跳频OFDM通信系统同步算法及实现

结合跳频通信技术抗干扰和正交频分复用(OFDM)技术节省频带资源的优点,提出了一种通信帧格式及其同步算法。该算法构造了每个载波上传输隐藏伪随机序列的OFDM数据,利用伪随机序列良好相关特性实现了定时估计和粗频偏捕获,再使用ML估计算法进行细频偏估计,能够使OFDM技术应用到跳频通信领域。仿真和实验结果表明,在多径信道下,提出的算法单个定时估计和频偏估计误差小。

FH-OFDM Receiving Synchronization Algorithm and Implementation

Based on advantages of FH（frequence hopping） technology in anti-interference and of orthogonal frequency division multiplexing （OFDM） in frequency band resource saving, a frame format and its synchronization algorithm are proposed. This algorithm constructs a training symbol transmitted OFDM data superimposed with PN sequence on each carrier, the proposed algorithm, by using the perfect correlation of the symbol, accomplishes the timing estimation and the coarse frequency offset capture and by employing the ML estimation algorithm the fine frequency offset estimation in FH communication system. Simulation and experiment show that this new algorithm could result in smaller timing and frequency offset estimation error and lower calculation complexity in multipath fading channel.