A Low Complexity Frequency-Domain Parallel Demodulation Structure Combined with Symbol Synchronization

A frequency-domain parallel demodulation structure combined with symbol synchronization is proposed by analyzing traditional demodulation structure based on FFT. The structure not only decreases the output data rate of filter to symbol rate but also shortens FFT length, thus the implementation complexity is reduced obviously. In addition, a frequency-domain symbol synchronization algorithm for the improved structure is proposed by illustrating its computational process and implementation architecture. The capture and tracking performance of the algorithm are simulated. The simulation results show that the structure has low implementation complexity and good performance in low signal-to-noise ratio (SNR) environment so that it can meet the practical application requirements in highspeed satellite communication system.