US5416797A

5G,4G,3G,2G

Title

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

Application Number:

US19920825147

Publication Date:

16-05-1995

Current Assignee:

Family ID:

Application Date:

24-01-1992

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:

US19920825147

Family ID:

Publication Country:

US

Publication Date:

16-05-1995

Application Date:

24-01-1992

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 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.

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.