Frequency synchronized bidirectional radio system

Details Frequency synchronized bidirectional radio system Frequency synchronized bidirectional radio system

H - Electricity

04

B

H04B 7/24 (2006.01) H04B 1/56 (2006.01) H04B 7/26 (2006.01) H04J 1/06 (2006.01) H04J 3/06 (2006.01) H04L 25/06 (2006.01) H04L 27/233 (2006.01) H04L 27/38 (2006.01) H04B 1/40 (2006.01) H04L 7/033 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2126102

A bidirectional radio system for low cost, high through-put accumulation of data from a large number of site units. The site units are connected to remote radio transceivers in radio communication with a plurality of base stations (44). Accurate frequency synchronization allows multiple carriers within a 12.5 kHz FCC bandwidth. Frequency synchronization is achieved at !ow cost by transmitting a high accuracy carrier and clock signal at a base station, and using receiving circuitry (54) at remote stations to ex- tract the base clock signal and base carrier frequency and a phase-lock loop (258 and 248) to stabilize the remote station carriers. The reception circuitry at a remote station provides independent carrier frequency and clock rate recovery, a phase-lock loop at baseband, and a coarse clock rate recovery circuit (316) coupled to a fine clock rate recovery circuit (320). Remote station re- sponses are time domain multiplexed. A base station receiver can decode a very short remote station response by scaling the re- sponse with the phase and amplitude of an initial segment of the response. Spatial reuse of carrier frequencies further increases the rate of data throughout.

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