Scaled signal processing elements for reduced filter tap noise

Details Scaled signal processing elements for reduced filter tap noise Scaled signal processing elements for reduced filter tap noise

2009-01-23

2011-12-13

Timory, Kabir A (Department: 2611)

Pulse or digital communications

Equalizers

Automatic

C375S233000, C375S229000, C375S240040, C375S240050, C375S240020, C375S142000, C375S152000, C375S343000

Reexamination Certificate

active

08077767

ABSTRACT:
An adaptive transversal filter having tap weights Wjwhich are products of corresponding tap coefficients Cjand tap gains Mjis provided. A filter control loop controls all of the tap coefficients Cjsuch that an error signal derived from the filter output is minimized. One or more tap control loops controls a tap gain Mksuch that the corresponding tap coefficient Cksatisfies a predetermined control condition. For example, |Ck| can be maximized subject to a constraint |Ck|≦Cmax, where Cmaxis a predetermined maximum coefficient value. In this manner, the effect of quantization noise on the coefficients Cjcan be reduced. Multiple tap control loops can be employed, one for each tap. Alternatively, a single tap control loop can be used to control multiple taps by time interleaving.

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