均方误差短时反馈算法的残余频偏纠正及阈值选取的研究

Research of Residual Frequency Offset Correction Based on the Mean Square Error Short-Term Feedback Algorithm and Decision of the Threshold

介绍了一种在全数字接收机中基于最小均方误差的残余频偏矫正算法,目的是改善由于残余频偏累积引起的误码率的加剧,以及通过利用最小均方误差判定准则确定判决门限值的大小。此种算法通过均方误差准则探测分析有无残余频偏,再利用短时反馈算法进行残余频偏的矫正。重点介绍了残余频偏矫正的算法和判决门限值的选取。矫正后误码率明显下降,码元质量得到有效改善。

A residual frequency offset correction algorithm based on the minimum mean square error in all-digital receiver is introduces,which aims to decline the cumulative error rate caused by the residual frequency offset,and to determine the size of decision threshold through the use of minimum mean square error criterion.This algorithm detects whether there is residual frequency offset by use of mean-square error criteria,then corrects the residual frequency offset by the criteria of short-time feedback algorithm. It focuses onthe residual frequency offset correction algorithm and the selection of decision threshold. The BER decrea- ses obviously after the correction.