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

1981-05-14

1983-07-19

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 18, 364724, H04L 2503

Patent

active

043947689

ABSTRACT:
An adaptive system in a digital data receiver providing compensation for amplitude and phase distortions introduced by the data transmission channel having, at the output of the transmission channel which supplies a signal vector X.sub.k, a transversal filter having N weighting coefficients, followed by a decision circuit and further a summing circuit and a multiplying circuit. To determine the N coefficients iteratively the system comprises a circuit for determining an estimated matrix A.sub.k of the autocorrelation matrix A of the signal vectors X.sub.k, a circuit for approximating A.sub.k by a circulant matrix R.sub.k, a circuit for calculating the diagonal matrix G.sub.k whose diagonal elements are the eigenvalues of R.sub.k, a number of calculating circuits and a circuit for up-dating the vector C.sub.k which represents the N weighting coefficients of the filter at the instant t.sub.o +kT.

REFERENCES:
patent: 4035735 (1977-07-01), Akashi et al.
H. Nussbaumer "Reducing the Acquistion Time in Automatic Equalizer" Oct. 1975 by IBM Technical Disclosure Bulletin, pp. 1465-1479.
Mese & Givili "On the Use of Smoothing Techniques for Digital Channel Equalization" Jun. 4-7, 1978 by International Conference on Communication, pp. 25.21-2.4.

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