APPARATUSES, SYSTEMS, AND METHODS FOR COMMUNICATING USING MIMO AND SPREAD SPECTRUM CODING IN BACKSCATTER OF AMBIENT SIGNALS
First Claim
1. A system comprising:
- an ambient RF backscatter transceiver comprising;
an antenna configured to receive a backscattered ambient radio frequency (RF) signal; and
a receiver coupled to the antenna, wherein the receiver is configured to demodulate the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data;
wherein the backscattered ambient RF signal is generated by backscattering an ambient RF signal at a first frequency, the ambient RF signal configured to provide other data at a second frequency.
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Accused Products
Abstract
Apparatuses, systems, ambient RF backscatter transceivers, and methods for communicating using MIMO and spread spectrum coding of backscattered ambient RF signals are described. An example system may include an ambient RF backscatter transceiver that include an antenna configured to receive a backscattered ambient radio frequency (RF) signal, and a receiver coupled to the antenna. The receiver may be configured to demodulate the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data. The backscattered ambient RF signal may be generated by backscattering an ambient RF signal at a first frequency. The ambient RF signal may be configured to provide other data at a second frequency.
39 Citations
37 Claims
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1. A system comprising:
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an ambient RF backscatter transceiver comprising; an antenna configured to receive a backscattered ambient radio frequency (RF) signal; and a receiver coupled to the antenna, wherein the receiver is configured to demodulate the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data; wherein the backscattered ambient RF signal is generated by backscattering an ambient RF signal at a first frequency, the ambient RF signal configured to provide other data at a second frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An ambient RF backscatter transceiver comprising:
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a first antenna configured to receive a backscattered ambient radio frequency (RF) signal and to provide a first backscattered signal, the backscattered ambient RF signal encoded with first data via backscatter modulation of an ambient RF signal at a first frequency, the ambient RF signal modulated to provide second data at a second frequency; a second antenna configured to receive the backscattered ambient radio frequency (RF) signal and to provide a second backscattered signal having a phase offset relative to the first backscattered signal, a receiver coupled to the first antenna and the second antenna, wherein the receiver is configured to demodulate the backscattered ambient RF signal using multiple input, multiple output multiplexing demodulation based on a ratio of a magnitude of the first backscattered signal to a magnitude of the second backscattered signal to provide output bits; and a microcontroller coupled to the receiver and configured to decode the output bits to retrieve data that is transmitted via the backscattered ambient RF signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. An ambient RF backscatter transceiver comprising:
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an antenna configured to receive a backscattered ambient radio frequency (RF) signal, the backscattered ambient RF signal encoded with using spread spectrum coding of data bits via chips via backscatter modulation of an ambient RF signal at a first frequency, the ambient RF signal modulated to provide second data at a second frequency; a receiver coupled to the antenna, wherein the receiver is configured to demodulate the backscattered ambient RF signal using spread spectrum code demodulation based on an in-phase and quadrature-phase correlation to provide output bits; and a microcontroller coupled to the receiver and configured to decode the output bits to retrieve data that is transmitted via the backscattered ambient RF signal. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A method, comprising:
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receiving a backscattered ambient radio frequency (RF) signal at an antenna, the backscattered ambient RF signal encoded with first data via backscatter modulation of an ambient RF signal at a first frequency, the ambient RF signal modulated to provide second data at a second frequency; and demodulating the backscattered ambient RF signal using one of multiple input, multiple output multiplexing demodulation or spread spectrum code demodulation to retrieve the first data. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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Specification