Pulse or digital communications – Repeaters – Testing
Patent
1989-09-05
1991-02-12
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375101, 375102, H04L 2738
Patent
active
049930478
ABSTRACT:
Characterized nonlinearities in a QAM transmission channel are removed by this linearizer, in which selected bits from a sequence of received symbols on both rails form the address of a PROM. Stored values represent the Volterra expansion of the response of the channel, including the nonlinearity, to the symbol sequence. Symmetries in the Volterra expansion allow the same stored value to be used to correct both AM/AM same rail and AM/PM opposite rail distortion.
REFERENCES:
patent: 3906401 (1975-09-01), Seidel
patent: 4462001 (1984-07-01), Girard
patent: 4565980 (1986-01-01), Ashida
patent: 4644565 (1987-02-01), Seo et al.
patent: 4908840 (1990-03-01), Kakimoto
patent: 4930141 (1990-05-01), Ohmagari
E. Biglieri et al., "Adaptive Cancellation of Nonlinear Intersymbol Interference for Voiceband Data Transmission", IEEE J. Select. Areas Commun., vol. SAC-2, No. 5, pp. 765-777, Sept. 1984.
H. Sari and G. Karam, "Cancellation of Power Amplifier Nonlinearities in Digital Radio Receivers", Proc., ICC-87, vol. 3, pp. 1809-1814, 1987.
J. Grabowski and R. C. Davis, "An Experimental M-QAM Modem Using Amplifier Linearization and Baseband Equalization Techniques", Proceedings, IEEE National Telecommunications Conference, 1982.
P. Vandamme and L. Bourgeade, "Performance of Adaptive Data Predistortion Applied to 2sup2N QAM Radio Systems", GLOBECOM '88, vol. 1, pp. 255-259, Nov. 1988.
Moffatt James P.
Skinner Mitchell A.
AT&T Bell Laboratories
Safourek Benedict V.
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