CDMA system using quasi-orthogonal codes
US7133353B2 · kind B2 · utility
27Cited by
13References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2001 |
| Grant date | Nov 7, 2006 |
| Priority date | — |
| Expiry date | Dec 29, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0034
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A CDMA communication system uses a set of quasi-orthogonal codes to supplement the standard set of Walsh codes used in conventional systems. Users are assigned a code selected from the set of Walsh codes, if available. If the number of users exceeds the number of available Walsh codes, selected users are assigned to quasi-orthogonal codes. The users assigned quasi-orthogonal codes are chosen based on user mobility.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.