Multiple bit complex bit modulation
US7072382B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2002 |
| Grant date | Jul 4, 2006 |
| Priority date | — |
| Expiry date | Jul 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J2013/0037
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A wireless communications base station (10) having a digital bit modulation function (72) is disclosed. The bit modulation function (72) may be realized by a software routine executable by a programmable device such as a digital signal processor (40), or alternatively by dedicated logic circuitry. The bit modulation function (72) receives a datastream corresponding to the payload, and a scrambling code, each of which include an in-phase component and a quadrature component. The bit modulation function (72) corresponds to a split adder (94) that performs a Gray Code addition of corresponding bits of the in-phase and quadrature data components with corresponding bits of the in-phase and quadrature scrambling code components. The result is a combined in-phase bit and a combined quadrature bit for each bit position in the datastream. The Gray Code addition takes the place of a complex multiplication, thus saving significant processing capacity or reducing circuit complexity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.