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US 7,068,736 B2Granted
Methods and devices for shortening the convergence time of blind, adaptive equalizers
AssigneeAgere Systems Inc.
InventorCecil William Farrow
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Abstract
The convergence time of a blind, adaptive equalizer is shortened by using a tracking generator. The tracking generator comprises a smoothing filter which receives and smoothes a tap coefficient error estimate derived from an output data stream. Thereafter, a fraction of the smoothed estimate is generated. It is the use of this function of the smoothes estimate which allows the convergence time to be shortened.
Claims17
A blind, adaptive equalizer comprising:
- a coefficient generator for adjusting a tap coefficient;
- and
- a tracking generator, wherein the tracking generator comprises
- a smoothing filter for receiving a tap coefficient error estimate associated with a data sample of an input data stream and for generating a smoothed error from the tap coefficient error estimate wherein the tap coefficient error estimate is generated by multiplying an adjusted equalizer error with the data sample;
- and
- a tracking unit for generating a fractional error from the smoothed error, the coefficient generator adjusting the tap coefficient based on the fractional error.
3 more elements
A method for shortening the convergence time of blind adaptive equalizers comprising:
- receiving a tap coefficient error estimate of an input data stream, wherein the tap coefficient error estimate is generated by multiplying an adjusted equalizer error with a data sample;
- generating a smoothed error from the estimate;
- generating a fractional error from the smoothed error;
- and
- adjusting a tap coefficient in a coefficient generator according to the fractional error.
2 more elements
Dependencies are inferred from the claim text.