Demodulator and method for demodulating a carrier signal
First Claim
1. A demodulator, comprising:
- a sampler configured to sample a carrier signal based on a trigger signal to obtain a demodulated signal; and
a trigger unit configured to detect a predefined amplitude value of the carrier signal and provide the trigger signal based on the detected predefined amplitude value, so that the carrier signal is sampled by the sampler with a predefined phase shift, wherein the predefined phase shift is such that a phase shift to a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal is larger than 30°
plus an integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signal,wherein the sampler is configured to sample the carrier signal with a sampling frequency equal to a frequency of the carrier signal with a tolerance of 10% of the frequency of the carrier signal.
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Accused Products
Abstract
A demodulator includes a sampler and a trigger unit. The sampler is configured to sample a carrier signal based on a trigger signal to obtain a demodulated signal. The trigger unit is configured to detect a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal. Further, the trigger unit is configured to provide the trigger signal based on the detected zero crossing or the detected extreme value, so that the carrier signal is sampled by the sampler with a predefined phase shift to the detected zero crossing or the detected extreme value. The predefined phase shift is larger than 30° plus an integer multiple of 90° and lower than 60° plus the same integer multiple of 90° in reference to the carrier signal.
26 Citations
32 Claims
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1. A demodulator, comprising:
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a sampler configured to sample a carrier signal based on a trigger signal to obtain a demodulated signal; and a trigger unit configured to detect a predefined amplitude value of the carrier signal and provide the trigger signal based on the detected predefined amplitude value, so that the carrier signal is sampled by the sampler with a predefined phase shift, wherein the predefined phase shift is such that a phase shift to a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal is larger than 30°
plus an integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signal,wherein the sampler is configured to sample the carrier signal with a sampling frequency equal to a frequency of the carrier signal with a tolerance of 10% of the frequency of the carrier signal. - View Dependent Claims (2, 3, 4, 5)
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6. A demodulator, comprising:
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a sampler configured to sample a carrier signal based on a trigger signal to obtain a demodulated signal; and a trigger unit configured to detect a predefined amplitude value of the carrier signal and provide the trigger signal based on the detected predefined amplitude value, so that the carrier signal is sampled by the sampler with a predefined phase shift, wherein the predefined phase shift is such that a phase shift to a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal is larger than 30°
plus an integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signal,wherein the trigger unit is configured to detect an unmodulated state of the carrier signal and detect the zero crossing of the carrier signal or the extreme value of the amplitude of the carrier signal based on the unmodulated carrier signal. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A transceiver comprising:
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a demodulator comprising; a sampler configured to sample a carrier signal based on a trigger signal to obtain a demodulated signal; and a trigger unit configured to detect a predefined amplitude value of the carrier signal and provide the trigger signal based on the detected predefined amplitude value, so that the carrier signal is sampled by the sampler with a predefined phase shift, wherein the predefined phase shift is such that a phase shift to a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal is larger than 30°
plus an integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signal; andan oscillator unit configured to provide an oscillator signal comprising a carrier frequency, wherein the transceiver is configured to transmit a signal with the carrier frequency based on the oscillator signal and receive the carrier signal in a modulated state or an unmodulated state, wherein the trigger unit is configured to detect an unmodulated state of the carrier signal and detect the zero crossing of the carrier signal or the extreme value of the amplitude of the carrier signal based on the unmodulated carrier signal.
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22. A demodulator comprising:
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an analog-digital-converter configured to sample a carrier signal in a modulated state based on a trigger signal to obtain a demodulated, digital signal; and a trigger unit configured to detect a zero crossing of the carrier signal in an unmodulated state and provide the trigger signal based on the detected zero crossing, so that the carrier signal is sampled by the analog-digital-converter with a predefined phase shift of 45°
plus an integer multiple of 90°
relative to the detected zero crossing in reference to the carrier signal with a tolerance of 5°
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23. A demodulator comprising:
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means for sampling a carrier signal based on a trigger signal to obtain a demodulated signal; means for detecting a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal; and means for providing the trigger signal based on the detected zero crossing or the detected extreme value, so that the carrier signal is sampled by the means for sampling with a predefined phase shift to the detected zero crossing or the detected extreme value, wherein the predefined phase shift is larger than 30°
plus and integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signal,wherein the means for detecting detects an unmodulated state of the carrier signal and detects the zero crossing of the carrier signal or the extreme value of the amplitude of the carrier signal based on the unmodulated carrier signal.
