Abstract
This paper describes a channel estimation and tracking scheme for MIMO OFDM systems based on pilot tones. The mean square error of the proposed scheme is derived, and through this we derive optimal training sequences and placement of the pilot tones. It is shown in this paper that the minimum mean square error (MMSE) is obtained with equispaced pilot tones in frequency, equipowered, orthogonal and phase shift orthogonal training sequences. For channels with large excess delay the number of pilot tones required for training is quite large, though a scheme for channel estimation over multiple blocks is proposed. Through simulations it is shown that the optimal training sequences derived in this paper outperform both the random and orthogonal training sequences which appear to be suboptimal. Moreover, an RLS like method is also proposed to enhance channel estimation.
| Original language | English |
|---|---|
| Title of host publication | 2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking: Meeting the Challenge of High-Speed Communications, IZS 2002 - Proceedings |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Pages | 44.1-44.6 |
| ISBN (Print) | 0780372573, 9780780372573 |
| DOIs | |
| Publication status | Published - 2001 |
| Externally published | Yes |
| Event | International Zurich Seminar on Broadband Communications Access - Transmission - Networking, IZS 2002 - Zurich, Switzerland Duration: Feb 19 2002 → Feb 21 2002 |
Other
| Other | International Zurich Seminar on Broadband Communications Access - Transmission - Networking, IZS 2002 |
|---|---|
| Country/Territory | Switzerland |
| City | Zurich |
| Period | 2/19/02 → 2/21/02 |
Keywords
- Channel Estimation
- MIMO Systems
- OFDM
- Training Sequences
- Wireless communication
ASJC Scopus subject areas
- Computer Networks and Communications