Method of reducing phase noise at the receiver end of a data tra

Details Method of reducing phase noise at the receiver end of a data tra Method of reducing phase noise at the receiver end of a data tra

1980-04-28

1981-12-15

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

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

Patent

active

043063071

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 m.sub.k

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, 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., NY; Gibson "Coherent SSBSC Reception . . . " pp. 2-31-35.

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