定时同步与匹配滤波频域联合实现技术

为减少高速卫星通信系统运算量，提出了一种免混频的定时同步与匹配滤波联合的架构。该架构通过对滤波模块和同步模块的改进，将滤波器运算结果复用到定时同步模块中去，实现了使用一次快速傅里叶变换便完成信号的滤波和同步处理。不仅降低了系统复杂度，而且减少了运算量。理论分析和仿真实验表明，该结构在低信噪比和大时延环境下具有较好的估计性能，并且该结构通过模块间资源的复用，有效的降低了系统运算量，和Gardner算法相比，本文使用的方案可以减少大约70%的运算量，适用于高速解调系统。 

A Joint Implementation for Timing synchronization and matching filtering through the frequency domain

In order to reduce the computational complexity of the high-speed satellite communication system, the article proposed an architecture that combined the timing synchronization and the matching filtering without mixing. In the architecture, the filter module and the synchronization module were improved to ensure that the filter operation results could be used in the timing synchronization module. In other words, the architecture could complete signal filtering and synchronization processing through a Fast Fourier Transform. So this method could not only reduce system complexity but also reduce the amount of computation. Theoretical analysis and simulation experiments show that the architecture has better estimation performance at low signal to noise ratio and high latency environment. At the same time, this architecture effectively reduces the amount of system calculations by reusing resources between modules. Compared with the Gardner algorithm, the scheme used in this paper can reduce about 70% of the calculation, which is suitable for high-speed demodulation system.