Code division multiplex system using selectable length spreading code sequences
US4930140A · kind A · utility
103Cited by
6References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1989 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Jan 13, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J13/16
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A code division multiplex system for use in a spread spectrum communication system utilizes selectable length spread spectrum spreading code sequences. At the encoder, one of a pluraluty of a spread spectrum spreading code sequences having a given fixed length is selected for differential encoding in accordance with the input data to be transmitted. At the receiver correlator, a selectable length differential decoder is set to be responsive to a spread spectrum spreading code sequence having a length substantially equal to the length of the encoded spread spectrum spreading code sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.