| US 7,489,624 B2 | ||
| Scanning by remotes in multipoint-to-point communication using orthogonal frequency division multiplexing | ||
| Michael J. Geile, Loveland, Ohio (US); Jeffrey Brede, Eden Prairie, Minn. (US); Harold A. Roberts, Eden Prairie, Minn. (US); and Michael J. Fort, Eagan, Minn. (US) | ||
| Assigned to ADC Telecommunications Inc., Eden Prairie, Minn. (US) | ||
| Filed on Jul. 05, 2007, as Appl. No. 11/773,643. | ||
| 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 11/773643 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 2007/0242597 A1, Oct. 18, 2007 | ||
| Int. Cl. H04J 11/00 (2006.01) | ||
| U.S. Cl. 370—208 [370/203] | 4 Claims |
| 1. A method for a remote unit to acquire a frequency band for communication with a host unit in a multipoint-to-point, orthogonal
frequency division multiplexed (OFDM) communication system, the method comprising:
using a multiple access scheme to establish simultaneous multipoint-to-point orthogonal frequency division multiplexing communication
from a plurality of remote units to a host unit;
tuning a first remote unit of the plurality of remote units to a frequency band;
determining whether the frequency band is a valid frequency band for the first remote unit to communicate with the host unit
based on a downstream signal from the host unit transmitted within the frequency band;
when the frequency band is determined to be not valid for the first remote unit, tuning the first remote unit to another frequency
band;
when the frequency band is determined to be valid for the first remote unit, communicating on at least one orthogonal tone
within the frequency band; and
receiving an adjustment signal from the host unit, the adjustment signal instructing the first remote unit to adjust the timing
of transmissions to improve orthogonality of an OFDM waveform received at the host unit;
wherein determining whether the frequency band is a valid frequency band comprises tuning to a control channel within the
frequency band and receiving a downstream signal from the host unit containing an identifier associated with the first remote
unit.
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