Coefficient tap leakage for fractionally-spaced equalizers

Details Coefficient tap leakage for fractionally-spaced equalizers Coefficient tap leakage for fractionally-spaced equalizers

1979-03-01

1980-12-02

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 18, 364724, H04B 304

Patent

active

042375541

ABSTRACT:
A quadrature amplitude modulated (QAM) data signal transmitted at T symbols per second is sampled in a data receiver at a rate of 2/T samples per second and applied to a transversal-type equalizer structure (25, 46, 34, 35) having taps spaced at T/2 second intervals. A demodulated equalized signal (a.sub.j, b.sub.j), generated once every T seconds, is quantized to form a decision (a.sub.j *, b.sub.j *) as to the value of the original modulating data symbol. An error signal (e.sub.j, e.sub.j) is formed in response to the pre- and post-quantized values of the demodulated equalized signal. Tap coefficients (c.sub.i (j), c.sub.i (j)) used in generating the equalized signals are updated in response to (a) a correction term which is a function of the error signal and (b) a predetermined tap leakage term which has a constant magnitude. The introduction of the tap leakage term maintains the coefficient values at minimum levels.

REFERENCES:
patent: 3633105 (1972-04-01), Lender et al.
patent: 4006352 (1977-02-01), Sato
patent: 4034199 (1977-07-01), Lampe et al.
patent: 4145747 (1979-03-01), Sakaki et al.
IEEE Transactions on Communications, vol. COM-24 #8, Aug. 1976, Ungerboeck, pp. 856-864.

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