Research On Carrier Recovery Technique In Digital Communication System

It is necessary in digital communication system that carrier recovery can compensate frequency offset and phase jitter brought by transmission and modulation. This paper is mainly focused on carrier recovery technique .We introduce the channel model at cable headed and receiving site. Firstly, we introduce the principle of carrier recovery and give some algorithms of them, which are directed-decision, reduced constellation and frequency sweeping. We give their simulation results, respectively. Furthermore, we research deeply an algorithm on high-order QAM with large frequency that is polarity decision. We detail its theory, performance and feature, then give examples and simulation results .Since the analysis and comparison of these algorithms are made by computer simulation. Finally, FPGA is designed for application in FPGAadvantage.