Adaptive system in a digital data receiver providing compensatio

Details Adaptive system in a digital data receiver providing compensatio Adaptive system in a digital data receiver providing compensatio

1981-05-05

1983-10-04

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 99, 333 18, 329 50, H03H 2100

Patent

active

044083327

ABSTRACT:
An adaptive system in a digital data receiver providing compensation for amplitude and phase distortions introduced by the data transmission channel comprises, at the output of the transmission channel (1) which produces a signal vector X.sub.k, a transversal filter (2) with N weighting coefficients, followed by a decision circuit (3). For the direct determination of the N coefficients, the system comprises a circuit (4) for estimating the autocorrelation matrix A of the vectors X.sub.k, a circuit (5) for approximating the estimated matrix by a circulant matrix R.sup.e a circuit (6) for calculating a vector whose components are the eigenvalues of R.sup.e, a circuit (7) for estimating a vector V which expresses the correlation between the output siganls of the channel (1) and the decision circuit (3), calculating circuits (8) and (9), and a circuit (10) for estimating a vector C.sup.R which represents an approximation of the vector of the N optimum weighting coefficients of the filter.

REFERENCES:
patent: 4035735 (1977-07-01), Akashi et al.
H. Nussbaumer "Reducing the Acquisition Time in Automatic Equalizer" Oct. 1975, by IBM Technical Disclosure Bulletin pp. 1465-1479.
Mese & Giul, "On the Use of Smoothing Techniques for Digital Channel Equalzation" 4-7 Jun. 1978 by International Conference on Communication pp. 25.2.1-2.4.

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