一种数字调制信号的成形滤波滚降系数估计方法  

An Estimation Method for The Roll-off Factor of Shaping Fittering of Digital Modulation Signals

作　　者：杨尚飞 陆凤波 YANG Shang fei;LU Feng bo(National Navy Research Academy,Beij ing 100161,China)

机构地区：[1]海军研究院,北京100161

出　　处：《舰船电子对抗》2018年第4期76-79,82,共5页Shipboard Electronic Countermeasure

摘　　要：针对常用数字通信调制信号的成形滤波器的滚降系数估计,提出了一种基于接收信号功率谱估计和求解非线性方程的参数估计方法。由于接收信号的理想功率谱为升余弦函数傅里叶变换的幅度谱,首先对功率谱进行反快速傅里叶变换,然后对余弦项进行泰勒展开,最后通过解高次方程来估计滚降系数。通过不同参数条件下的仿真实验验证了所提出的参数估计方法的有效性。This paper proposes a parameter estimation method based on the power spectrum estima tion of received signal and parameter estimation method for resolving non linear equation aiming at the roll off factor estimation of shaping filter for common digital communication modulation sig nals. The ideal power spectrum of received signal is the amplitude spectrum of raised cosine function after fast Fourier transform （FFT）,so the power spectrum of received signal is changed by inverse fast Fourier transform （IFFT）,and then the cosine term is unfolded by Taylor, finally the roll off factor is estimated by solving high order equation.The efficiency of the proposed roll off factor estimation method is validated through the simulation experiment under different parameter condition.

关 键 词：参数估计 滚降系数 成形滤波 逆傅里叶变换 

分 类 号：TN911[电子电信—通信与信息系统]