OFDM数字调幅广播时频同步问题的研究

Study on the problem of Time-frequency synchronization of Digital Amplitude Modulation Radio of OFDM

从OFDM系统模型入手,介绍OFDM系统信号波形特点,分析同步错误对OFDM信号的影响,简要介绍时频同步算法的优缺点,重点介绍联合估计定时和频偏的时频定时同步算法,它可以完成对采样定时和符号的同步,实现简单,准确度高,在信噪比低的情况下也能正常工作,也适用于无线多径瑞利衰落环境下的OFDM符号同步方法。

This paper starts from OFDM system model and introduces the feature of waveform of the OFDM system signal.Analysis is the made on several points：the affection of synchronization signal error on OFDM signal,the advantages and disadvantages of time-frequency synchronization method,and,the combined estimate time and frequency bias of time-frequency synchronization method.The algorithm can help realize the synchronization of timing sample and symbol,with easy performance and high fidelity.It also applies to the case of wireless muhipath Rayleigh fading channel of OFDM transmission for synchronization.