Amelioration in inter-carrier interference in OFDM
US7130355B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2002 |
| Grant date | Oct 31, 2006 |
| Priority date | — |
| Expiry date | Aug 12, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2647
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In an environment where the transmission medium leading to the receiver is time-variant within a block of received signals, and where transmission medium has an finite impulse response extending over a number of symbols intervals, a receiver that includes a filter that, based on an estimate of the transmission channel, is controlled to have filter coefficients that minimize inter-carrier interference due to the intra-block time variations in the transmission medium. The estimate channel coefficients are determined from pilot signals and an interpolation process. When the receiver is an OFDM receiver, the pilot signals are advantageously selected to be in clusters that are equally spaced from each other in the time or the frequency domains. This approach applies to multiple antenna, as well as to single antenna arrangements, and to arrangements that do, or do not use space-time coding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.