现代电子技术Issue(5)：35-38,4.
一种应用于无线传感网的频偏估计改进方法
An improved method of frequency offset estimation for wireless sensor networks
摘要
Abstract
M&M method is a typical frequency offset estimator,but its SNR threshold raises when frequency becomes larger, to solve this problem,an improved frequency offset estimator based on M&M method is proposed. Firstly the average treatment of the autocorrelation function is utilized to reduce the noise. Then frequency offset is roughly obtained by using average value, and the problem of phase ambiguity is solved. At last a more reasonable window function is derived and the final expression of estimation frequency offset is given. Simulation results show that the SNR threshold of the proposed method is at least-1 dB low-er than M&M method,and the SNR threshold can keep low when the frequency offset increases. The estimation range of the pro-posed method can reach 90% of the theory value in condition of keeping the SNR threshold -3.5 dB. Additionally,the estima-tion accuracy is better than M&M method when max autocorrelation order is small. The proposed method meets the requirements both in SNR threshold and estimation range in wireless sensor networks.关键词
频偏估计/信噪比门限/自相关函数/M&M算法Key words
frequency offset estimator/SNR threshold/autocorrelation function/M&M method分类
信息技术与安全科学引用本文复制引用
周磊磊,朱磊基,汪明亮..一种应用于无线传感网的频偏估计改进方法[J].现代电子技术,2014,(5):35-38,4.基金项目
国家重大专项资助项目（2010ZX03006-003）；国家973计划资助项目 （）
