Modem receiver with nonlinear equalization

Details Modem receiver with nonlinear equalization Modem receiver with nonlinear equalization

1992-01-08

1993-07-06

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 8, H03H 730, H03H 740

Patent

active

052260607

ABSTRACT:
A modem with nonlinear equalization (100) receives a signal (101) that includes linear and nonlinear distortion. The modem includes a multiplier (107) that frequency shifts the signal to form a baseband signal, which is then sampled by an A/D converter (114) to provide a complex receiver input sample, R(n). A first equalizer (117) equalizes R(n) to form a first equalized result (n). A nonlinear generator (129) forms .vertline.R(n).vertline..sup.2 R(n), which is then equalized by a second equalizer (133) to form a second equalized result (n). A summing device (121) combines the first equalized result (n) with the second equalized result (n) to form a composite equalized result (n). The modem includes a data recovery circuit (125) that determines a received signal point (n) based on the composite equalized result (n) and a predetermined constellation.

REFERENCES:
patent: 4213095 (1980-07-01), Falconer
"Adaptive Equalization of Channel Nonlinearities on QAM Data Transmission Systems", by D. D. Falconer, The Bell System Technical Journal, vol. 57, No. 7, Sep. 1978.

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