Pulse or digital communications – Transceivers – Transmission interface between two stations or terminals
Patent
1997-07-21
1999-09-14
Chin, Stephen
Pulse or digital communications
Transceivers
Transmission interface between two stations or terminals
375260, 370480, 34087003, H04B 138
Patent
active
059533714
ABSTRACT:
A data collection system in which a number of remote terminals (RT) transmit data packets for reception by one or more fixed data collectors (FDC) or a portable data collector (PDC). Each remote terminal (RT) transmits data in two frequency sub-bands to which the fixed and portable data collectors are respectively tuned. Channel capacity is improved in at least the fixed data collector (FDC) sub-band by the use in the remote terminal of minimum shift keying (MSK) encoding and pseudo-random variation of a frequency error applied to the packet transmission frequency for successive packets. In the fixed data collectors dual fast-Fourier transform signal processing enables the interpretation of simultaneous packets with different error frequencies. The use of a single design of remote terminal (RT) in conjunction with portable data collectors (PDC) simplifies system set-up, with the portable collectors providing coverage for those areas where a fixed data collector (FDC) network has yet to be established. The system has particular application to the monitoring of devices such as gas and electricity meters and security systems.
REFERENCES:
patent: 4799059 (1989-01-01), Grindahl et al.
patent: 4940976 (1990-07-01), Gastouniotis et al.
patent: 5278907 (1994-01-01), Snyder et al.
patent: 5311541 (1994-05-01), Sanderford, Jr.
Meek Thomas Robert
Rowsell Francis John
Chin Stephen
Jiang Lenny
Pojunas Leonard W.
Schlumberger Industries Limited
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