Adaptive nonlinear equalizer for digital FM signals

Pulse or digital communications – Receivers – Interference or noise reduction

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375285, H04B 110

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active

057402060

ABSTRACT:
A method for reducing distortion of an information symbol in an information symbol sequence. The information symbol sequence is transformed to a channel symbol sequence for modulating a carrier signal. The channel symbol sequence employs an M-ary signalling scheme. A received signal, which includes a channel symbol, a distortion value and a noise value, is demodulated as a received sample. An index value is determined from a previous information symbol interval. Using the index value the method selects an inverse distortion function for processing the received sample. A corrected sample is calculated using the inverse distortion function. The method determines a value of an information symbol, and a respective index, from the corrected sample. The method includes an adaption phase. The adaption phase adapts the nonlinear equalizer using a linear distortion function. The information symbol sequence is transformed to a channel symbol sequence of an M-ary signalling scheme with index value, for modulating a carrier signal. For each index value, the method includes the step of demodulating a training symbol sequence having pure symbol values as an observed sample sequence. A mean squared value and a mean value is calculated of the observed sample sequence. A mean squared value is calculated of the training symbol sequence. A cross correlation value is calculated. At least two simultaneous equations are solved for coefficients.

REFERENCES:
patent: 4408332 (1983-10-01), Sari
patent: 4468786 (1984-08-01), Davis
patent: 4833693 (1989-05-01), Eguboglu
patent: 4847864 (1989-07-01), Cupo
patent: 5115452 (1992-05-01), Cupo
patent: 5119400 (1992-06-01), Koch
"New Trellis Codes Based on Lattices and Cosets," A.R. Calderbank and N.J.A. Sloane, IEEE Transactions on Information Theory, vol. IT-33, No. 2, pp. 177-195, Mar. 1987.

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