Method and apparatus for full duplex sideband communication
First Claim
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1. A communication system comprising:
- a transmitter adapted to transmit a first frequency-modulated data encoded on a first sideband of a predetermined frequency;
a transponder adapted to receive the encoded data on the first sideband and to transmit a second frequency-modulated data encoded on a second sideband of the predetermined frequency, wherein the second sideband is distinct from the first sideband; and
a receiver adapted to receive the second frequency-modulated data encoded on the second sideband transmitted from the transponder, and to decode the second frequency-modulated data therefrom.
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Abstract
The invention is an apparatus and method for using electromagnetic energy as the means of automatic data collection (ADC). The communication system that comprises the invention utilizes frequency modulated (“FM”) sideband electromagnetic energy to enable full duplex communication with another communication device. In one embodiment one of the communication devices is passive and the carrier is used to power the passive device. In another embodiment the communication devices are active and the carrier is suppressed to increase range or decrease power constraints, as the application requires.
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Citations
18 Claims
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1. A communication system comprising:
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a transmitter adapted to transmit a first frequency-modulated data encoded on a first sideband of a predetermined frequency;
a transponder adapted to receive the encoded data on the first sideband and to transmit a second frequency-modulated data encoded on a second sideband of the predetermined frequency, wherein the second sideband is distinct from the first sideband; and
a receiver adapted to receive the second frequency-modulated data encoded on the second sideband transmitted from the transponder, and to decode the second frequency-modulated data therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An interrogator comprising:
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a transmitter adapted to transmit a signal on a predetermined frequency to a remote communication device which draws power from the signal;
a receiver adapted to receive a signal on a first frequency-modulated sideband of the predetermined frequency from the remote communication device; and
a decoder in electrical communication with the receiver for decoding information from the received signal, wherein the transmitted signal is transmitted on a second frequency-modulated sideband of the predetermined frequency having a nondestructive relationship with the first frequency-modulated sideband and having frequency-modulated data encoded thereon.
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15. A communication system comprising:
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a first communication device having a first transmitter and a first receiver disposed therein, the first transmitter being adapted to transmit a first signal having first frequency-modulated data encoded on a first sideband, the first receiver being adapted to receive signal transmitted on a second sideband of the predetermined frequency and to decode second frequency-modulated data therefrom; and
a second communication device having a second receiver and a second transmitter disposed therein, the second receiver being adapted to receive signal transmitted on the first sideband of the predetermined frequency, the second transmitter being adapted to transmit on the second sideband a second signal having second frequency-modulated data encoded. - View Dependent Claims (16, 17)
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18. A method of radio frequency communication comprising the steps of:
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transmitting a first signal having a carrier and a first sideband which is frequency modulated with origination information that identifies the source of the transmission;
drawing energy from the carrier sufficient to power a passive device;
encoding data onto a second sideband where the data comprises the origination information;
transmitting the encoded data on the second sideband;
receiving the encoded data on the second sideband; and
decoding the received encoded data.
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Specification