Differential multiple-norm transmit diversity with forward error correction and related diversity reception
US7616703B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 2003 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Apr 13, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2001/0096
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
To provide transmission and reception diversity schemes for a powerful, flexible and less complex bandwidth-efficient space-time modulation scheme there is proposed a method of and apparatus for differential multiple-norm space-time transmit diversity from a unitary space-time modulation scheme using at least two transmit antennas. In a first step a group of transmission bits is divided into a first sub-group of transmission bits and a second sub-group of transmission bits. In a second step the first sub-group of transmission bits is mapped onto a constellation matrix of a differential unitary space-time modulation scheme. In a third step a scaling factor is determined from the second sub-group of transmission bits. In a fourth step a transmission matrix is sep up through differential encoding of the constellation matrix and a previously determined transmission matrix in combination with scaling by the scaling factor. The differential multiple-norm transmit diversity according to the present invention improves distance properties of the modulation scheme which are relevant for achievable error rates and extends higher order modulation also to the area of differential transmit diver…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.