Least squares lattice decision feedback equalizer

Details Least squares lattice decision feedback equalizer Least squares lattice decision feedback equalizer

1981-04-30

1983-03-01

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 18, 364553, 375 14, H04L 2503

Patent

active

043756921

ABSTRACT:
An improved equalizer receives the output of a data transmission channel at he first stage of a number of successively coupled lattice stages which are each made up of a selected configuration of adjustable electrical components. A subtractor device is coupled to the lattice stages for providing a succession of error terms. The error terms are an accumulation of the squares of a number of error quantities, which are the differences between a sequence of undistorted training signals or estimates of the transmitted signal which are received by the subtractor device, and the same training signals after they have travelled through the data transmission channel. A delayed stage and two dimensional vector matrices are coupled in each of the lattice stages for iteratively adjusting their components in accordance with a least squares procedure, that is, the components are adjusted each time a signal is received and the iterative adjustment continues until a prespecified error limit is reached.

REFERENCES:
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patent: 3836734 (1974-09-01), Campanella et al.
patent: 4072830 (1978-02-01), Gitlin et al.
patent: 4129753 (1978-12-01), Duttweiler
patent: 4141072 (1979-02-01), Perreault
patent: 4144417 (1979-03-01), Oshima et al.
patent: 4253184 (1981-02-01), Gitlin et al.
patent: 4328585 (1982-05-01), Monsen

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