Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Reexamination Certificate
2005-11-29
2009-11-10
Beamer, Temica M (Department: 2617)
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
C385S002000, C385S003000, C359S010000, C359S011000
Reexamination Certificate
active
07616618
ABSTRACT:
An optical code division multiple access (OCDMA) system includes an optical transmitter system configured to transmit data from a plurality of users through a shared optical channel by encoding the data from each user with a spreading code assigned to that user. Each spreading code includes a unique sequence of T time chips along a time axis. The data from each user is representable by T symbols. The OCDMA system further includes an optical receiver system configured to demodulate the data from each user by correlating signals received from the transmitter system with the spreading code assigned to that user. When transmitting a data symbol for each user, the transmitter system selects one out of T distinct cyclic shifts of the spreading code assigned to that user, and transmits the selected cyclic shift of the assigned spreading code along the time axis.
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Kumar, P.V. et al. Coding Group Contribution to 18-Month Milestone. PowerPoint presentation made to SPAWAR monitor at USC, Apr. 26, 2004.
Kumar, P.V. et al. Secure Communication Over LANs Using Optical CDMA Technology: A Unified Novel Architecture / Coding / System / Device Approach. PowerPoint presentation made at USC to DARPA Grant Director, May 14, 2004.
Kumar, P.V. et al. Three-Fold Increase in Number of Active Users in an O-CDMA System Using Novel Code-Cycle Modulation. Made ready for a conference, Sep. 15, 2004. Copyright 2005 Optical Society of America. 3 pages.
Kumar P. Vijay
Omrani Reza
Saghari Poorya
Touch Joseph D.
Willner Alan E.
Beamer Temica M
McDermott Will & Emery LLP
University of Southern California
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