Proximity detection using DPSK waveform

Details Proximity detection using DPSK waveform Proximity detection using DPSK waveform

1994-09-30

1997-05-06

Chin, Wellington

Communications: electrical

Continuously variable indicating

With meter reading

34082549, G08C 2100

Patent

active

056275269

ABSTRACT:
A method and system for determining whether a transmitting unit is proximate a receiving unit wherein the transmitting unit includes a magnetic field generator for a providing a plurality of time-sequential magnetic fields, each of the sequences being a differential phase shift key (DPSK) modulated code. The magnetic field is transmitted at a relatively interference free frequency of 72 KHz and the DPSK modulation frequency is about 1200 bits per second. Each pair of transmitting and receiving unit uses with a distinguishing code selected from a predetermined group of generally orthogonal codes.

REFERENCES:
patent: 5235326 (1993-08-01), Beigel et al.
patent: 5257011 (1993-10-01), Beigel
patent: 5317309 (1994-05-01), Vercellotti et al.
patent: 5451941 (1995-09-01), Lamazou et al.

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