RO118688B1

5G,4G,3G,2G

Title

SYSTEM AND METHOD FOR SIGNAL MODULATION IN A SPREAD SPECTRUM COMMUNICATION SYSTEM

Application Number:

RO19920001620

Publication Date:

29-08-2003

Current Assignee:

Family ID:

Application Date:

21-06-1991

Declaring Company:

Publication Country:

US

Priority Date:

25-06-1990

Title

SYSTEM AND METHOD FOR SIGNAL MODULATION IN A SPREAD SPECTRUM COMMUNICATION SYSTEM

Application Number:

RO19920001620

Family ID:

Publication Country:

US

Publication Date:

29-08-2003

Application Date:

21-06-1991

Priority Date:

25-06-1990

Current Assignee:

Declaring Company:

Abstract  Abstract

The invention relates to a system and a method for signal modulation in a spread spectrum communication system. Pseudo-noise sequences (PN) are generated by employing spread spectrum communication techniques thereby creating orthogonality between the users so that mutual interference is reduced allowing a higher transmission capacity and better performance of the communication link. Using orthogonal PN codes the cross-correlation is zero over a predetermined time interval resulting in the lack of interference between the orthogonal codes only the time synchronization of the time frames of the codes being required. In a specific embodiment signals are transmitted between a cell-site (12 and 14) and mobile telephone units (16 and 18) using direct sequence spread spectrum communication signals. Pilot- synchronization- paging- and voice-channels are defined in a cell-to-mobile unit transmission link. The information communicated through the communication link channels from the cell to the mobile telephone unit is generally encoded interleaved and bi-phased shift (BPSK) modulated with orthogonal covering of each BPSK symbol but with quadrature phase shift (QPSK) modulation for spreading the covered signals. In a mobile unit-to-cell transmission link access and voice channels are defined. The information communicated through the communication link channels from the mobile telephone unit to the cell is generally encoded interleaved with orthogonal signalling and 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.