Feedforward nonlinear equalization of modulated data signals

Details Feedforward nonlinear equalization of modulated data signals Feedforward nonlinear equalization of modulated data signals

1978-08-04

1980-07-15

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 18, H03H 740

Patent

active

042130956

ABSTRACT:
A feedforward nonlinear signal (P(n)) is added to each sample of a linearly equalized received signal (Q(n)) to provide compensation for nonlinear intersymbol interference. The received signal is a modulated data signal impaired by linear and nonlinear distortion as well as phase jitter and additive noise. The feedforward nonlinear signal added to each sample is comprised of a weighted sum of products of individual ones of the samples and their complex conjugates. Each multiplicand bears a predetermined temporal relationship to the sample currently being processed. In an illustrative embodiment, compensation for second- and third-order intersymbol interference is provided by including two- and three-multiplicand weighted products in the feedforward nonlinear signal. Weighting coefficients for each product are adaptively updated in a decision-directed manner.

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Theory of Mean Square Error QAM System Employing Decision Feedback Equalization, Falconer et al., Bell Syst. T.J., vol. 52, No. 10, Dec. 73, pp. 1821-1849.
Binary Signalling Over Channels Containing Quadratic Nonlinearities, Trans. IEEE Com-22, No. 3, pp. 288-298, Lawless et al.

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