Frequency synchronized bidirectional radio system

Details Frequency synchronized bidirectional radio system Frequency synchronized bidirectional radio system

1994-12-21

1997-02-18

Chin, Stephen

Pulse or digital communications

Transceivers

Transmission interface between two stations or terminals

375221, 375317, 375326, 375356, 370350, 455 76, H04B 138, H04L 516

Patent

active

056047681

ABSTRACT:
A bidirectional radio system for low-cost high-throughput accumulation of data from a large number of site units. Frequency synchronization is achieved at low cost by transmitting a high accuracy carrier and clock signal at a base station, and using receiving circuitry at remote stations to extract the base clock signal and base carrier frequency and a phase-lock loop to stabilize the remote station carriers. A burst demodulator at a base station receiver can decode a short remote station response by scaling the response with the phase and amplitude of an initial segment of the response. The burst demodulator may continuously update the decoding threshold based on a comparison of the signal amplitude and the current value of the decoding threshold. In an alternate embodiment, the carrier synthesizer is not part of a phase-lock loop, but the transmitted signal is rotated by a phase proportional to a frequency error to provide an accurate carrier frequency. In yet another alternate embodiment only a frequency-control loop is implemented, and again the transmitted signal is rotated by a phase ramp proportional to a frequency error to provide an accurate carrier frequency. In this embodiment separate rotators may be used on both the transmission and reception sides of the circuit, or a single rotator may be switched between the transmission and reception sides of the circuit for half-duplex operation.

REFERENCES:
patent: 2757279 (1956-07-01), Vosburgh
patent: 3931575 (1976-01-01), Amoroso, Jr.
patent: 4451930 (1984-05-01), Chapman et al.
patent: 4489413 (1984-12-01), Richmond et al.
patent: 4513447 (1985-04-01), Carson
patent: 4532635 (1985-07-01), Mangulis
patent: 4587661 (1986-05-01), Schiff
patent: 4590602 (1986-05-01), Wolaver
patent: 4631738 (1986-12-01), Betts et al.
patent: 4651330 (1987-03-01), Ballance
patent: 4703520 (1987-10-01), Rozanski, Jr. et al.
patent: 4727333 (1988-02-01), Dieterich
patent: 4993048 (1991-02-01), Williams et al.
patent: 5003559 (1991-03-01), Kanai et al.
patent: 5187719 (1993-02-01), Birgenheier et al.
patent: 5216717 (1993-06-01), Bourcet et al.
patent: 5260974 (1993-11-01), Johnson et al.
patent: 5367535 (1994-11-01), Scholz
patent: 5377232 (1994-12-01), Davidov et al.
patent: 5469762 (1995-10-01), Wang et al.

Affiliated with

Also associated with

Rating

Frequency synchronized bidirectional radio system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency synchronized bidirectional radio system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency synchronized bidirectional radio system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1607545