| Publisher | Institute of Electrical and Electronics Engineers | ||
|---|---|---|---|
| Format | 213.7KB PDF, requires Acrobat Rdr 5 | Date added | 22 Nov 2004 |
| Topics | Modems, Mobile - Wireless Communications, Wireless LAN | ||
| Downloads | 76 | ||
Orthogonal frequency division multiplexing (OFDM) can be used with a multiple-input multiple-output (MIMO) system to improve communication quality and capacity. Pilot-symbol-aided or decision-directed channel estimation must be used to track the variations of the channel. However, while pilot symbols facilitate channel estimation, they reduce the transmit energy for data symbols per OFDM symbol under a fixed total transmit power constraint. This paper analyzes the effects of pilot-symbol-aided channel estimation on the lower bound of the system capacity in MIMO-OFDM systems with three different types of pilot patterns: independent, scattered, and orthogonal.
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