Characterizing channel response in a single upstream burst using redundant information from training tones
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United States of America Patent
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Nov 21, 2006
Grant Date -
Oct 2, 2003
app pub date -
Mar 30, 2002
filing date -
Mar 30, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Characterizing channel response in a single upstream burst using redundant information from training tones (TTs). The invention is operable to utilize inserted TTs, contained within a transmitted data frame, to provide for an improved estimate of a communication channel's actual response and an improved estimate of the noise of the communication channel. The invention determines a maximum allowable delay spread of the many communication paths within a multi-path communication channel. Using the redundant TTs information, then a portion of the finite impulse response of the communication channel, within the time domain, may be zeroed, thereby providing a much improved channel estimate and noise estimate. Using the redundant TTs, less noise is introduced onto the data tones (DTs) within a data frame. The present invention is also able to identify those portions of the TTs that are attributable to the actual channel and those that are attributable to the channel's noise.
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