Method and apparatus for increasing the data rate for a given symbol rate in a spread spectrum system
US5063571A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1989 |
| Grant date | Nov 5, 1991 |
| Priority date | — |
| Expiry date | Dec 27, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/707
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for transmitting a stream of data bits in a spread spectrum format is disclosed. The inventive method comprises providing 2.sup.N predetermined spreading sequences, where N is equal to or larger than 2. The predetermined spreading sequences have suitable autocorrelation and cross-correlation properties. For each group of N bits in a stream of data bits to be transmitted, a particular one from the 2.sup.N predetermined spreading sequences is selected and transmitted. In this manner, each transmitted spreading sequence corresponds to a particular arrangement of N bits. The invention achieves an N-fold increase in data rate for a particular symbol rate by encoding N bits in a spreading sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.