Mixed voice and spread spectrum data signaling with multiplexing multiple users with CDMA
US7796565B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 2006 |
| Grant date | Sep 14, 2010 |
| Priority date | — |
| Expiry date | Nov 16, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/066
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Systems, methods, and devices for mixed voice and spread spectrum data signaling with spread spectrum data hiding with CDMA (Code Division Multiple Access) for three or more users. The disclosed systems, methods, and devices may be implemented in audio conferencing or video conferencing. Various embodiments of the present disclosure provide a data and voice mixer, which includes an improved spread spectrum data hiding transmitter. The transmitter may comprise a CDMA chip sequence generator and a spreading encoder. Different users may be accommodated by selecting different initializations for the registers of the CDMA chip sequence generator. Different spreading code may be used for different users which are near orthogonal to each other. In some embodiments, the CDMA chip sequence generator pseudo-randomly selects the chip sequence from one of a plurality of Gold chip sequence generators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.