Automatic gain control 16-ary quadrature amplitude...

Details Automatic gain control 16-ary quadrature amplitude... Automatic gain control 16-ary quadrature amplitude...

2005-06-14

2008-11-11

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Receivers

Automatic gain control

C341S079000, C341S079000, C341S079000, C341S079000, C455S063300, C455S114100, C455S136000, C455S138000

Reexamination Certificate

active

07450670

ABSTRACT:
An improved AGC subsystem for preferred use in quadrature amplitude modulation receivers offers improved automatic gain control of received signals in fading channels by generating an error signal only from constellation signal points having large signal-to-noise ratios for increase the signal-to-noise ratio of the gain control error signal for lowering dispersion of symbol signals in the constellation signal space for improving data detection of symbol signals with the improved performance with as much as one dB in the signal-to-noise ratio.

REFERENCES:
patent: 4835483 (1989-05-01), Matsuura
patent: 5636252 (1997-06-01), Patel et al.
patent: 7120208 (2006-10-01), Nayler

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