Pulse or digital communications – Spread spectrum – Direct sequence
Reissue Patent
2006-11-02
2009-06-02
Wang, Ted (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S148000, C375S150000, C375S152000, C375S346000, C375S354000, C375S213000
Reissue Patent
active
RE040716
ABSTRACT:
A receiver for transmission and parallel interference has multiple access interference suppression stages having K channels, each comprising a correlation device corresponding to a particular pseudorandom sequence and interference generation and suppression device. Each stage delivers to the following stage signals at least partly freed from multiple access interferences. A decision stage receives the signals from the channels of the preceding suppression stage. Each decision stage has a correlation device corresponding to one of the pseudorandom sequences and decision device to deliver data. Devices for producing synchronization signals can control the interference suppression and the decision device. The devices producing the synchronization signals have components placed in the channels of the final stage. Further, the synchronization signals produced by these devices control the decision device of the channels of the final stage and the interference estimation device of the at least one interference suppression stages following appropriate time shifts.
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Buehrer, R.M., et al., “Analysis of DS-CDMA Parallel Interference Cancellation with Phase and Timing Errors,” IEEE Jour. on Sel. Areas of Communications, vol. 14, No. 8, pp. 1522-1535, Oct. 1996.
Lattard Didier
Leveque Sébastien
Ouvry Laurent
Varreau Didier
Commissariat a l''Energie Atomique
Connolly Bove & Lodge & Hutz LLP
Wang Ted
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