Radio receiver that digitizes a received signal at a plurality of digitization frequencies
First Claim
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1. A radio receiver, comprising:
- an A/D conversion stage that converts a modulated received signal into a plurality of offset frequency signals and digitizes the plurality of offset frequency signals to provide a corresponding plurality of digitized outputs;
a digital signal processor that determines a plurality of reception quality measures associated with the plurality of the digitized outputs; and
a demodulator that demodulates the modulated received signal, wherein the demodulator demodulates the modulated received signal using the digitized outputs corresponding to an offset frequency signal that provides a better reception quality than that of another offset frequency signal.
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Abstract
A radio receiver converts an original frequency of a modulated received signal into a plurality of digitization frequencies and digitizes the modulated received signal at each one of the plurality of digitization frequencies. The receiver determines a plurality of reception quality measures associated with each one of the digitized modulated received signals at each one of the plurality of digitization frequencies. The receiver demodulates the modulated received signal using a digitized modulated signal at a digitization frequency that provides a better reception quality than those of another digitization frequency.
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Citations
32 Claims
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1. A radio receiver, comprising:
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an A/D conversion stage that converts a modulated received signal into a plurality of offset frequency signals and digitizes the plurality of offset frequency signals to provide a corresponding plurality of digitized outputs;
a digital signal processor that determines a plurality of reception quality measures associated with the plurality of the digitized outputs; and
a demodulator that demodulates the modulated received signal, wherein the demodulator demodulates the modulated received signal using the digitized outputs corresponding to an offset frequency signal that provides a better reception quality than that of another offset frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio receiver, comprising:
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a pre-A/D conversion stage that converts an original frequency of a modulated received signal into a plurality of digitization frequencies;
an A/D conversion stage that digitizes the received signal at each one of the plurality of digitization frequencies to provide a corresponding plurality of digitized outputs;
a post-A/D conversion stage that converts each one of the plurality of digitized outputs at the digitization frequencies to a common frequency; and
a demodulator that demodulates the received signal using a digitized output. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for demodulating a modulated signal, comprising:
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converting an original frequency of a modulated received signal into a plurality of offset frequency signals;
digitizing the plurality of offset frequency signals to provide a corresponding plurality of digitized outputs;
converting each one of the plurality of digitized outputs to a common frequency; and
demodulating the received signal using a digitized output. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
determining a plurality of reception quality measures associated with each one of the digitized modulated received signals corresponding to the plurality of offset frequency signals.
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28. The method of claim 24, wherein the plurality of offset frequency signals are digitized substantially simultaneously.
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29. The method of claim 24, wherein the plurality of offset frequency signals are digitized substantially non-simultaneously at a corresponding plurality of non-current sampling intervals.
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30. The method of claim 29, wherein the plurality of offset frequencies are offset from each other by a predefined number of channel spacings.
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31. The method of claim 29, further including the step of introducing a dithering signal while digitizing the modulated received signal.
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32. The receiver of claim 24, wherein the plurality of A/D converters digitize the plurality of offset frequency signals at a rate defined by a sampling frequency fs.
Specification