Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2004-06-28
2008-10-21
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S140000, C375S141000, C375S144000
Reexamination Certificate
active
07440492
ABSTRACT:
Parallel interference cancellers are connected in successive stages. In each canceller, multiple signal paths are provided for interference replica estimators to receive multiple CDMA channels. A spread code is generated for each signal path for dispreading the path components of the channel. In each signal path, the despread components are RAKE combined and a symbol replica is detected therefrom either by detecting or estimating the type of modulation. The detected symbol replicas are re-modulated and then re-spread to produce interference replicas. In each stage, the interference replicas are summed and subtracted from a delayed CDMA signal and then summed with the interference replicas of the same stage. Output signals from the final stage are despread and symbol replicas are recovered therefrom. For each signal path, a spread code is detected from a control channel and compared to the generated spread code. Those symbol replicas where a coincidence is detected are supplied to respective decoders and diversity combined.
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Dickstein , Shapiro, LLP.
Liu Shuwang
NEC Corporation
Perez James M
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