Title:
加入者端末における周波数ドリフト補正
Document Type and Number:
Japanese Patent JP4354530
Kind Code:
B2
Abstract:
A point-to-multipoint star configured terrestrial radio communication system having at least one base station transmitting to and receiving RF communication signals from a plurality of associated subscriber stations in the 0.3-300 GigaHertz (GHz) range. The system includes means for reducing frequency uncertainty, drift or error of the RF transmissions from each of the subscriber stations to the base station. Each subscriber station has a low cost local reference oscillator, and the system incorporates a reference broadcast signal of high frequency precision from the base station and at each subscriber station there is means for measuring frequency error and compensating for frequency drift/error in the low-cost oscillator at the subscriber station. Moreover, the system can provide an estimate obtained from measuring each subscriber frequency drift or error in the base station and relaying the measured error to the corresponding subscriber station to compensate for that subscriber's transmitter's local oscillator be out of frequency.
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Inventors:
Evans, Alan
Chen, Horen
Chen, Horen
Application Number:
JP51983297A
Publication Date:
October 28, 2009
Filing Date:
November 19, 1996
Export Citation:
Assignee:
Alcatel-Lucent USA Inc.
International Classes:
H04N7/20; H03L7/06; H04N7/173; H04N21/462; H04N21/4782; H04Q7/32; H04N5/44
Domestic Patent References:
| JP6507531A | ||||
| JP6244819A | ||||
| JP64011449A |
Foreign References:
| WO1995006362A1 |
Attorney, Agent or Firm:
Shinjiro Ono
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Hideo Tanaka
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Hideo Tanaka