05416797 is referenced by 352 patents and cites 11 patents.

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, hi-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.

Title
System and method for generating signal waveforms in a CDMA cellular telephone system
Application Number
543496
Publication Number
5416797
Application Date
January 24, 1992
Publication Date
May 16, 1995
Inventor
Andrew J Viterbi
La Jolla
CA, US
Lindsay A Weaver Jr
San Diego
CA, US
Roberto Padovani
San Diego
CA, US
Irwin M Jacobs
La Jolla
CA, US
Klein S Gilhousen
San Diego
CA, US
Agent
Russell B Miller
Assignee
Qualcomm Incorporated
CA, US
IPC
H04L 27/30
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