【摘要】 正交频分复用(OFDM)凭借其强抗多径能力、高频谱利用率成为无线通信领域中的重要技术,但其对载波频率偏移的高度敏感限制了OFDM技术的发展,因此对于OFDM系统中的频偏估计与补偿技术的研究有着重大意义。文中给出了一种适用于突发通信的可变参数的易于硬件实现的系统数据帧格式,同时说明了帧格式的参数设计原则。介绍并推导了基于此数据帧结构的频偏估计与补偿算法。最后,将算法通过FPGA实现,在开发板中成功运行,通过在线逻辑分析仪证明了其有效性。与同类文献中的方法进行比较,证明此算法可以降低系统复杂度。更多还原

【Abstract】 Orthogonal frequency division multiplexing(OFDM) has been an important technology in various fields of communication, because of its strong anti-multipath effect ability and high frequency efficiency.However, the development of OFDM technology is constrained by its high sensitivity of frequency offset.It is significant to research the technology for estimation and compensation of frequency offset in OFDM system.A parameter variable system data frame format which is easy to hardware implemente in burst communication is given in the paper, and the design principle of the frame format is shown too.The frequency offset estimation and compensation algorithm based on the frame format is analyzed.The algorithm implemented by FPGA, and the program run successfully in the board.Finally, the correctness of system is determined by online logic analyzer.The system complexity is reduced by the simplified method in the paper compared with similar literatures.更多还原