电讯技术Issue(9)：1036-1041,6.DOI:10.3969/j.issn.1001-893x.2015.09.016
基于相关峰检测的π/4-DQPSK频差估计
π/4-DQPSK Frequency Offset Estimation Based on Correlation Peak Detection
摘要
Abstract
A frequency offset estimation algorithm based on correlation peak detection is presented to solve the low symbol-rateπ/4-DQPSK differential demodulation performance deterioration due to large frequen-cy offset. This algorithm correlatively detects the received signal using known M sequence and the frequen-cy offset is estimated based on the diffident effect on the correlation peak of inphase( I) channel and quad-rature( Q) channel. Theoretical derivation of the algorithm is given and its capability is simulated and com-pared with Kay estimation,Fitz estimation and L&R estimation. Results show that this algorithm has similar estimation range which is half of symbol rate,slightly poorer estimation precision whose mean-square error ( MSE) is superior than 2 ×10-4 with signal-to-noise ratio( SNR) greater than 0 dB ,but much less calcu-lating amount and implementation complexity. It is more valuable in practical engineering.关键词
跳频通信/π/4-DQPSK差分解调/频差估计/相关峰检测Key words
frequency hopping communication/π/4-DQPSK differential demodulation/frequency offset es-timation/correlation peak detection分类
信息技术与安全科学引用本文复制引用
魏鹏,陆锐敏,谢世珺..基于相关峰检测的π/4-DQPSK频差估计[J].电讯技术,2015,(9):1036-1041,6.基金项目
国家自然科学基金资助项目(61301158)Foundation Item:The National Natural Science Foundation of China(No.61301158) （61301158）
