Method and apparatus for canceling spread-spectrum noise
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United States of America Patent
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Jun 29, 1993
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app pub date -
Jun 29, 1992
filing date -
Jun 29, 1992
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Abstract
A spread-spectrum noise canceller (182) is provided. A received phase and a received amplitude for a first (216) and a second (236) component of a received spread-spectrum signal (200) is determined. The second component (236) is a replica of the first component (216) which was received at a different time. In addition, the spread-spectrum signal (200) includes a known signal. A portion of a spread-spectrum noise signal in the received signal (200) is canceled by generating an estimated signal (270) by spreading (260) the known signal at the second component received phase (204) with the known signal at the first component received phase (224) and adjusting a gain (268) of an integrated form of the spread known signal as a function of the received amplitudes of the first (216) and the second (236) components. Subsequently, the known signal is processed out of the received spread-spectrum signal (200) by subtracting (166) the estimated signal (270) from a demodulated form (216, 236) of the received spread-spectrum signal (200).
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