Method and system for determining data rate using sub-band capacity
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United States of America Patent
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N/A
Issued Date -
May 29, 2003
app pub date -
Jan 18, 2002
filing date -
Jul 31, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention is directed to methods and systems for providing an accurate estimate of the channel capacity that may be performed for each symbol rate tested during line probe. In addition, an optimal symbol rate under a set of conditions may be determined using the capacities for each tested symbol rate. In the G.SHDSL (or other) standard, provisions may be made for rate negotiation to take place between two communicating modems after a line probe session. The present invention provides an approach to rate negotiation that implements an approximation of channel capacity using a geometric mean calculation. The capacity for a plurality of M frequency sub-bands may be computed to find an estimate of channel capacity for a rate of interest. The sub-bands may be any segment of a total N frequency bands found with a discrete Fourier transform (DFT) or other method of spectrum estimation.
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