Publication number: 20070186258
Abstract: Systems for tone allocation are provided. In one embodiment, a system comprises: a plurality of remote units and a host including a demodulator. Each remote transmits an upstream OFDM signal using a multiple access scheme to the host using an OFDM waveform. The host receives the upstream OFDM signals, the tones of the upstream signals substantially orthogonal when received at the host. Portions of upstream OFDM signals from at least two remotes arrive at the host at the same time. The host demodulates said portions. At least one remote transmits to the host using a first tone allocated by the host. The host sends an adjustment signal to the remote to adjust the timing of transmissions to improve orthogonality of the OFDM waveform. After the remote has begun transmission using the first tone but before the remote has completed its transmission, the host allocates to the remote a different tone.
Type:
Application
Filed:
April 20, 2007
Publication date:
August 9, 2007
Applicant:
ADC TELECOMMUNICATIONS, INC.
Inventors:
Mark Dapper, Michael Geile, Terrance Hill, Harold Roberts, Brian Anderson, Jeffrey Brede, Mark Wadman, Robert Kirscht, James Herrmann, Michael Fort, Steven Buska, Jeff Solum, Debra Enfield, Darrell Berg, Thomas Smigelski, Thomas Tucker, Joe Hall, John Logajan, Somvay Boualouang, Heng Lou, Mark Elpers, Matt Downs, Tammy Ferris, Adam Opoczynski, David Russell, Calvin Nelson, Niranjan Samant, Joseph Chiappetta, Scott Sarnikowski