Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions
Patent
1993-11-24
1998-02-03
Gregory, Bernarr E.
Multiplex communications
Generalized orthogonal or special mathematical techniques
Particular set of orthogonal functions
375206, 375309, 379 59, 380 34, 455 331, 455 541, H04L 2730
Patent
active
057152365
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 cell-to-mobile link, pilot, sync, paging and voice channels are defined. Information communicated on the cell-to-mobile link channels are, in general, encoded, interleaved, bi-phase shift key (BPSK) modulated with orthogonal covering of each BPSK symbol along with quadrature phase shift key (QPSK) spreading of the covered symbols. In the mobile-to-cell link, access and voice channels are defined. Information communicated on the mobile-to-cell link channels are, in general, encoded, interleaved, orthogonal signalling along with QPSK spreading.
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Gilhousen Klein S.
Jacobs Irwin M.
Padovani Roberto
Viterbi Andrew J.
Weaver, Jr. Lindsay A.
Gregory Bernarr E.
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Miller Russell B.
Qualcomm Incorporated
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