Radio transmitting apparatus and method for transmitting OFDM signals from different antennas according to the degree of multiplexing
US8102831B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 2002 |
| Grant date | Jan 24, 2012 |
| Priority date | — |
| Expiry date | Feb 1, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/006
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The degree of multiplexing of a code division multiplexed signal transmitted by subcarriers is selected on a subcarrier-by-subcarrier basis. As a result, inter-code interference on the propagation path and degradation on the propagation path are lower for a code division multiplexed signal allocated to subcarriers with a low degree of signal multiplexing than for transmit signals allocated to subcarriers with a high degree of multiplexing. Thus, it is possible to prevent degradation of the error rate characteristics of important information without lowering spectral efficiency significantly as compared with the case in which the degree of signal multiplexing is decided uniformly for all subcarriers, and to achieve compatibility between spectral efficiency and error rate characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.