Method and apparatus for demodulating a symbol using symbol fragmentation, correlation and fourier analysis
First Claim
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1. A method in a receiver for demodulating a symbol, comprising the steps of:
- receiving the symbol;
subdividing the symbol into a plurality of fragments;
performing for the plurality of fragments a plurality of correlations with at least one possible symbol value, thereby producing a plurality of complex values corresponding to each fragment and further corresponding to the at least one possible symbol value;
computing from the plurality of complex values a plurality of overall Fourier transforms across a frequency range;
locating a peak value in the plurality of overall Fourier transforms; and
determining the symbol from the peak value.
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Abstract
A method and apparatus receives a symbol and subdivides (720) the symbol into a plurality of fragments. The method and apparatus perform (704) for the plurality of fragments a plurality of correlations with at least one possible symbol value, thereby producing a plurality of complex values corresponding to each fragment and further corresponding to the at least one possible symbol value. From the plurality of complex values a plurality of overall Fourier transforms are computed (706) across a frequency range, and a peak value in the plurality of overall Fourier transforms is located (708). The symbol is then determined (710) from the peak value.
26 Citations
21 Claims
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1. A method in a receiver for demodulating a symbol, comprising the steps of:
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receiving the symbol; subdividing the symbol into a plurality of fragments; performing for the plurality of fragments a plurality of correlations with at least one possible symbol value, thereby producing a plurality of complex values corresponding to each fragment and further corresponding to the at least one possible symbol value; computing from the plurality of complex values a plurality of overall Fourier transforms across a frequency range; locating a peak value in the plurality of overall Fourier transforms; and determining the symbol from the peak value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus in a receiver for demodulating a symbol, the apparatus comprising:
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signal processor means for demodulating the symbol, wherein the signal processor means is programmed to; subdivide the symbol into a plurality of fragments; perform for the plurality of fragments a plurality of correlations with at least one possible symbol value, thereby producing a plurality of complex values corresponding to each fragment and further corresponding to the at least one possible symbol value; compute from the plurality of complex values a plurality of overall Fourier transforms across a frequency range; locate a peak value in the plurality of overall Fourier transforms; and determine the symbol from the peak value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A receiver for demodulating a symbol, the receiver comprising:
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a receiver element for receiving the symbol; and a signal processor for demodulating the symbol, wherein the signal processor is programmed to; subdivide the symbol into a plurality of fragments; perform for the plurality of fragments a plurality of correlations with at least one possible symbol value, thereby producing a plurality of complex values corresponding to each fragment and further corresponding to the at least one possible symbol value; compute from the plurality of complex values a plurality of overall Fourier transforms across a frequency range; locate a peak value in the plurality of overall Fourier transforms; and determine the symbol from the peak value. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification