Method of compensating phase noise at the receiver end of a data

Details Method of compensating phase noise at the receiver end of a data Method of compensating phase noise at the receiver end of a data

1980-04-28

1981-12-29

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 39, 375 99, 329104, 333 18, 328164, H03H 1502, H03K 5159

Patent

active

043086187

ABSTRACT:
Data in the form of multi-value symbols is transmitted at a symbol rate 1/.DELTA.T. At the receiver a decision circuit supplies estimates of the transmitted symbols on the basis of the received symbols. The present invention concerns compensating phase noise after equalization if any of the received symbols and before application of the received symbols to the decision circuit (38, 39). The received symbols are in complex form with in-phase and quadrature components y.sub.k ' and y.sub.k " respectively. Phase noise is compensated by complex multiplication in a multiplier (36) of the received symbols by a complex coefficient.
The invention is particularly applicable to quadrature modulation systems, but if only one channel is transmitted the quadrature channel can be simulated using the Hilbert transform of the one channel.

REFERENCES:
patent: 3868603 (1975-02-01), Guidoux
patent: 3971996 (1976-07-01), Motley
patent: 3974449 (1976-08-01), Falconer
patent: 4053837 (1977-10-01), Ryan et al.
patent: 4091331 (1978-05-01), Kaser et al.
"National Telecommunications Conference" Nov. 29, 30, Dec. 1, and 1975, N.Y., N.Y. Levy--Auto Adaptive Equalizer . . . , pp. 45.2-1 to 45.2-3.
IEEE International Conference on Communications: Jun. 11-13, 1973, N.Y., N.Y., Gibson "Coherent SSBSC Reception . . . ", pp. 2-31-35.

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