Architecture Consideration and Performance Analysis of High Speed- Adaptively Coherent Demodulator for Multi-State QAM Transmission

An advanced architecture of high speed multi-state coherent demodulator with joint estimation and equalization arrier recovery is introduced, the demodulator included the adaptive phase jitter equalizer and a series adaptive controls for reducing the degradation in the environment of severe multipath fading. The performance analysis of this paper for the demodulator can cover the effects due to Gaussian noise, multipath fading, and various equipment degradations, as well as interferers. Some analysis/simulation and measured results have also been given for showing the advantages of the demodulator.