Pulse or digital communications – Synchronizers
Reexamination Certificate
2005-12-07
2010-11-23
Tran, Khai (Department: 2611)
Pulse or digital communications
Synchronizers
C375S130000
Reexamination Certificate
active
07839960
ABSTRACT:
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN codes, the cross-correlation is zero over a predetermined time interval, resulting in no interference between the orthogonal codes, provided only that the code time frames are time aligned with each other. In an exemplary embodiment, signals are communicated between a cell-site and mobile units using direct sequence spread spectrum communication signals. In the exemplary embodiment, transmit power of mobile unit signals is controlled based on signal power received by the mobile unit and power adjustment commands sent to the mobile unit.
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Gilhousen Klein S.
Jacobs Irwin M.
Padovani Roberto
Viterbi Andrew J.
Weaver, Jr. Lindsay A.
Braden Stanton
Qualcomm Incorporated
Tran Khai
LandOfFree
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