卫星移动通信信号处理同步技术研究

Research on synchronous technology of satellite mobile communication signal processing

摘要:

卫星移动通信信号处理同步技术很大程度上决定了通信的质量。针对卫星移动通信系统中突发信号符号长度短、独特码少的特点,对传统的基于最大似然准则线性相位内插相位估计算法和二次插值快速傅立叶变换频偏估计算法进行了研究,进行了线性相位内插算法和二次插值快速傅立叶变换频偏估计算法机理分析；根据噪声平均化原则,提出了一种低导频段数据情况下改进的线性相位内插算法；利用数据段信息和导频段信息整体做频偏估计的方法,提高了导频段个数较少情况下的频偏估计精度；仿真与试验结果表明：改进的线性相位内插算法比传统算法相位同步性能更高,利用整帧数据做频偏估计精度更高,并满足卫星移动通信终端信号处理的要求。

Abstract:

Satellite mobile communication signal processing synchronization technology largely determines the quality of communication. For the feature of short burst signal and less unique word in the satellite mobile communication system, this paper studies the traditional linear phase interpolation algorithm based on maximum likelihood criterion and quadratic interpolation FFT frequency deviation estimation algorithm. And this paper analyzes the mechanism of linear phase interpolation algorithm and FFT frequency deviation estimation algorithm. According to the principle of noise averaging, this paper presents an improved linear phase interpolation algorithm in low pilot frequency data. Using the data segment information and the channel information to estimate the frequency deviation, this paper improves the accuracy of frequency deviation estimation in less conduction band.Simulation and test results show that: the improved linear phase interpolation algorithm is better than the traditional algorithm, the accuracy of frequency deviation estimation is higher and meet the signal processing requirements of satellite mobile communication terminals.