Pulse or digital communications – Repeaters – Testing
Patent
1997-02-11
1999-05-25
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375200, 375201, 375202, 375354, 375358, 375362, 370281, 370295, 370480, 370491, H04B 1500, H04K 100, H04L 2730, H04J 100
Patent
active
059075775
ABSTRACT:
In a discrete tone system, a base station receives a transmission burst from a remote unit being installed that includes delay compensation pilot tones that are uniformly spread throughout the transmission bandwidth. The arrival time transmission burst is not synchronized with the other remote units transmitting to the base station. The base station measures the phase delay of each tone and calculates the delay of the remote unit from the slope of the line of phase angle versus tone frequency. The base station transmits a signal to the remote unit that includes the magnitude and direction of the delay, which allows the remote unit to adapt the timing of its transmission to be synchronized with the other remote units.
REFERENCES:
patent: 4835517 (1989-05-01), van der Gracht et al.
patent: 5295152 (1994-03-01), Gudmundson et al.
patent: 5410538 (1995-04-01), Roche et al.
patent: 5732068 (1998-03-01), Takahashi et al.
patent: 5732113 (1998-03-01), Schmidl et al.
patent: 5799000 (1998-08-01), Hoole
AT&T Wireless Services
Chin Stephen
Maddox Michael W.
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