CA2085890C

5G,4G,3G,2G

Title

System and method for generating signal waveforms in a CDMA cellular telephone system

Application Number:

CA19912085890

Publication Date:

08-01-2002

Current Assignee:

Family ID:

Application Date:

21-06-1991

Declaring Company:

Publication Country:

US

Priority Date:

25-06-1990

Title

System and method for generating signal waveforms in a CDMA cellular telephone system

Application Number:

CA19912085890

Family ID:

Publication Country:

US

Publication Date:

08-01-2002

Application Date:

21-06-1991

Priority Date:

25-06-1990

Current Assignee:

Declaring Company:

Abstract  Abstract

A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructedthat provide orthogonality between the users so that mutual interferencewill be reduced allowing higher capacity and better link performance. Withorthogonal PN codes the cross-correlation is zero over a predetermined time interval resulting in no interference between the orthogonal codesprovided only that the code time frames are time aligned with each other. In an exemplary embodiment signals are communicated between a cell-site(12 14) and mobile units (16 18) using direct sequence spread spectrumcommunication signals. In the cell-to-mobile link pilot sync paging andvoice channels are defined. Information communicated on the cell-to-mo- bile 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 en- coded interleaved orthogonal signalling along with QPSK spreading.

Note:

The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)

The information in grey was provided by the patent holder

The information in purple was extracted from the FrandAvenue

Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.

Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.

Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.

Family member:related patents or applications that share a common priority or original filing.