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US 6,549,151 B1Granted
Method and apparatus for acquiring wide-band pseudorandom noise encoded waveforms
AssigneeData Fusion Corporation
InventorsWolfgang Kober, John K. Thomas
Life of this patent
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Abstract
The method and apparatus of the present invention is directed to architectures for signal processing, such as for performing analog-to-digital and digital-to-analog conversions, in which the source signal is decomposed into subband signals by an analysis filter, processed, and the processed subband signals combined to form a reconstructed signal that is representative of the source signal.
Claims48
A method for acquiring a coded signal having a bandwidth, comprising:
- (a) providing a received coded signal having a bandwidth;
- (b) decomposing the received coded signal into a plurality of subband signals, each of the subband signals having an associated bandwidth less than the coded signal bandwidth;
- (c) forming a plurality of subband correlation signals corresponding to the plurality of subband signals;
- (d) combining the plurality of subband correlation signals to form a correlation function corresponding to the received coded signal, the correlation function defining a plurality of peaks;
- (e) determining, based on the correlation function, an estimated transmit time and frequency of at least part of the coded signal;
- and
- (f) determining, based on the estimated transmit time and frequency, a replicated code corresponding to the at least part of the received coded signal.
4 more elements
A method for acquiring a coded signal having a bandwidth, comprising:
- (a) providing a received coded signal having a bandwidth;
- (b) decomposing the received coded signal into a plurality of subband signals, each of the subband signals having an associated bandwidth less than the coded signal bandwidth;
- (c) forming a plurality of subband correlation signals corresponding to the plurality of subband signals;
- (d) combining the plurality of subband correlation signals to form a correlation function corresponding to at least part of the received coded signal, the correlation function defining a plurality of peaks;
- (e) determining, based on the correlation function, an amplitude and time delay for each of the plurality of peaks;
- and
- (f) inputting the amplitudes and delays to a RAKE processor to provide a RAKE signal derived from the at least part of the received coded signal.
4 more elements
A system for acquiring a coded signal having a bandwidth, comprising:
- (a) means for providing a received coded signal having a bandwidth;
- (b) means for decomposing the received coded signal into a plurality of subband signals, each of the subband signals having an associated bandwidth less than the coded signal bandwidth;
- (c) means for forming a plurality of subband correlation signals corresponding to the plurality of subband signals;
- (d) means for deriving from the plurality of subband correlation signals a correlation function corresponding to the received coded signal, the correlation function defining a plurality of peaks;
- (e) first means for determining, based on the correlation function, an estimated transmit time and frequency of at least part of the received coded signal;
- and
- (f) second means for determining, based on the estimated transmit time and frequency, a replicated code corresponding to the at least part of the received coded signal.
4 more elements
A system for acquiring a coded signal having a bandwidth, comprising:
- (a) means for providing a received coded signal having a bandwidth;
- (b) means for decomposing the received coded signal into a plurality of subband signals, each of the subband signals having an associated bandwidth less than the coded signal bandwidth;
- (c) means for forming a plurality of subband correlation signals corresponding to the plurality of subband signals;
- (d) means for deriving from the plurality of subband correlation signals a correlation function corresponding to the received coded signal, the correlation function defining a plurality of peaks;
- (e) means for determining, based on the correlation function, an amplitude and time delay for each of the plurality of peaks;
- and
- (f) RAKE processing means for providing a RAKE signal based on the amplitudes and delays.
4 more elements
A system for acquiring a coded signal having a bandwidth, comprising:
- (a) an input operable to provide a received coded signal having a bandwidth;
- (b) an analysis filter bank operable to decompose the received coded signal into a plurality of subband signals, each of the subband signals having an associated bandwidth less than the coded signal bandwidth;
- (c) a plurality of subband correlators operable to form a plurality of subband correlation signals from the plurality of subband signals;
- (d) a synthesis filter bank operable to form a correlation function corresponding to at least part of the received coded signal from the plurality of subband correlation signals, the correlation function defining a plurality of peaks;
- (e) a pre-detector operable to determine, based on the correlation function, an estimated transmit time and frequency of at least part of the received coded signal;
- and
- (f) a code generator operable to determine, based on the estimated transmit time and frequency, a replicated code corresponding to the at least part of the received coded signal.
4 more elements
A system for acquiring a coded signal having a bandwidth, comprising:
- (a) an input operable to provide a received coded signal having a bandwidth;
- (b) an analysis filter bank operable to decompose the received coded signal into a plurality of subband signals, each of the subband signals having an associated bandwidth less than the coded signal bandwidth;
- (c) a plurality of subband correlators operable to form a plurality of subband correlation signals corresponding to the plurality of subband signals;
- (d) a synthesis filter bank operable to form a correlation function corresponding to at least part of the received coded signal from the plurality of subband correlation signals, the correlation function defining a plurality of peaks;
- (e) a pre-detector operable to determine, based on the correlation function, an amplitude and time delay for each of the plurality of peaks;
- and
- (f) a RAKE processor operable to provide providing a RAKE signal based on the amplitudes and delays and the received coded signal.
4 more elements
Dependencies are inferred from the claim text.