The algorithm of rapid signal capture and synchronization recognition in wireless communication and its implementation

In the high-speed wireless communication, by the frequency difference impact, it took longer time to capture the carrier and to establish the symbol synchronization within the demodulation. Given the characteristics of pi/4 -DQPSK modulation and frequency-hopping communication, which were widely used in the wireless communication, the algorithm of the rapid signal capture and synchronization recognition were established depending on the pi/4 -DQPSK. Thus, this algorithm combined with the signal energy detection and the frequency capture which were in the parallel processing, by taking advantages of the FPGA technology, as a result, achieving the rapid capture of the carrier and the synchronization recognition in the wireless communication. Finally, the experiments were made, by applying the established models to the rapid signal capture and synchronization recognition. The results show the stable recovery of the clock synchronization signal in the eight symbol time.