Abstract
When decision-directed channel estimation is used for QAM-OFDM systems, the optimal filter shape depends on the amplitudes of the modulated symbols as well as the channel characteristics. In this letter we propose a simple channel estimation method for multi-level-amplitude-modulated systems, which can effectively suppress the estimation variances with a small filter. Using the proposed method the implementation cost can be reduced and possibly better results might be obtained by avoiding the estimation bias due to large-sized filtering.
| Original language | English |
|---|---|
| Pages (from-to) | 1427-1430 |
| Number of pages | 4 |
| Journal | IEICE Transactions on Communications |
| Volume | E86-B |
| Issue number | 4 |
| State | Published - Apr 2003 |
Keywords
- Channel estimation
- Decision-directed
- OFDM
- QAM
- Wireless