Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2005-09-29
2009-02-24
Lugo, David B (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
Reexamination Certificate
active
07496138
ABSTRACT:
A step-size estimator for controlling the step-size of an adaptive equalizer incorporated in a transceiver, (e.g., a wireless transmit/receive unit (WTRU)). The step-size estimator updates at least one adaptive equalizer tap used by the adaptive equalizer based on an apparent speed of a channel established between the transceiver and another transceiver. The step-size estimator includes a speed estimator, a signal-to-noise ratio (SNR) averager and a step-size mapping unit. The speed estimator is used to estimate the apparent speed of the channel, (i.e., the observed and/or measured rate of change of the channel impulse response). The SNR averager generates a common pilot channel (CPICH) SNR estimate. The step-size mapping unit uses the speed estimate and the CPICH SNR estimate to generate a step-size parameter, μ, and a filter taps leakage factor parameter, α, used by the adaptive equalizer to update the filter tap coefficient.
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Beluri Mihaela
Demir Alpaslan
Pietraski Philip J.
InterDigital Technology Corporation
Lugo David B
Volpe and Koenig P.C.
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