RFID systems with low complexity implementation and pallet coding error correction
First Claim
Patent Images
1. A receiver configured to decode a data signal modulated onto a carrier wave, where the data signal has a phase and timing that is ambiguous, comprising:
- an analyzer and equalizer configured to filter an input signal;
an estimation block configured to obtain a baseband representation of the modulated data signal by mixing the filtered input signal with the carrier wave; and
a coherent detector configured to perform recovery of the phase and timing of the modulated data signal in the presence of noise and to determine a sequence of data symbols;
wherein;
the sequence of data symbols includes a preamble known by the receiver;
the coherent detector includes an interpolator that is configured to sample and interpolate the modulated data signal to generate a plurality of streams possessing different symbol rates;
the coherent detector includes a correlator that is configured to select a stream using at least the correlation between the stream and the known preamble; and
the coherent detector is configured to provide the selected stream to a decoder.
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Abstract
Systems and methods for decoding data transmitted by RFID tags are disclosed. One embodiment of the invention includes an analyzer and equalizer configured to filter an input signal, an estimation block configured to obtain a baseband representation of the modulated data signal by mixing the filtered input signal with the carrier wave, and a coherent detector configured to perform phase and timing recovery on the modulated data signal in the presence of noise and to determine a sequence of data symbols.
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Citations
16 Claims
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1. A receiver configured to decode a data signal modulated onto a carrier wave, where the data signal has a phase and timing that is ambiguous, comprising:
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an analyzer and equalizer configured to filter an input signal; an estimation block configured to obtain a baseband representation of the modulated data signal by mixing the filtered input signal with the carrier wave; and a coherent detector configured to perform recovery of the phase and timing of the modulated data signal in the presence of noise and to determine a sequence of data symbols; wherein; the sequence of data symbols includes a preamble known by the receiver; the coherent detector includes an interpolator that is configured to sample and interpolate the modulated data signal to generate a plurality of streams possessing different symbol rates; the coherent detector includes a correlator that is configured to select a stream using at least the correlation between the stream and the known preamble; and the coherent detector is configured to provide the selected stream to a decoder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification