Self-referenced differential decoding of analog baseband signals
First Claim
1. A wireless communication apparatus, comprising:
- a baseband filtering stage operable to receive a differential phase shift keyed (DPSK) analog baseband signal differentially encoded with phase shift differences in successive symbol periods, the baseband filtering stage being operable to selectively pass frequencies in the DPSK analog baseband signal within a passband frequency range to produce a filtered analog signal; and
a differential decoder comprising a delay circuit and a combiner circuit, wherein the delay circuit produces from the filtered analog signal a reference signal that preserves values of a feature of the filtered analog signal for one symbol period, and the combiner circuit combines values of a feature of the filtered analog signal during a current symbol period with values of the reference signal to produce a resultant signal representing a differential decoding of the DPSK analog baseband signal.
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Abstract
Apparatus and methods of differentially decoding analog baseband signals are described. In one aspect, a wireless communication apparatus includes a baseband filtering stage and a differential decoder stage. The baseband filtering stage receives a DPSK analog baseband signal differentially encoded with phase shift differences in successive symbol periods. The baseband filtering stage selectively passes frequencies in the DPSK analog baseband signal within a passband frequency range to produce a filtered analog signal. The differential decoder includes a delay circuit and a combiner circuit. The delay circuit produces from the filtered analog signal a reference signal that preserves values of a feature of the filtered analog signal for one symbol period. The combiner circuit combines values of a feature of the filtered analog signal during a current symbol period with values of the reference signal to produce a resultant signal representing a differential decoding of the DPSK analog baseband signal.
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Citations
20 Claims
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1. A wireless communication apparatus, comprising:
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a baseband filtering stage operable to receive a differential phase shift keyed (DPSK) analog baseband signal differentially encoded with phase shift differences in successive symbol periods, the baseband filtering stage being operable to selectively pass frequencies in the DPSK analog baseband signal within a passband frequency range to produce a filtered analog signal; and
a differential decoder comprising a delay circuit and a combiner circuit, wherein the delay circuit produces from the filtered analog signal a reference signal that preserves values of a feature of the filtered analog signal for one symbol period, and the combiner circuit combines values of a feature of the filtered analog signal during a current symbol period with values of the reference signal to produce a resultant signal representing a differential decoding of the DPSK analog baseband signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A wireless communication method, comprising:
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receiving a differential phase shift keyed (DPSK) analog baseband signal differentially encoded with phase shift differences in successive symbol periods;
bandpass filtering the DPSK analog baseband signal by selectively passing frequencies in the DPSK analog baseband signal within a passband frequency range to produce a filtered analog signal;
producing from the filtered analog signal a reference signal that preserves values of a feature of the filtered analog signal for one symbol period; and
combining values of a feature of the filtered analog signal during a current symbol period with values of the reference signal to produce a resultant signal representing a differential decoding of the DPSK analog baseband signal. - View Dependent Claims (18, 19)
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20. A wireless communication apparatus, comprising:
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means for receiving a differential phase shift keyed (DPSK) analog baseband signal differentially encoded with phase shift differences in successive symbol periods;
means for bandpass filtering the DPSK analog baseband signal by selectively passing frequencies in the DPSK analog baseband signal within a passband frequency range to produce a filtered analog signal;
means for producing from the filtered analog signal a reference signal that preserves values of a feature of the filtered analog signal for one symbol period; and
means for combining values of a feature of the filtered analog signal during a current symbol period with values of the reference signal to produce a resultant signal representing a differential decoding of the DPSK analog baseband signal.
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Specification