Apparatus and method for improving signal-to-noise ratio in a multi-carrier CDMA communication system
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United States of America Patent
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Mar 24, 2009
Grant Date -
Nov 10, 2005
app pub date -
Jun 21, 2004
filing date -
May 7, 2004
priority date (Note) -
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Abstract
For use in ause in a multi-carrier CDMA receiver, a noise reduction circuit for improving a signal-to-noise ratio of a multi-carrier signal corresponding to a predetermined sequence of chips. Each chip has a value of Logic 0 or Logic 1. The noise reduction circuit comprises a Fast Fourier Transform (FFT) circuit for receiving the multi-carrier signal and generating frequency-domain component signals. A sampling circuit generates a first sequence of samples of the frequency-domain component signals. A controller identifies samples in the first sample sequence corresponding to Logic 0 chips and identifies samples in the first sample sequence corresponding to Logic 1 chips. A randomizing circuit generates a second sample sequence by shifting positions within the first sample sequence of some of the identified samples corresponding to Logic 0 chips, or by shifting positions within the first sample sequence of some of the identified samples corresponding to Logic 1 chips.
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