一种基于FFT变换的超宽带信道盲估计算法

An algorithm for blind channel estimation in an ultra-wideband communication system based on FFT transform

提出一种假设同步条件下,适合PPM调制的超宽带信道盲估计算法.算法基于接收信号的一维圆周平稳特性,结合圆周退卷积运算,达到对参数的估计目的.该算法只需简单的傅里叶变换运算和少量操作,具有低复杂度,易工程实现的优点.算法可同时对多路信道进行估计,而且对幅度和相位不存在模糊因子.仿真结果表明,对于传输500个信息符号的信道估计结果,当系统误码率达到1‰时,与理想条件下接收机信噪比相差不到3 dB.

An ultra-wideband blind channel estimation algorithm suitable for PPM modulation is proposed under assumption of synchronization. The algorithm achieves parametric estimation on the basis of one-dimensional cyclostationarity with the aid of circular deconvolution. The algorithm uses simple Fourier transforms and very few operations, so it is not complex and is easy to use in engineering. The algorithm can perform estimations for multiple channels, and there is no ambiguity in both the amplitude and the phase of the estimated channel. Simulations show that the channel estimation result differs from the SNR under idealized condition by less than 3 dB when 500 information symbols are transmitted and the BER is 0.001.