System for remote data collection

• US 6,163,276 A
• Filed: 05/17/1999
• Issued: 12/19/2000
• Est. Priority Date: 05/17/1999
• Status: Expired due to Term

• Current Assignee: Landis+Gyr Innovations Incorporated (Landis+Gyr Group AG)
• Original Assignee: CellNet Data Systems, Inc. (Landis+Gyr Group AG)
• Inventors: Smithers, Colin Richard, Irving, Clive Russell, Summers, Andrew Gordon, Luxford, Gregory Vincent
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): WONG, ALBERT KANG
• Application Number:
  US09/313,132
• Time in Patent Office: 582 Days
• Field of Search: 340/870.02, 340/870.03, 340/870.3, 340/870.4, 340/870.11, 375/133, 375/317, 375/326, 375/302, 375/371, 375/373, 375/375, 375/376, 375/327, 370/204, 329/307, 329/308
• US Class Current: 340/870.4
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: H01Q 11/12 Resonant antennas
• CPC Class Codes: H04L 2027/0055 single phase
• CPC Class Codes: H04L 2027/0073 Detection of synchronisation state
• CPC Class Codes: H04L 2027/0077 stop and go
• CPC Class Codes: H04L 2027/0095 in a preamble or similar structure
• CPC Class Codes: H04L 27/2272 using phase locked loops H04L27/2273 takes precedence
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26
• CPC Class Codes: H04L 7/033 using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
• CPC Class Codes: H04M 11/002 with telemetering systems telemetering in general G08C

Abstract

A remote data collection system for collecting usage data from an endpoint includes a monitoring module coupled to the endpoint, the monitoring module having a wireless transmitter to transmit the usage data. The system also includes a receiver to receive usage data from the wireless transmitter of the monitoring module, the receiver capable of receiving in parallel data transmitted at arbitrary frequencies within a radio channel.

Claims

1. A remote data collection system for collecting usage data from an endpoint, comprising:

a monitoring module coupled to the endpoint, the monitoring module having a wireless transmitter to transmit the usage data, the wireless transmitter including;

a reference oscillator;

a low pass filter coupled to the reference oscillator;

a modulation filter to provide an over-sampled modulated signal;

a synthesizer coupled to the low pass filter and the modulation filter;

a sine wave generator coupled to the synthesizer; and

an antenna coupled to the sine wave generator; and

a receiver to receive usage data from the wireless transmitter of the monitoring module, the receiver capable of receiving in parallel data transmitted at arbitrary frequencies within a radio channel, including;

a radio frequency (RF) front end to convert an RF signal to a digitized signal;

a Fast Fourier Transform (FFT) generator coupled to the RF front-end to separate the digitized signal into a plurality of sub-channels;

a bank of phase locked loops (PLLs) coupled to the FFT generator, each PLL operating on a sub-channel with a sub-channel center;

a flag detector coupled to the bank of PLLs to detect variations from the sub-channel center and to recover the usage data transmitted by the end-point; and

a data communication network coupled to the receiver to communicate the usage data from the endpoint to a database.

2. The system of claim 1, wherein the receiver further comprises a second RF front end coupled to the FFT generator to convert a diversity RF signal to an intermediate frequency and to digitize the intermediate frequency.

3. The system of claim 2, wherein the receiver further comprises a multiplexer coupled to the RF front ends.

4. The system of claim 1, further comprising a decimator coupled to the RF front-end and the FFT generator.

5. The system of claim 4, further comprising a mixer coupled to the decimator.

6. The system of claim 1, wherein the FFT generator produces a stream of values representing a plurality of band pass filters.

7. The system of claim 6, wherein data is transferred at a bit rate and wherein each band pass filter has a center which is spaced by one half the bit rate.

8. The system of claim 1, wherein the transmitter further comprises a harmonic filter coupled to the sine wave generator.

9. The system of claim 1, wherein the transmitter further comprises an amplifier coupled to the sine wave generator.

10. The system of claim 1, wherein the low pass filter further comprises:

a resistor; and

a capacitor coupled to the resistor to provide a resistor capacitor time constant.

11. The system of claim 1, wherein the transmitter further comprises an antenna coupled to the sine wave generator.