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(i9) United States
(12) Patent Application Publication
Geile et al.
(io) Pub. No.: US 2008/0273607 Al (43) Pub. Date: Nov. 6, 2008
(54) RANGING AND ROUND TRIP DELAY
TIMING ADJUSTMENT IN A MULTI-POINT
TO POINT BIDIRECTIONAL
(75) Inventors: Michael J. Geile, Loveland, OH
(US); Brian D. Anderson,
Plymouth, MN (US); Jeffrey
Brede, Eden Prairie, MN (US);
Robert J. Kirscht, Savage, MN
(US); Michael J. Fort, Pelham, NH
(US); Mark D. Elpers, Elk River,
FOGG & POWERS LLC
10 SOUTH FIFTH STREET, SUITE 1000
MINNEAPOLIS, MN 55402 (US)
(73) Assignee: ADC
INC., Eden Prairie, MN (US)
(21) Appl.No.: 11/686,808
(22) Filed: Mar. 15, 2007
Related U.S. Application Data
(60) Continuation of application No. 11/420,851, filed on May 30, 2006, which is a division of application No.
09/903,273, filed on Jul. 11,2001, now Pat. No. 7,069, 577, which is a continuation of application No. 09/397, 443, filed on Sep. 15, 1999, now Pat. No. 6,279,158, which is a division of application No. 08/673,002, filed on Jun. 28, 1996, now Pat. No. 6,334,219, which is a continuation-in-part of application No. 08/650,408, filed on May 20, 1996, now abandoned, which is a continuation-in-part of application No. 08/457,295, filed on Jun. 1, 1995, now abandoned, which is a continuation-in-part of application No. 08/457,317, filed on Jun. 1, 1995, now abandoned, which is a continuation-in-part of application No. 08/384,659, filed on Feb. 6, 1995, now abandoned.
(51) Int. CI.
H04L 27/28 (2006.01)
(52) U.S. CI 375/260
A bidirectional communication system is provided. In one embodiment, a system comprises a host unit to communicate with a plurality of remote units using orthogonal frequency division multiplexing (OFDM), the plurality of remote units communicatively coupled to the host unit in a multipoint-topoint configuration; and wherein the host unit is configured to adjust a round trip path delay associated with at least one of the plurality of remote units.