Volterra linearizer for digital transmission

Pulse or digital communications – Repeaters – Testing

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Details

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:
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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.

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