Self-adaptive equalizer circuit for a differentially coherent de

Details Self-adaptive equalizer circuit for a differentially coherent de Self-adaptive equalizer circuit for a differentially coherent de

1989-12-29

1991-06-25

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 84, H04B 304

Patent

active

050273710

ABSTRACT:
A self-adaptive equalizer circuit for a receive using differential demodulation, and in particular for a receiver using a plurality of paths in diversity (1, 2). For each diversity path (1, 2) there is a self-adaptive filter (18, 19) placed before the differential demodulation. The coefficients (CO to Cn) of the filter are updated at each instant KT, where T is the symbol rate period, using the formula:

REFERENCES:
patent: 4035725 (1977-07-01), Guidoux
patent: 4097807 (1978-06-01), Fujimura
patent: 4140974 (1979-02-01), Lindner
patent: 4247940 (1981-01-01), Mueller et al.
1987 IEEE International Symposium on Circuits and Systems, Philadelphia, Pa., May 4-7, 1987, vol. 2, pp. 422-425, IEEE, New York, U.S.: T. B. Evans et al., "Variable Stepsize Methods for the LMS Adaptative Algorithm", col. 1, line 29-col. 2, line 5, FIG. 1.
IEEE International Conference on Communications, Minneapolis, Minn., Jul. 17-19, 1974, pp. 25D-1-25D-5.
IEEE New York, U.S.: J. W. Barksdale et al.: "A Linear Digital Equalizer for Fast Initialization", FIG. 1, p. 25D-2, col. 2, lines 23-32.

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