US 7,539,126 B2
Ranging and round trip delay timing adjustment in a multi-point to point bidirectional communication system
Michael J. Geile, Loveland, Ohio (US); and Jeffrey Brede, Eden Prairie, Minn. (US)
Assigned to ADC Telecommunications, Inc., Eden Prairie, Minn. (US)
Filed on Mar. 15, 2007, as Appl. No. 11/686,888.
Application 11/420851 is a division of application No. 09/903273, filed on Jul. 11, 2001, granted, now 7,069,577, filed on Jun. 27, 2006.
Application 09/397443 is a division of application No. 08/673002, filed on Jun. 28, 1996, granted, now 6,334,219, filed on Dec. 25, 2001.
Application 11/686888 is a continuation of application No. 11/420851, filed on May 30, 2006.
Application 09/903273 is a continuation of application No. 09/397443, filed on Sep. 15, 1999, granted, now 6,279,158, filed on Aug. 21, 2001.
Application 08/673002 is a continuation in part of application No. 08/650408, filed on May 20, 1996, abandoned.
Application 08/650408 is a continuation in part of application No. 08/457295, filed on Jun. 01, 1995, abandoned.
Application 08/457295 is a continuation in part of application No. 08/457317, filed on Jun. 01, 1995, abandoned.
Application 08/457317 is a continuation in part of application No. 08/384659, filed on Feb. 06, 1995, abandoned.
Prior Publication US 2007/0147229 A1, Jun. 28, 2007
This patent is subject to a terminal disclaimer.
Int. Cl. H04J 11/00 (2006.01); H04B 7/216 (2006.01); H04K 1/10 (2006.01); H04W 4/00 (2006.01); H04W 36/00 (2006.01)
U.S. Cl. 370—208  [370/328; 370/335; 370/342; 375/260; 455/437] 13 Claims
OG exemplary drawing
 
1. A method for an orthogonal frequency division multiplexing (OFDM) multipoint-to-point communications system, the method comprising:
transmitting up to a plurality of tones from a first remote unit of a plurality of remote units to a host unit, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point configuration using orthogonal frequency division multiple access, wherein the up to a plurality of tones from the first remote unit are configured to combine with at least one tone from at least one tone from at least one other remote unit of the plurality of remote units to a unified OFDM waveform of adjacent spectrally overlapping carriers at the host unit; and
adjusting a round trip path delay associated with the first remote unit.