Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1997-07-24
1999-05-11
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375222, 370468, H04K1/10
Patent
active
059036087
ABSTRACT:
Adaptive bit swapping method and device are provided. The method includes the steps of (a) initializing the DMT system to transmit the data via the channel in a steady state; (b) selecting a frame having an inserted sync block from a frame structure of the transmitted data; (c) calculating the signal-to-noise ratios (SNRs) of respective sub-channels of the selected frame; (d) calculating first difference value between the present representative SNRs calculated in step (c) and the previous representative SNRs of each sub-channel; (e) selecting a maximum value and minimum value among the first difference values of the respective sub-channels; (f) obtaining the second difference value between the maximum value and the minimum value; (g) determining whether the second difference value is equal to or greater than the predetermined threshold value; and (h) correcting bit and power assigning tables of a transmitter and a receiver if the second difference value is greater than or equal to the threshold value. In addition, the bit and power assigning tables can be accurately corrected since bits and power are swapped using an actually measured SNR.
REFERENCES:
patent: 4679227 (1987-07-01), Hughes-Hartugs
patent: 5025469 (1991-06-01), Bingham
patent: 5226081 (1993-07-01), Hinokimoto
patent: 5231649 (1993-07-01), Duncanson
patent: 5285474 (1994-02-01), Chow et al.
patent: 5295245 (1994-03-01), Alcorn et al.
patent: 5317596 (1994-05-01), Ho et al.
patent: 5400322 (1995-03-01), Hunt et al.
patent: 5479447 (1995-12-01), Chow et al.
patent: 5521908 (1996-05-01), Younce et al.
patent: 5673290 (1997-09-01), Cioffi
patent: 5696985 (1997-12-01), Crump et al.
patent: 5701444 (1997-12-01), Baldwin
patent: 5727192 (1998-03-01), Baldwin
P.S. Chow, "Bandwidth Optimized Digital Transmission Techniques For Spectrally Shaped Channels With Impulse Noise," May 1993 (A dissertation submitted to the Department of Electrical Engineering and the Committee on Graduate Studies of Stanford University in partial fulfillment of the requirements for the degree of Doctor of Philosophy) (6 pages).
Chin Stephen
Ghayour Mohammad
Samsung Electronics Co,. Ltd.
LandOfFree
Adaptive bit swapping method and device for discrete multitone s does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive bit swapping method and device for discrete multitone s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive bit swapping method and device for discrete multitone s will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-251839