计算机工程 ›› 2019, Vol. 45 ›› Issue (11): 102-106.doi: 10.19678/j.issn.1000-3428.0053177

• 移动互联与通信技术 • 上一篇    下一篇

适用于便携式无线视频通信的OFDM同步算法

赵柏山, 刘勇强   

  1. 沈阳工业大学 信息科学与工程学院, 沈阳 110023
  • 收稿日期:2018-11-19 修回日期:2018-12-27 发布日期:2019-01-04
  • 作者简介:赵柏山(1980-),男,副教授、博士,主研方向为通信信号处理;刘勇强,硕士研究生。
  • 基金项目:
    辽宁省自然科学基金(20180520022)。

OFDM Synchronization Algorithm Suitable for Portable Wireless Video Communication

ZHAO Baishan, LIU Yongqiang   

  1. College of Information Science and Engineering, Shenyang University of Technology, Shenyang 110023, China
  • Received:2018-11-19 Revised:2018-12-27 Published:2019-01-04

摘要: 针对便携式无线视频通信在多径衰落信道下的符号同步问题,结合符号序列的延迟相关性与共轭对称性,提出一种改进的正交频分复用(OFDM)同步算法。该算法采用Schmidl&Cox算法确定符号同步范围,利用Park算法进行前向搜索,将首次大于门限阈值的点作为符号同步点。仿真结果表明,当信噪比大于3 dB时,该算法在6径典型城市信道下能够实现准确的OFDM符号同步,载波频偏估计均方误差小于0.000 4,适用于便携式无线视频通信系统。

关键词: 前向搜索, 固定门限, 符号同步, 频偏估计, 便携式无线通信

Abstract: To address the symbol synchronization problem of portable wireless video communication under multipath fading channels,this paper proposes an improved Orthogonal Frequency Division Multiplexing(OFDM) synchronization algorithm based on the lagged correlation and conjugate symmetry of symbol sequences.The algorithm uses the Schmidl & Cox algorithm to determine the synchronization scope of symbols,and uses the Park algorithm for forward search with the first point exceeding the threshold as the symbol synchronization point.Simulation results show that when the Signal Noise Ratio(SNR) is higher than 3 dB,the algorithm can implement accurate OFDM symbol synchronization under 6-route typical urban channels with a mean square error of frequency offset estimation for carrier wave smaller than 0.000 4.It is applicable to portable wireless video communication system.

Key words: forward search, fixed threshold, symbol synchronization, frequency offset estimation, portable wirelesscommunication

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