Pulse or digital communications – Spread spectrum
Reexamination Certificate
2006-02-28
2006-02-28
Chin, Stephen (Department: 2634)
Pulse or digital communications
Spread spectrum
C375S146000, C375S140000, C370S342000
Reexamination Certificate
active
07006554
ABSTRACT:
A dynamic assignment of the spreading codes of a user in a CDMA system is based on multipath channel conditions of that user. The spreading codes are assigned such that multipath signal energies are coherently integrated at the antenna of the receiver to ensure that the multipath components are summed constructively and therefore that a signal gain is obtained. The method is applicable to any CDMA system which uses spreading codes over a multipath channel. A specific algorithm for selecting the codes based on channel parameters and auto-correlation functions of the spreading codes is proposed.
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Jiunn-Tsair Chen, C.B. Papadias and G. J. Forschini “Dynamic Signature Assignment for Direct-Sequence CDMA Systems”, IEEE Communications Letters, vol. 4, No. 6, Jun. 2000, pp. 181-183.
A. Duel-Hallen, et al. “Long-Range Prediction of Fading Signals”, IEEE Signal Processing Magazine, vol. 17, No. 3, May 2000, pp. 62-75.
Ma Yugang
Sun Xiaobing
Chin Stephen
Frommer William S.
Frommer & Lawrence & Haug LLP
Sony Corporation
Ware Cicely
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