Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-07-10
2007-07-10
Payne, David C. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S147000, C375S130000, C375S316000, C375S346000
Reexamination Certificate
active
10148517
ABSTRACT:
A new multiuser detection scheme EPIC (Equalized Parallel Interference Cancellation) is disclosed. A rake receiver signal zRake output by a rake receiver is detected, which receives a spread spectrum composite signal r comprising plural user signals b1,b2, . . . ,bK that have been spread with spreading codes. At first, first hard-decision values bRake are produced on the basis of the rake receiver outputs. Then, first parallel interference cancellation values are produced on the basis of the first hard-decision values, and second hard-decision values bPIC are produced on the basis of the first parallel interference cancellation values. After that, the first and second hard-decision values are combined for producing first combination values, and second parallel interference cancellation values are on the basis of the first combination values. Finally, third hard-decision values are produced on the basis of the second parallel interference cancellation values and the third hard-decision values are output as first stage equalized parallel interference cancellation values bEPIC(1).
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Bu Zhiyong
Lilleberg Jorma
Wang Haifeng
Cohen Pontani Lieberman & Pavane LLP
Lu Jia
Nokia Corporation
Payne David C.
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