Developing a channel impulse response by using distortion

Details Developing a channel impulse response by using distortion Developing a channel impulse response by using distortion

1996-04-04

1998-10-13

Ghebretinsae, Temesghen

Pulse or digital communications

Equalizers

364726, H03H 730

Patent

active

058223681

ABSTRACT:
A digital audio broadcasting (DAB) system includes a radio-frequency (RF) receiver that develops a characterization signal representative of a respective mobile communications channel as a precursor to estimating a channel impulse response. The latter is used to set coefficients of an equalizer of the receiver to compensate for distortion such as intersymbol interference. In generating the channel impulse response a Fast Fourier Transform (FFT) of the characterization signal is performed. The resulting FFT is then clipped such that frequency components above a predetermined upper threshold and less than a predetermined lower threshold are set to the respective threshold values. This allows coefficients for the equalizer to be generated such that the equalizer converges even in the presence of strong reflections in a mobile communications environment.

REFERENCES:
patent: 5627863 (1997-05-01), Aslanis et al.
Patent No. 5,406,586, filed on Jul. 8, 1993 and issued on Apr. 11, 1995 to Jin-Der Wang. Class: 375/96.
Patent No. 5,260,972, filed on Jul. 9, 1991 and issued on Nov. 9, 1993 to Jin-Der Wang. Class: 375/58.
World Media Expo News, "AT&T System Broadcasts Live", by Alan Carter, Sep. 7, 1995.
World Media Expo News, "Reaction in on AT&T DAB Demo", by Alan Carter, Sep. 8, 1995.

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