Method and apparatus for multiple access over a communication channel
US7065125B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2000 |
| Grant date | Jun 20, 2006 |
| Priority date | — |
| Expiry date | Mar 20, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/041
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
This invention is a multiple access communication technique by which a multitude of transmitters communicate with receivers using direct sequence spread spectrum signaling. The direct sequence codes are reused by a large number of simultaneous transmitters, so the system is named Code Reuse Multiple Access (“CRMA”). This reuse method requires only a small number of codes relative to the number of simultaneous transmitters, and can use as few as one code for all the users. The direct sequence codes are not required to have special properties such as maximal length. The lengths of the spreading codes employed are not necessarily related to the bit or symbol interval. CRMA can be implemented on a Paired Carrier Multiple Access (“PCMA”) system with or without a novel receiver structure which is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.