一种基于PN训练序列的OFDM时频同步算法

一种基于PN训练序列的OFDM时频同步算法 A Novel Timing and Frequency Synchronization Algorithm Based on PN Training Sequence for OFDM Systems 朱秋萍 ZHU Qiuping 1 2 first-author 朱亮 ZHU Liang 1 2 戴加良 DAI Jialiang 1 2 武汉大学电子信息学院 武汉大学电子信息学院 School of Electronics Information, Wuhan University School of Electronics Information, Wuhan University 武汉大学电子信息学院,湖北,武汉,430072 武汉大学电子信息学院,湖北,武汉,430072 提出了一种基于PN训练序列的OFDM时频同步的新算法.该算法通过构造一种倒序结构的同步训练序列,获得了较好的定时性能;同时利用该序列实现了较精确的频率同步.仿真结果表明,在信噪比为20dB时,高斯信道条件下的频偏估计方差可达10-7,多径信道下可达10-5,频偏估计范围可以达到整个信号带宽的一半.与传统算法相比,该算法符号定时更精确,频率同步性更好,具有较好的可行性和实用性. A novel symbol timing and frequency synchronization algorithm for orthogonal frequency division multiplexing （OFDM） by using PN sequence is proposed in this paper. This algorithm constructs a special training sequence to gain a better symbol timing performance, and meanwhile implements accurate frequency offset estimation by using this sequence. Simulation results show the frequency off estimation mean-square error reaches 10-7 in additive white Gaussian noise channel and 10-5 in multi-path channel when signal to noise ratio is 20 dB. Its frequency off estimation range can be half of the bandwidth of signal, and compared with the conventional schemes, it not only has a better performance in frequency synchronization, but also is more accurate in symbol timing. 正交频分复用 定时同步 训练序列 频偏 orthogonal frequency division multiplexing （OFDM） timing synchronization training sequence frequency offset TN919.3 国家自然科学基金重点项目（90307017） 2008-01-01 2021-04-01 1