Feedback-free method for the demodulation of higher-level MQAM s

Details Feedback-free method for the demodulation of higher-level MQAM s Feedback-free method for the demodulation of higher-level MQAM s

1997-08-26

1998-12-29

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

329306, 375264, 375324, 375329, H03D 300, H04L 2738

Patent

active

058545700

ABSTRACT:
For demodulation of higher-level MQAM signals without knowledge of the transmitted symbols, the clock phase error is calculated first after the sampling of the baseband signal with a clock frequency corresponding to the MQAM signal, and the corresponding time shift of the baseband signal is compensated therewith by interpolation (clock synchronization). Subsequently, the carrier frequency deviation and the carrier phase deviation are calculated feedback-free according to the principle of the maximum likelihood theory using Fourier transformation or by convolution in the time domain, and thus the data sequence is compensated.

REFERENCES:
patent: 5150383 (1992-09-01), Misaizu et al.
patent: 5594759 (1997-01-01), Iwamatsu
"A New Carrier Regeneration Scheme for QAM Signals," Hoffmann, IEEE International Symposium on Circuits and Systems, Finland, Jun. 1988, pp. 599-602.

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