论文部分内容阅读
随着卫星通信业务的发展,卫星高阶调制技术逐渐得到广泛的应用,然而高阶调制信号受载波频差的影响比较严重。基于高阶幅度相位调制(APSK)的信号特点,讨论了载波频偏对信号产生的影响,并根据频偏带来的相位偏差的周期性,采用了周期统计和快速傅里叶变换算法,从而获得噪声下的频偏估计值,并进行了仿真和性能分析。研究和仿真表明,该方法估计精度较高,简单易行,且不受载波初始相偏的影响。
With the development of satellite communication services, satellite high-order modulation technology has been gradually widely used, however, high-order modulated signals are more seriously affected by carrier frequency offset. Based on the signal characteristics of high-order amplitude phase modulation (APSK), the effect of carrier frequency offset on signal generation is discussed. Based on the periodicity of phase deviation caused by frequency offset, period statistics and Fast Fourier Transform Obtains the frequency deviation estimated value under the noise, and has carried on the simulation and the performance analysis. The research and simulation results show that the proposed method has high estimation accuracy and is simple and not affected by the initial phase shift of the carrier.