Method and apparatus for fast modulation in synchronous CDMA communications
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United States of America Patent
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Jan 26, 1999
Grant Date -
N/A
app pub date -
Jan 6, 1997
filing date -
Jan 6, 1997
priority date (Note) -
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Abstract
A system and method for modulating synchronous CDMA (S-CDMA) signals in antenna array wireless system. By taking advantage of the symmetric property of Walsh code words utilized in S-CDMA perform modulation of signals intended for a plurality of users. The system includes a Fast Hadamard Transform (FHT) Processor that realizes baseband operations including spreading and digital combining in one step. In addition to significant reduction in computations and storage over prior methods, the invention also provides substantial advantages in hardware implementation. While the exemplary embodiment is described in the context of antenna array CDMA systems, the disclosed techniques have general applications in CDMA systems with arbitrary symbol values.
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