Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1997-12-16
2000-06-13
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375222, 375225, 375295, H04L 2728
Patent
active
06075821&
ABSTRACT:
An adaptive process for optimizing the bit and energy configurations of data sub-channels in a multi-channel data transmission signal is disclosed. The inventive process is preferably embodied in one or more microcode routines executable by a high speed digital signal processor. A first routine initializes the transmission system, while a second routine adaptively changes system parameters as necessary to accommodate channel performance changes, varying target bit rates, etc. Both of the routines monitor, analyze and store sub-channel signal-to-noise characteristics, determine theoretical bit capacity loading, evaluates power performance margin, and optimize sub-channel configurations based on a series of iterative calculations intended to maximize the overall system power performance margin for any given target data rate. Alternatively, for a given power performance margin, the achieved data rate can be maximized. To achieve these results, a number of non-zero bit sub-channels (N.sub.CH) are remembered from iteration to iteration, which results in a more optimal loading of the sub-channels. A unique new approach is also disclosed for deciding which of the sub-channels should be disabled to have a zero bit loading. If adjustments to bit loadings are required to achieve a particular initial target rate, those sub-channels which will have the least effect on the overall system performance margin are adjusted first, so that compliance with system performance margin requirements is better achieved. In addition, an "iteration criteria" count can be incorporated in the process to ensure that sub-channel loadings can be effectuated (at least to a very close order) in a predetermined and controlled fashion. The resulting bit/energy loadings can be adjusted to be fully compliant with applicable Discrete Multi-Tone (DMT) implementations of Asymmetric Digital Subscriber Loop (ADSL) protocols.
REFERENCES:
patent: 4535472 (1985-08-01), Tomcik
patent: 4731816 (1988-03-01), Hughes-Hartogs
patent: 4756007 (1988-07-01), Qureshi et al.
patent: 4757495 (1988-07-01), Decker et al.
patent: 4802189 (1989-01-01), Wedler
patent: 4899384 (1990-02-01), Crouse et al.
patent: 4980897 (1990-12-01), Decker et al.
patent: 5023869 (1991-06-01), Grover et al.
patent: 5198818 (1993-03-01), Samueli et al.
patent: 5231649 (1993-07-01), Duncanson
patent: 5243629 (1993-09-01), Wei
patent: 5282019 (1994-01-01), Basile et al.
patent: 5305352 (1994-04-01), Calderbank et al.
patent: 5313467 (1994-05-01), Varghese et al.
patent: 5321725 (1994-06-01), Paik et al.
patent: 5400322 (1995-03-01), Hunt et al.
patent: 5469502 (1995-11-01), Matsumoto
patent: 5479447 (1995-12-01), Chow et al.
patent: 5515368 (1996-05-01), Saito et al.
patent: 5519731 (1996-05-01), Cioffi
patent: 5521906 (1996-05-01), Grube et al.
patent: 5619492 (1997-04-01), Press et al.
patent: 5623513 (1997-04-01), Chow et al.
patent: 5644573 (1997-07-01), Bingham et al.
patent: 5715280 (1998-02-01), Sandberg et al.
patent: 5790550 (1998-08-01), Peeters et al.
patent: 5812599 (1998-09-01), Van Kerckhove
patent: 5822372 (1998-10-01), Emami
patent: 5822374 (1998-10-01), Levin
patent: 5832387 (1998-11-01), Bae et al.
patent: 5852633 (1998-12-01), Levin et al.
patent: 5903608 (1999-05-01), Chun
patent: 5982813 (1999-11-01), Dutta et al.
Rupert Baines, "ADSL Community Faces Line Code Challenge," Electronic News, May 5, 1997, p. 48.
Pini Losowick, "VDSL Gains As Technology Barriers Fall," Electronic News, May 5, 1997, p. 52.
Stefan Knight, "ADSL On Fast Track To Revolutionize Work World," Electronic News, May 5, pp. 43 and 46.
Uwe Hering, "Market To Support Several Implementations of xDSL," Electronic News, May 5, pp. 56 and 73.
Peter S. Chow, et al, "A Practical Discrete Transceiver Loading Algorithm for Data Transmission over Spectrally Shaped Channel," IEEE Transactions on Communications, vol. 43, No. 2/3/4, Feb./Mar./Apr., 1995, pp. 773-775.
Peter Kraniauskas, "A Plain Man's Guide to the FFT," IEEE Signal Processing Magazine, Apr. 1994, pp. 24-35.
Antonio Ruiz et al. "Discrete Multiple Tone Modulation with Coset Coding for the Spectrally Shaped Channel," IEEE Transactions on Communications, vol. 40, No. 6, Jun. 1992, pp. 1012-1029.
John M. Cioffi, "A Multicarrier Primer," ANSI Contribution TIE14/91-1578, Deerfield Beach, Florida, Nov. 1991.
Jacky S. Chow et al. "A Discrete Multitone Transceiver System for HDSL Applications," IEEE Journal on Selected Areas in Communications, vol. 9 No. 6, Aug. 1991, pp. 895-908.
Peter S. Chow et al., "Performance Evaluation of a Multichannel Transceiver System for ADSL and VHDSL Services," IEEE Journal on Selected Areas in Communications, vol. 9, No. 6, Aug. 1991.
John A.C. Bingham, "Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come," IEEE Communications Magazine, vol. 28, No. 5, May 1990, pp. 5-14.
Chen Chunta
Kao Chiihsin
Liu Ming-Kang
Chin Stephen
Ghayour Mohammad
Integrated Telecom Express
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