Synchronization Technology of OFDM Burst Communication for High-Speed Moving Platforms
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Beijing Institute of Remote Sensing Equipment， Beijing 100854， China
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摘要:
针对高速动平台短时突发通信的应用场景下，短帧结构的正交频分复用（Orthogonal frequency division multiplexing， OFDM）系统中训练序列和导频的数量受限，单一同步算法难以同时满足大范围和高精度的符号定时同步和载波相位同步问题。本文提出了一种改进的OFDM通信系统时间、频率快速同步算法，该算法借助短训练序列与导频信息，以粗定时捕获同步，粗频偏估计/校正，精频偏估计/校正，精定时估计/校正的同步流程，实现了大范围和高精度的符号定时同步和载波相位同步。经过仿真校验，该算法能够有效提高高速动平台短时突发通信的OFDM同步精度。
Abstract:
In the short-time and burst communication for moving platforms， the number of training sequences and pilots is limited in the orthogonal frequency division multiplexing （OFDM） system because the structure of frames is short. And it is hard for a single algorithm to meet the requirements of the large range and high precision of symbol and carrier synchronization. This paper proposes an improved symbol and carrier synchronization algorithm for the OFDM system with the help of the short training sequence and pilot information. The algorithm implements the large range carrier synchronization and the high precision symbol synchronization through the process of coarse symbol synchronization， coarse frequency synchronization， fine frequency synchronization and fine symbol synchronization. Simulation results show that the algorithm can effectively improve the OFDM synchronization accuracy of the short-time and burst communication for moving platforms.