Apparatus and method for channel quality estimation and link adaptation in orthogonal frequency division multiplexing (OFDM) wireless communication system
US7116981B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2003 |
| Grant date | Oct 3, 2006 |
| Priority date | — |
| Expiry date | Jun 22, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0216
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for channel quality estimation and link adaptation for an OFDM wireless communication system includes: (a) estimating a channel gain and a noise power, and measuring an SNR in consideration of the estimated channel gain and noise power; (b) calculating a correlation value between an externally received preamble signal and a known preamble signal, and estimating a delay spread; (c) measuring the quality status of a channel in consideration of the measured SNR and the estimated delay spread; and (d) determining parameters including transmit power, data modulation mode, and data rate, according to the measured quality status of the channel, and performing a link adaptation using a protocol for acknowledging a normal signal transmission as well as using the SNR and the delay spread.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.