Decision-directed Joint Tracking Loop for Carrier Phase and Symbol Timing in QAM. Project 2 ECE283 Fall 2004. Outline. System concept QAM signal source and receiver Decision-directed PLL Characterization Tools Submission. System Concept (1). Simplified 64-QAM communications system.
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64-QAM demodulated with
perfect phase and 2.5% phase lag
QAM receiver system
QAM communication system
Decision-directed PLL system diagram
Phase locking performance with a random QAM waveform
Phase locking with 10% deviated frequency signal