Apparatus and method for direct measurement of channel state for coded orthogonal frequency division multiplexing receiver
US7486736B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 2004 |
| Grant date | Feb 3, 2009 |
| Priority date | — |
| Expiry date | Jan 4, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03414
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for direct measurement of the channel state of a receiver, such as an OFDM (Orthogonal Frequency Division Multiplexing) receiver. The apparatus adapts a frequency selective channel using a squared Euclidean distance between a received signal value and a de-mapped value for measurement of the channel state and estimates the CSI (Channel State Information) which is also suitable for signal processing with co-channel interference. The estimated CSI may be used in a bit metric calculation of subsequent error correction decoders, such as a Viterbi decoder, to increase system SNR (Signal-to-Noise Ratio) gain. Because receiving equipment, such as digital televisions, receive clearer DVB-T (Terrestrial Digital Video Broadcasting) signals, clearer pictures with less distortion can be displayed, for example, on the digital television.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.