Transmission apparatus for a wireless device using delta-sigma modulation
First Claim
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1. A method comprising:
- receiving, on an antenna of a wireless device, an original signal transmitted by a detecting device;
responsive to receiving a digital waveform at a decoder of the wireless device, generating an impedance value, wherein the digital waveform has a modulation type and represents the information from the wireless device and wherein the decoder is coupled to a delta-sigma modulator of the wireless device;
responsive to receiving the impedance value at the delta-sigma modulator, modulating a variable impedance value of a variable impedance circuit of the wireless device, wherein the delta-sigma modulator is coupled to the variable impedance circuit and wherein the antenna is coupled to the variable impedance circuit; and
backscattering a modulated signal, wherein a backscattering coefficient of the antenna changes responsively to the modulated variable impedance value so as to backscatter the original signal as the modulated signal that (i) conveys the information and (ii) has a modulation type matching the modulation type of the digital waveform.
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Abstract
A transmission apparatus for a wireless device, comprising: an antenna for receiving an original signal and for backscattering a modulated signal containing information from the wireless device; a variable impedance coupled to the antenna, the variable impedance having an impedance value; a delta-sigma modulator coupled to the variable impedance for modulating the impedance value, and thereby a backscattering coefficient for the antenna, in accordance with the information to generate the modulated signal; and, a decoder coupled to the delta-sigma modulator for generating the impedance value from the information.
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20 Claims
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1. A method comprising:
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receiving, on an antenna of a wireless device, an original signal transmitted by a detecting device; responsive to receiving a digital waveform at a decoder of the wireless device, generating an impedance value, wherein the digital waveform has a modulation type and represents the information from the wireless device and wherein the decoder is coupled to a delta-sigma modulator of the wireless device; responsive to receiving the impedance value at the delta-sigma modulator, modulating a variable impedance value of a variable impedance circuit of the wireless device, wherein the delta-sigma modulator is coupled to the variable impedance circuit and wherein the antenna is coupled to the variable impedance circuit; and backscattering a modulated signal, wherein a backscattering coefficient of the antenna changes responsively to the modulated variable impedance value so as to backscatter the original signal as the modulated signal that (i) conveys the information and (ii) has a modulation type matching the modulation type of the digital waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 16, 17)
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8. A method comprising:
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receiving, at an inductor of a wireless device, an original signal transmitted by a detecting device; responsive to receiving a digital waveform at a decoder of the wireless device, generating an impedance value, wherein the digital waveform has a modulation type and represents the information from the wireless device and wherein the decoder is coupled to a delta-sigma modulator of the wireless device; responsive to receiving the impedance value at the delta-sigma modulator, modulating a variable impedance value of a variable impedance circuit of the wireless device, wherein the delta-sigma modulator is coupled to the variable impedance circuit and wherein the inductor is coupled to the variable impedance circuit; and transmitting by mutual inductance a modulated signal, wherein a value of the mutual inductance of the inductor changes responsively to the modulated variable impedance value so as to transmit by mutual inductance the modulated signal that (i) conveys the information and (ii) has a modulation type matching the modulation type of the digital waveform. - View Dependent Claims (9, 10, 11, 12, 13, 14, 18, 19, 20)
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Specification