计算机工程与应用2018，Vol.54Issue(5)：96-100,5.DOI:10.3778/j.issn.1002-8331.1610-0211
基于软判决反馈的猝发通信同步算法
Frame synchronization and symbol timing synchronization based on soft decision feedback in burst communication
摘要
Abstract
To tackle the issues of frame synchronization and symbol timing synchronization in wireless burst communication system,a novel synchronization method based on soft decision feedback in fading channel is proposed.Firstly,this paper samples time-based sliding windows to obtain the received sequence of the preamble and data symbols,so the signal-to-noise ratio and fading are estimated on the received preamble sequence.Then a new likelihood function is proposed by using the soft decisions on the unknown PSK or QAM data symbols,and the new likelihood value is calculated by the received signal.Frame synchronization completed when the likelihood value exceeds the synchronization threshold.Finally, after a peak seeking to the likelihood function, a fine synchronization is implemented using the Gaussian interpolation. When conducted on the frame of 80 symbols within 16 symbols preamble,the simulation results demonstrate that,for unknown PSK symbols, the proposed method outperforms the Cramer-Rao Bound(CRB(16))with the length of 16 known symbols at low SNR and approaches CRB(80)at high SNR.For unknown QAM symbols,the proposed method outperforms CRB(16)at both low SNR and high SNR.关键词
衰落信道/同步头辅助/对数似然函数/软判决/高斯插值Key words
fading channel/preamble-aided/log-likelihood function/soft decision/Gaussion interpolation分类
信息技术与安全科学引用本文复制引用
游行远,杨平,彭军伟..基于软判决反馈的猝发通信同步算法[J].计算机工程与应用,2018,54(5):96-100,5.基金项目
国家部委科技预研基金项目. （）
