信息与控制2011，Vol.40Issue(4)：472-476,5.DOI:10.3724/SP.J.1219.2011.00472
基于ZigBee的LS频偏估计改进算法
A Modified Algorithm of LS Frequency Offset Estimation Based on ZigBee
摘要
Abstract
For multi-path interference characteristics of wireless channel, the data-aided frequency offset estimation algorithm is improved based on the least squares (LS) error criterion. And a modified algorithm is proposed according to the correlation of the training sequence or the preamble symbols. The simulation results under specifications of ZigBee show that the mean square error (MSE) of the modified algorithm is better than that of the BAF (best angular fit) algorithm. When SNR is greater than 9 dB, the accuracy of frequency offset estimation of the algorithm comes up to the accuracy of the combination algorithm of coarse frequency estimation and fine frequency estimation. At the same time, the MSE of the proposed algorithm is close to Cramer-Rao low boundary (CRLB). Therefore, the algorithm can meet communication requirements for automatic meter reading system based on Zigbee technology in the metropolitan wireless channel environment.关键词
频偏估计/多径干扰/无线传感网络/克拉美—劳下界Key words
frequency offset estimation/ multi-path interference/ wireless sensor network/ Cramer-Rao low boundary分类
信息技术与安全科学引用本文复制引用
刘述钢,刘宏立,王彦..基于ZigBee的LS频偏估计改进算法[J].信息与控制,2011,40(4):472-476,5.基金项目
国家863计划资助项目(2007AA11A121) （2007AA11A121）
湖南省科技厅计划资助项目(2008FJ3114). （2008FJ3114）
