05479447 is referenced by 765 patents and cites 8 patents.

A method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines wherein the initial optimal transmission bandwidth is identified based on initial signal-to-noise ratio (SNR) estimates of the orthogonal carriers of the multicarrier system. Maximum data throughput, or system performance margin, is achieved by assigning the total amount of information, or number of bits, to be transmitted in each multicarrier symbol to particular carriers through an initial bit allocation procedure, which is possibly subject to variable target bit error rates among the carriers. A transmit power mask, of any shape and level, is imposed upon the system by an initial energy allocation procedure that limits the maximum amount of power to be transmitted in each of the several carriers. Lastly, run-time adaptivity is achieved by monitoring the mean-squared-errors (MSE) of the orthogonal carriers, and the transmission bandwidth, as well as the bit allocation within the multicarrier symbol, is caused to change in real-time corresponding to changes in the channel characteristics in order to maintain optimal system performance.

Title
Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines
Application Number
8/57301
Publication Number
5479447
Application Date
May 3, 1993
Publication Date
December 26, 1995
Inventor
John M Cioffi
Cupertino
CA, US
Peter S Chow
Redwood City
CA, US
Agent
Claude Hamrick
Assignee
The Board of Trustees of the Leland Stanford Junior University
CA, US
IPC
H04L 27/28
H04K 1/10
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