Use of chip repetition to produce a flexible bandwidth DS-CDMA system
US7103026B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2001 |
| Grant date | Sep 5, 2006 |
| Priority date | — |
| Expiry date | Aug 21, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0009
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for obtaining a spreading code set for a code division multiple access (CDMA) communications system. The method includes (a) generating a P′×P′ spreading code set where P′=P/N, where P is the spreading gain in chips/symbol and where N is an integer multiple of 2; and (b) replicating chips in each spreading code by N to produce a P′×P spreading code set. The step of generating may include randomizing the spreading code set by performing at least one or row or column permutation. The P′×P spreading code set is subsequently loaded into system hardware for operating the system hardware with a bandwidth that is less than the bandwidth that would be required to operate with the P′×P′ Hadamard spreading code set. The CDMA system may be a synchronous, direct sequence code division multiple access communications system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.