DE69133017T2

5G,4G,3G,2G

Title

Not Available

Application Number:

DE1991633017T

Publication Date:

06-02-2003

Current Assignee:

QUALCOMM INC

Family ID:

24168309

Application Date:

21-06-1991

Declaring Company:

QUALCOMM INC

Publication Country:

US

Priority Date:

25-06-1990

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Title

Not Available

Application Number:

DE1991633017T

Family ID:

24168309

Publication Country:

US

Publication Date:

06-02-2003

Application Date:

21-06-1991

Priority Date:

25-06-1990

Current Assignee:

QUALCOMM INC

Declaring Company:

QUALCOMM INC

View on Espacenet goto-link

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 (12 14) and mobile units (16 18) 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.

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 (12 14) and mobile units (16 18) 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.

Note:

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The information in grey was provided by the patent holder

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