数据采集与处理2018，Vol.33Issue(1)：58-64,7.DOI:10.16337/j.1004-9037.2018.01.007
一种适应于IEEE 802.15.4k标准的高精度频偏估计算法
High-Accuracy Frequency Offset Estimation Algorithm Based on IEEE 802.15.4k
摘要
Abstract
In order to implement the frequency offset estimation in direct sequency spread spectrum (DSSS)system based on the standard of IEEE 802.15.4k under low SNR circumstance,an improved frequency offset estimation algorithm with high accuracy and stability is proposed in this paper.The pro-posed algorithm firstly makes biased auto-correlation and iteration to the signals by using the phase and amplitude information at the same time under the premise of ensuring the frequency offset estimation range,which improves the SNR of sequences including the phase information.And then it calculates the phase angles for each order difference of biased auto-correlation signals and makes a weighted mean, which overcomes the difficulty in meeting approximate conditions for Fitz method under low SNR circum-stance.The simulation results show that the proposed method can achieve high accuracy estimation with-out reducing the estimation range under extremely low SNR circumstance,and the estimation precision meets the tolerance to residual frequency offset for the receiving system under the standard of IEEE 802. 15.4k.关键词
直接序列扩频/低信噪比/频偏估计/有偏自相关/IEEE802.15.4kKey words
direct sequency spread spectrum(DSSS)/low SNR/frequency offset estimation/biased au-to-correla/IEEE 802.15.4k分类
信息技术与安全科学引用本文复制引用
叶晓青,罗炬锋,邱云周,朱元萍,黄河笑..一种适应于IEEE 802.15.4k标准的高精度频偏估计算法[J].数据采集与处理,2018,33(1):58-64,7.基金项目
上海市科技基金(15DZ1100400)重大资助项目 （15DZ1100400）
国家自然科学基金(61471347)资助项目. （61471347）
