Multi-channel Parallel Sampling Algorithm in QAM Demodulation

This paper studies multi-channel parallel sampling algorithm which is used in the analog-digital conversion system (ADC) the QAM demodulation architecture with, ensuring data integrity and accuracy of sampling. The algorithm uses a number of low-speed ADC intertwined, time turns on the QAM signal is sampled by low-speed cross-uniform sampling sequences, shift, merge and get high-speed uniform periodic sampling sequences. At the same time that the algorithm can improve the speed and accuracy of data collection, as well the overall performance of demodulation system. Experimental results show that the constellation minimum phase shift, rotation range and other indicators have been improved significantly.