南郑州450001 [2]中国卫星海上测控部,江苏江阴214430

出　　处：《信息工程大学学报》2015年第1期35-40,共6页Journal of Information Engineering University

基　　金：国家科技重大专项资助项目(2010ZX03006-002)

摘　　要：针对低信噪比时MASK信号码元速率估计性能较差的问题,提出了基于平方定时的改进方法,提高了低信噪比下MASK信号码元速率估计性能。基于平方定时的原理,对信号取模平方后,计算不同采样倍数对应的傅立叶系数模值,得到包含信号码元速率信息的变换谱,通过计算每点向左的峰均比来搜索代表码元速率的特征谱线,由特征谱线位置得到码元速率估计值。文章分析了滚降系数的影响,并且针对信号载波提出了解决办法。仿真结果表明,改进的方法在低信噪比和低滚降系数时,码元速率估计性能优于原方法、小波变换方法和循环平稳方法。An improved method based on the timing square is proposed and the symbol rate estimation performance of MASK modulated signals in low-SNR environment is improved in order to upgrade the poor performance of the symbol rate estimation of MASK modulated signals when SNR is low. Based on the principle of the timing square,the signal module is squared to calculate the Fourier coefficient modulus corresponding to the different sampling ratio,and the transform spectrum which contains symbol rate information is achieved. Peak-to-average ratios to the left of each point are calculated to search the characteristic line representing the symbol rate,and the estimation of the symbol rate can be obtained by the position of the characteristic line. The impact of the roll-off factor is analyzed,and the solution of the signal carrier wave is proposed in this paper. Simulation results show that the performance of symbol rate estimation of the improved method is better than the original method,the wavelet transform method,and the cyclostationary method in low SNR and low rolloff factor environment.

关 键 词：码元速率估计 平方定时 滚降系数 载波 

分 类 号：TN911[电子电信—通信与信息系统]