Abstract: 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.