Least Squares Adaptive Lattice Equalizer.
DEPARTMENT OF THE NAVY WASHINGTON DC
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Document describes an equalizer apparatus which includes a number of successively coupled lattice stages, each of the stages comprising a selected configuration of adjustable electrical components, the input to the first stage of the successively coupled lattice stages comprising the output of a data transmission channel. The equalizer apparatus further includes a subtractor device coupled to the lattice stages for providing a succession of error terms, each of the error terms comprising an accumulation of the squares of a number of error quantities, each of the error quantities indicating the difference between an undistorted training signal, in a sequence of training signals which are received by the subtractor device, and the same training signal after it has travelled through the data transmission channel and is received by the lattice stages. A component adjust device is coupled to respective components of the lattice stages for iteratively adjusting the components in accordance with a least squares procedure, the components being adjusted each time a training signal is received by the subtractor device and the lattice stages, the iterative adjustments continuing so that at the conclusion of the training sequence, the subtractor device generates an error term which is within a prespecified error limit. Author
- Operations Research