VDES中频偏估计与相位跟踪算法研究  

Research on frequency offset estimation and phase tracking algorithm in VDES

作　　者：范家辉 王建新[1] Fan Jiahui;Wang Jianxin(School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学电子工程与光电技术学院,南京210094

出　　处：《电子测量技术》2020年第23期51-56,共6页Electronic Measurement Technology

摘　　要：针对甚高频数据交换系统(VDES)中的16QAM调制信号的频偏估计问题,在M&M算法基础上,结合滑动窗口去相偏的算法思想,并利用信号帧结构中Reed Muller码的良好的纠错能力,提出了一种两步M&M频偏估计与相位跟踪算法,先做范围较大的粗频偏估计,再做精度较高的细频偏估计,最后保持相位跟踪状态。仿真结果在工作条件Eb/N0=4 dB左右,性能损失小于1 dB。研究结果表明,该算法能够提高低信噪比下的估计精度,提高解调系统的误码性能。Based on the M&M algorithm, combining with the algorithm idea of phase offset elimination using sliding window, and utilizing the good error correction capability of the Reed Muller code in the frame structure of the signal, a two-step M&M frequency offset estimation and phase tracking algorithm is proposed for the frequency offset estimation of 16 QAM modulated signal in VHF data exchange system(VDES). First make a rough frequency offset estimation with a larger range, then make an accurate frequency offset estimation with higher accuracy, and finally keep the phase tracking state. The simulation results show that the performance loss is less than 1 dB when the working condition is about Eb/N0=4 dB. The research results show that the algorithm can improve the estimation accuracy under low signal-to-noise ratio and the bit error rate performance of the demodulation system.

关 键 词：VDES 16QAM 频偏估计 M&M算法 Reed Muller码 

分 类 号：TP911[自动化与计算机技术]