The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 2011
Filed:
Feb. 26, 2007
Michael J. Geile, Loveland, OH (US);
Harold A. Roberts, Prior Lake, MN (US);
Michael J. Fort, Blaine, MN (US);
Brian D. Anderson, Plymouth, MN (US);
Jeffrey Brede, Tempe, AZ (US);
Michael J. Geile, Loveland, OH (US);
Harold A. Roberts, Prior Lake, MN (US);
Michael J. Fort, Blaine, MN (US);
Brian D. Anderson, Plymouth, MN (US);
Jeffrey Brede, Tempe, AZ (US);
ADC Telecommunications, Inc., Eden Prairie, MN (US);
Abstract
A multipoint-to-point, orthogonal frequency division multiplexed (OFDM) communication system is provided. The system includes a plurality of remote units and a host unit that includes a demodulator. Each of the remote units transmits an upstream OFDM signal using a multiple access scheme to the host unit demodulator using at least one of a plurality of orthogonal tones within an OFDM waveform. The host unit receives the upstream OFDM signals from a plurality of the remote units, the tones of the upstream signals being substantially orthogonal when received at the host unit. Portions of upstream OFDM signals from at least two of the remote units arrive at the host unit at the same time. The host unit demodulator demodulates the portions of the upstream OFDM signals. The upstream signals from the remote units each include a plurality of symbols and each remote unit times its upstream signal transmission so that when multiple upstream signals arrive at the host unit the symbols of the multiple upstream signals are aligned.