Adaptive time diversity and spatial diversity for OFDM
US6985434B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2000 |
| Grant date | Jan 10, 2006 |
| Priority date | — |
| Expiry date | Mar 28, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/0023
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.