Method and system for improving modem performance, computer...

Details Method and system for improving modem performance, computer... Method and system for improving modem performance, computer...

2006-07-31

2010-02-16

Wang, Ted M (Department: 2611)

Pulse or digital communications

Transceivers

Modems

C375S219000, C375S260000, C375S285000, C375S295000

Reexamination Certificate

active

07664169

ABSTRACT:
A method controls performance of modem arrangements wherein a plurality of tones having associated gains with a maximum reachable value are used for carrying respective bitstreams. The method includes at least one of selectively swapping bits between the tones in the plurality and selectively changing the tone gains to optimized an error parameter. The method also includes: determining the current values for the associated gain, determining the gain margins between the maximum reachable values and the current values, and performing, to optimize the error parameter as a function of the margins, at least one of: varying the number of bits allocated to the tones, and performing a transmitted power variation by varying the gains.

REFERENCES:
patent: 5479447 (1995-12-01), Chow et al.
patent: 6829307 (2004-12-01), Hoo et al.
patent: 2002/0163973 (2002-11-01), Tsai et al.
patent: 0 918 422 (1999-05-01), None
patent: WO 02/17584 (2002-02-01), None
patent: WO 02/060145 (2002-08-01), None
Tsai, S-H., et al., “Combined BIT Swap and Power Gain Adaptation for Error Rate Equalization in DMT Systems,” inProceedings of the IEEE Int'l. Conference on Acoustics, Speech, and Signal Processing, Quebec, Canada, May 17-21, 2004, pp. 1065-1068.
Cioffi, John M., “Multi-channel Modulation,” Data Transmission Theory course text for EE379A-B and EE479, in preparation, Oct. 27, 2002, 118 pages.

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