Very Narrow Band Multipoint Communication System
First Claim
1. An automatic meter reading system, comprising:
- a plurality of geographically distributed meters;
each meter comprising a transmitter for transmitting communication signals comprising meter data via a communication protocol;
at least one data collection device configured to receive the communication signals from the meters pursuant to the communication protocol;
wherein the communication protocol comprises an operational frequency band divided into a plurality of main channels and application of an interference limiting hopping technique among the main channels; and
wherein each main channel is divided into a plurality of very narrow band sub-channels with frequency division multiplexing among the sub-channels.
0 Assignments
0 Petitions
Accused Products
Abstract
A very narrow band multipoint communication system suitable for use in an automatic meter reading (AMR) system having a communication protocol that divides each main channel of a frequency or digital code hopping system into multiple sub-channels and applies frequency division multiplexing among the sub-channels. Each sub-channel exhibits a very narrow band characteristic that allows gain increase to increases the transmission range of the meters. In addition, frequency division multiplexing among the sub-channels greatly increases the number of meters that can communicate on each main channel. The data collection device demodulates and decodes the multiplexed meter signals at an intermediate frequency with electronic circuitry. The resulting very narrow band AMR system exhibits greater transmission range, greater bandwidth and can accommodate a much larger number of meters per data collection device in comparison to conventional narrow band AMR system.
-
Citations
21 Claims
-
1. An automatic meter reading system, comprising:
-
a plurality of geographically distributed meters; each meter comprising a transmitter for transmitting communication signals comprising meter data via a communication protocol; at least one data collection device configured to receive the communication signals from the meters pursuant to the communication protocol; wherein the communication protocol comprises an operational frequency band divided into a plurality of main channels and application of an interference limiting hopping technique among the main channels; and wherein each main channel is divided into a plurality of very narrow band sub-channels with frequency division multiplexing among the sub-channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A very narrow band communication system, comprising:
-
a plurality of geographically distributed transmitters; each transmitter configured for transmitting communication signals via a communication protocol; at least one data collection device configured to receive the communication signals from the transmitters pursuant to the communication protocol; wherein the communication protocol comprises an operational frequency band divided into a plurality of main channels and application of an interference limiting hopping technique among the main channels; and wherein each main channel is divided into a plurality of very narrow band sub-channels with frequency division multiplexing among the sub-channels. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification