摘要
针对低信噪比环境下二相编码(BPSK)信号参数估计的问题,该文提出一种基于功率谱FFT的信号参数估计算法。该算法根据信号功率谱傅里叶变换得到的幅度谱和相位谱与各参数之间的关系,实现BPSK信号的码元宽度、载频和码长估计。该算法对功率谱继续做傅里叶变换可以进一步消除噪声对估值的影响,更适合在低信噪比环境下实现参数的估计,且计算简单易于实现。仿真试验证明了该算法的准确性和抗噪性,在信噪比为-10 dB时BPSK信号的载频和码元宽度估计正确率分别比循环谱算法提高了9.9%和190.9%。
A parameters estimation algorithm based on the power spectral FFT is proposed to estimate the parameters of Binary Phase Shift Keying（BPSK） signals under negative Signal-to-Noise Ratio（SNR） environment.The code width,carrier frequency and code length of BPSK signals are estimated according to the relationship between the parameters and the amplitude and phase spectrums,which are obtained through the FFT of power spectrum.This algorithm can further eliminate the noise based on power spectral FFT,so it is more suitable for low SNR environment.And the algorithm is computationally efficient and easy to realize.The experimental results demonstrate high accuracy and stronger capability on anti-noise,the estimation of the carrier frequency and the code width can increase by 9.9% and 190.9% with the cyclic spectral estimation algorithms.
出处
《电子与信息学报》
EI
CSCD
北大核心
2013年第5期1252-1256,共5页
Journal of Electronics & Information Technology
基金
天津市科技创新专项资金(10FDZDGX00400)资助课题
关键词
二相编码(BPSK)
参数估计
抗噪性
Binary Phase Shift Keying（BPSK）
Parameter estimation
Anti-noise capability
