Auto-orthogonalizing system of equalization adapted to a range o

Details Auto-orthogonalizing system of equalization adapted to a range o Auto-orthogonalizing system of equalization adapted to a range o

1983-06-10

1985-10-15

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

364825, 333 28R, H04B 110

Patent

active

045478899

ABSTRACT:
The adaptive auto-orthogonalizing equalizer in the discrete frequency domain comprises a filter with N cells operating by the overlap-save method, a decision element which assigns one of the possible levels to the filtered samples, and a control circuit which at each iteration varies the cell gains on the basis of the input samples, the output samples and the decided symbols, and which comprises an estimator (S.sub.A) for estimating the gradient of the mean square error, an estimator (S.sub.B) for estimating a matrix which modifies said gradient such that its direction always passes as close as possible to the minimum to be sought, a projector (P.sub.S) for projecting said corrected gradient into a constraint region, and a circuit for adjusting the filter cell gain vector at each iteration.

REFERENCES:
patent: 3864632 (1975-02-01), Chang
patent: 4021738 (1977-05-01), Gitlin et al.
patent: 4027258 (1977-05-01), Perreqult
patent: 4430743 (1984-02-01), Watanabe
R. D. Gitlin and F. R. Magee, Jr., "Self-Orthogonalizing Adaptive Equalization Algorithms", IEEE Transactions on Communications, vol. Com-23, No. 7, Jul. 1977.
Giorgio Picchi & Giancarlo Prati, "Self-Orthogonalizing Adaptive Equalization in the Discrete Frequency Domain", IEEE Transactions on Communications, vol. Com-32, No. 4, Apr. 1984.

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