Communication device with synchronized zero-crossing demodulator

Details Communication device with synchronized zero-crossing demodulator Communication device with synchronized zero-crossing demodulator

1995-08-03

1997-05-27

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Angle modulation

375336, 375355, H04L 2716

Patent

active

056338953

ABSTRACT:
A communication device with a synchronized zero-crossing demodulator is described. A synchronizer system (123, 223, 125, 227) and method derives symbol transition timing information from a zero-crossing detector output. The synchronizer (123, 223) is, in one embodiment, connected to the output of a zero-crossing detector (120, 220), to provide an edge clock signal to a phase angle estimator (122, 226), which is passed to a decision device 124, which provides a symbol estimate which is later decoded into an information message. In an alternative embodiment, a synchronizer is combined with the phase angle estimator (125, 227) to provide as an output, a phase angle estimate which is passed to a decision device (124) which provides a symbol estimate signal (127, 229), which is later decoded to obtain the information message. The alternative embodiment allows recovery of the second symbol which is typically lost in implementing the first embodiment of the system, to avoid second order error effects on recovered data.

REFERENCES:
patent: 4466108 (1984-08-01), Rhodes
patent: 5376894 (1994-12-01), Petranovich
patent: 5453715 (1995-09-01), Lee
patent: 5469112 (1995-11-01), Lee
patent: 5574399 (1996-11-01), Oura et al.
John Park, "An FM Detector for Low S/N", IEEE T-Comm, vol. Com-18, No. 2, Apr. 1970.

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