Method and apparatus for updating coefficients in a complex...

Details Method and apparatus for updating coefficients in a complex... Method and apparatus for updating coefficients in a complex...

H - Electricity

04

L

H04L 27/01 (2006.01) H04B 1/10 (2006.01) H04L 25/03 (2006.01)

Patent

CA 2073918

Convergence of a complex adaptive equalizer used in digital communications is substantially improved by updating all coefficients of the equalizer during each filter clock cycle. Complex signal data is passed through a plurality of successive delay stages to provide N sets of delayed complex signal data. The product of each set and a complex error signal is obtained. Each product is concurrently updated with previous product data for the set to provide N sets of updated complex coefficients for selective input to equalizer filters. In an illustrated embodiment, the updated coefficients are truncated and their gain is adjusted prior to input to the filters. The updated coefficients can be multiplexed to provide a clocked stream of coefficient sets for input to the equalizer filters. A VLSI implementation of the equalizer is also disclosed.

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