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24. A method for demodulating a carrier signal comprising:
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detecting a predefined amplitude value of the carrier signal; providing a trigger signal based on the detected predefined amplitude value; and sampling the carrier signal based on the trigger signal to obtain a demodulated signal, wherein the trigger signal is provided, so that the carrier signal is sampled with a predefined phase shift, wherein the predefined phase shift is such that a phase shift to a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal is larger than 30°
plus an integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signalwherein detecting the predefined amplitude value of the carrier signal comprises detecting an unmodulated state of the carrier signal and detecting the zero crossing of the carrier signal or the extreme value of the amplitude of the carrier signal based on the unmodulated carrier signal. - View Dependent Claims (25)
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26. Method for demodulating a carrier signal comprising:
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detecting a zero crossing of the carrier signal in an unmodulated state; providing a trigger signal based on the detected zero crossing; and sampling the carrier signal in a modulated state based on the trigger signal to obtain a demodulated, digital signal, wherein the trigger signal is provided, so that the carrier signal is sampled with a phase shift of 45°
plus an integer multiple of 90°
relative to the detected zero crossing in reference to the carrier signal with a tolerance of 5°
.
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27. A computer program product comprising a non-transitory computer readable medium storing program code for performing a method of demodulating a carrier signal, when the computer program product runs on a computer or a microcontroller, the method comprising:
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detecting a predefined amplitude value of the carrier signal; providing a trigger signal based on the detected predefined amplitude value; and sampling the carrier signal based on the trigger signal to obtain a demodulated signal, wherein the trigger signal is provided, so that the carrier signal is sampled with a predefined phase shift, wherein the predefined phase shift is such that a phase shift to a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal is larger than 30°
plus an integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signalwherein detecting a predefined amplitude value of the carrier signal comprises detecting an unmodulated state of the carrier signal and detecting the zero crossing of the carrier signal or the extreme value of the amplitude of the carrier signal based on the unmodulated carrier signal.
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28. A computer program product comprising a non-transitory computer readable medium storing program code for performing a method of demodulating a carrier signal, when the computer program product runs on a computer or a microcontroller, the method comprising:
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detecting a zero crossing of the carrier signal in an unmodulated state; providing a trigger signal based on the detected zero crossing; and sampling the carrier signal in a modulated state based on the trigger signal to obtain a demodulated, digital signal, wherein the trigger signal is provided, so that the carrier signal is sampled with a phase shift of 45°
plus an integer multiple of 90°
relative to the detected zero crossing in reference to the carrier signal with a tolerance of 5°
.
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29. A transceiver, comprising:
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a demodulator comprising; a sampler configured to sample a carrier signal based on a trigger signal to obtain a demodulated signal; and a trigger unit configured to detect a predefined amplitude value of the carrier signal and provide the trigger signal based on the detected predefined amplitude value, so that the carrier signal is sampled by the sampler with a predefined phase shift, wherein the predefined phase shift is such that a phase shift to a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal is larger than 30°
plus an integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signal; andan oscillator unit configured to provide an oscillator signal comprising a carrier frequency, wherein the transceiver is configured to transmit a signal with the carrier frequency based on the oscillator signal and receive the carrier signal in a modulated state or an unmodulated state, wherein the sampler is configured to sample the carrier signal with a sampling frequency equal to a frequency of the carrier signal with a tolerance of 10% of the frequency of the carrier signal.
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30. A demodulator, comprising:
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means for sampling a carrier signal based on a trigger signal to obtain a demodulated signal; means for detecting a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal; and means for providing the trigger signal based on the detected zero crossing or the detected extreme value, so that the carrier signal is sampled by the means for sampling with a predefined phase shift to the detected zero crossing or the detected extreme value, wherein the predefined phase shift is larger than 30°
plus and integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signal,wherein the means for sampling samples the carrier signal with a sampling frequency equal to a frequency of the carrier signal with a tolerance of 10% of the frequency of the carrier signal.
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31. A method for demodulating a carrier signal, the method comprising:
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detecting a predefined amplitude value of the carrier signal; providing a trigger signal based on the detected predefined amplitude value; and sampling the carrier signal based on the trigger signal to obtain a demodulated signal, wherein the trigger signal is provided, so that the carrier signal is sampled with a predefined phase shift, wherein the predefined phase shift is such that a phase shift to a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal is larger than 30°
plus an integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signal,wherein detecting the predefined amplitude value of the carrier signal comprises sampling the carrier signal with a sampling frequency equal to a frequency of the carrier signal with a tolerance of 10% of the frequency of the carrier signal.
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32. A computer program product comprising a non-transitory computer readable medium storing program code for performing a method of demodulating a carrier signal, when the computer program product runs on a computer or a microcontroller, the method comprising:
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detecting a predefined amplitude value of the carrier signal; providing a trigger signal based on the detected predefined amplitude value; and sampling the carrier signal based on the trigger signal to obtain a demodulated signal, wherein the trigger signal is provided, so that the carrier signal is sampled with a predefined phase shift, wherein the predefined phase shift is such that a phase shift to a zero crossing of the carrier signal or an extreme value of an amplitude of the carrier signal is larger than 30°
plus an integer multiple of 90° and
lower than 60°
plus the same integer multiple of 90°
in reference to the carrier signal,wherein detecting the predefined amplitude value of the carrier signal comprises sampling the carrier signal with a sampling frequency equal to a frequency of the carrier signal with a tolerance of 10% of the frequency of the carrier signal.
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Specification