Multipoint to point radiocommunications network

Details Multipoint to point radiocommunications network Multipoint to point radiocommunications network

1994-06-16

1998-02-10

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

34087002, H04K 110

Patent

active

057177180

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: 4090135 (1978-05-01), Farstad et al.
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patent: 4914699 (1990-04-01), Dunn et al.
patent: 4940976 (1990-07-01), Gostouniotis et al.
patent: 5048058 (1991-09-01), Kaleh
patent: 5241566 (1993-08-01), Jackson
patent: 5311541 (1994-05-01), Sanderford, Jr.
patent: 5325403 (1994-06-01), Siwiak et al.

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