Fast acquisition of timing and carrier frequency from received signal
First Claim
1. A method of determining symbol timing in an input signal, comprising the steps of:
- computing a temporally varying magnitude of the input signal;
determining a frequency domain representation of the computed magnitude of the input signal;
identifying a spectral component at a symbol frequency ƒ
s away from a DC component of the frequency domain representation of the computed magnitude of the input signal, the spectral component having a magnitude and a phase; and
determining the symbol timing phase of the input signal from the phase of the spectral component.
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Accused Products
Abstract
A method and apparatus for determining the symbol timing and carrier frequency of a digitized input signal is disclosed. In one embodiment, the method comprises the steps of computing a temporally varying magnitude of the input signal, determining a frequency domain representation of the computed magnitude of the input signal, identifying a spectral component at a symbol frequency ƒs away from a DC component of the frequency domain representation of the computed magnitude of the input signal, the spectral component having a magnitude and a phase, and determining the symbol timing phase of the input signal from the phase of the spectral component.
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Citations
37 Claims
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1. A method of determining symbol timing in an input signal, comprising the steps of:
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computing a temporally varying magnitude of the input signal; determining a frequency domain representation of the computed magnitude of the input signal; identifying a spectral component at a symbol frequency ƒ
s away from a DC component of the frequency domain representation of the computed magnitude of the input signal, the spectral component having a magnitude and a phase; anddetermining the symbol timing phase of the input signal from the phase of the spectral component. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for determining symbol timing in a input signal, comprising:
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means for computing a temporally varying magnitude of the input signal; means for determining a frequency domain representation of the computed magnitude of the input signal; means for identifying a spectral component at a symbol frequency ƒ
s away from a DC component of the frequency domain representation of the computed magnitude of the input signal, the spectral component having a magnitude and a phase; andmeans for determining the symbol timing phase of the input signal from the phase of the spectral component. - View Dependent Claims (7, 8, 9, 10, 11)
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12. An apparatus for determining symbol timing in a input signal, comprising:
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a first processor module for computing a temporally varying magnitude of the input signal; a Fourier transform module for determining a frequency domain representation of the computed magnitude of the input signal; second processor module for identifying a spectral component at a symbol frequency ƒ
s away from a DC component of the frequency domain representation of the computed magnitude of the input signal, the spectral component having a magnitude and a phase; anda third processor module for determining the symbol timing phase of the input signal from the phase of the spectral component. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of acquiring a carrier frequency in a input signal, comprising the steps of:
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computing an Nth power of the input signal; determining a frequency domain representation of the computed Nth power of the input signal, the frequency domain representation including spectral components spaced at ƒ
s/N, wherein ƒ
s is a symbol frequency of the input signal; andselecting one of the spectral components as the acquired carrier frequency. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. An apparatus for acquiring a carrier frequency in a input signal, comprising:
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means for computing an Nth power of the input signal; means for determining a frequency domain representation of the computed Nth power of the input signal, the frequency domain representation including spectral components spaced at
wherein ƒ
s is a symbol frequency of the input signal; andmeans for selecting one of the spectral components as the acquired carrier frequency. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. An apparatus for acquiring a carrier frequency in a input signal, comprising:
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a first processor module for computing an Nth power of the input signal; a Fourier transform module for determining a frequency domain representation of the computed Nth power of the input signal, the frequency domain representation including spectral components spaced at
wherein ƒ
s is a symbol frequency of the input signal; anda second processor module means for selecting one of the spectral components as the acquired carrier frequency. - View Dependent Claims (33, 34, 35, 36, 37)
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Specification