Adaptive equaliser
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United States of America Patent
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-
Aug 8, 2000
Grant Date -
N/A
app pub date -
Sep 10, 1996
filing date -
Oct 21, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An adaptive equaliser particularly for equalising digital signals with analogue modulation, where use is made of a training sequence formed by a previously known sequence of symbols which is applied to said equaliser simultaneously with the demodulated signal present in the receiver. In this way a first estimate is made of the coefficients of the filter or filters of the equaliser that compensate the linear distortions in the transmission channel. The training sequence (TS), before being used in the equaliser (CEQ), is first applied to a lowpass filter whose transfer function is the same as that of the premodulation filter employed in the modulator. This transfer function also incorporates distortion effects, both linear and non-linear, to which the data are subjected in the receive side when they have been demodulated prior to their detection or regeneration.
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