1
Peter S Chow, John M Cioffi: Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines. The Board of Trustees of the Leland Stanford Junior University, Claude Hamrick, December 26, 1995: US05479447 (765 worldwide citation)

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 multi ...


2
Jacky Chow, John M Cioffi: Method for equalizing a multicarrier signal in a multicarrier communication system. The Board of Trustees of the Leland Stanford Junior University, Claude Hamrick, February 8, 1994: US05285474 (324 worldwide citation)

A method for optimizing a set of equalizer parameters of an equalizer to be used to equalize a multicarrier data signal that has been transmitted through a distorting channel, comprised of the steps of initializing the parameters, repeatedly sending a training sequence through the channel to the rec ...


3
John M Cioffi: Discrete multi-tone data transmission system using an overhead bus for synchronizing multiple remote units. Amati Communications, Hickman Beyer & Weaver, April 29, 1997: US05625651 (199 worldwide citation)

A bi-directional data transmission system that facilitates communications between a central unit and a plurality of remote units using a frame based discrete multi-tone (DMT) transmission scheme is disclosed. The discrete multi-tone data transmission system has a multiplicity of discrete subchannels ...


4
John M Cioffi: ADSL compatible discrete multi-tone apparatus for mitigation of T1 noise. Amati Communications Corporation, Hickman Beyer & Weaver, May 21, 1996: US05519731 (193 worldwide citation)

An improved discrete multi-tone transmission scheme is describe that contemplates encoding digital data and modulating the encoded data onto a discrete multi-tone signal having a total bandwidth of at least 1.6 MHz. The modulation system is capable of dynamically updating the subcarriers used and th ...


5
John M Cioffi, Po Tong, James T Aslanis, Antoinette H Gooch: Multicarrier modulation transmission system with variable delay. Amati Communications Corporation, Hickman Beyer & Weaver, January 21, 1997: US05596604 (178 worldwide citation)

A transmission system using multicarrier modulation applies FECC (forward error correcting code) coding and codeword interleaving differently to input signals from a plurality of different data channels to produce encoded data signals having different reliabilities and different coding delays. Bits ...


6
John M Cioffi: Method and apparatus for crosstalk cancellation. Amati Communications, Beyer & Weaver, March 23, 1999: US05887032 (119 worldwide citation)

An apparatus or system for data communications that provides crosstalk cancellation is disclosed. The apparatus or system removes crosstalk interference (e.g., NEXT interference) from received signals on a given line by adaptively estimating the crosstalk interference induced by certain other of the ...


7
Minnie Ho, John M Cioffi: Method and apparatus for echo cancellation with discrete multitone modulation. The Board of Trustees of the Leland Stanford Junior University, Claude Hamrick, May 31, 1994: US05317596 (104 worldwide citation)

A method of echo cancellation in a full-duplex data communication system with discrete multitone modulation, comprised of an initial step of initializing a set of frequency-domain echo parameters and a set of corresponding time-domain echo parameters, and further including the repeating steps of blo ...


8
Jose Tellado, John M Cioffi: Peak to average power ratio reduction. The Board of Trustees of the Leland Stanford Junior University, Beyer Weaver & Thomas, November 6, 2001: US06314146 (93 worldwide citation)

The present inventions provide methods and systems for reducing the peak to average power ratio of a multi-carrier signal. Reducing the peak to average power ratio of a signal ensures that amplifiers and transmitters are not saturated, causing loss of data. Further, reducing peak to average power ra ...


9
John M Cioffi, John A C Bingham, Mark P Mallory: Digital sound broadcasting using a dedicated control channel. Amati Communications Corporation, Hickman Beyer & Weaver, November 17, 1998: US05838799 (83 worldwide citation)

A method and apparatus for transmitting digital sound is disclosed. The method contemplates transmitting a digital radio signal (such as an FM band signal) over a plurality of sub-channels subject to some constraints on the digital signal power. A control sub-channel, sometimes referred to as an aux ...


10
Richard Dale Wesel, John M Cioffi: Transmission system using code designed for transmission with periodic interleaving. The Board of Trustees of the Leland Stanford Junior University, Claude Oppenheimer Wolff & Donnelly Hamrick, Emil Cheng, September 26, 2000: US06125150 (82 worldwide citation)

The present invention discloses an OFDM transmission system providing a high level of performance on a variety of frequency selective channels by using a code having the characteristics of maximum PPD and maximum PECL, and a constellation having size 2.sup.n where n generally is greater than k+1, wh ...