Title:
適応等化器のステップサイズを推定する方法と装置
Document Type and Number:
Japanese Patent JP2008519557
Kind Code:
A
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, ±, used by the adaptive equalizer to update the filter tap coefficient.
Inventors:
Philip J. Pietraski
Michael C. Berli
Alpas randemir
Michael C. Berli
Alpas randemir
Application Number:
JP2007540330A
Publication Date:
June 05, 2008
Filing Date:
October 20, 2005
Export Citation:
Assignee:
Interdigital Technology Corporation
International Classes:
H04B7/005; H03H21/00; H04B3/06
Domestic Patent References:
| JPH05252067A | 1993-09-28 | |||
| JPH0411406A | 1992-01-16 | |||
| JPH04208707A | 1992-07-30 |
Foreign References:
| WO2003069865A1 | 2003-08-21 |
Attorney, Agent or Firm:
Yoshikazu Tani
Kazuo Abe
Kazuo Abe