Wireless LAN White Papers
Increasing Time Domain Diversity in OFDM Systems
Overview Delay- and Doppler spread of multipath fading channels have already been identified as sources of diversity in wireless communications systems. However, extensive delay and Doppler spread may cause non-negligible Inter-Symbol Interference (ISI) and/or Inter-Carrier Interference (ICI) in OFDM systems. This paper proposes a method for increasing the Doppler spread of the multipath fading channel without causing additional ICI. The idea is to transmit the OFDM time domain signal predistorted via multiple transmit antennas. The proposed methods can be applied in addition to already existing OFDM systems without any modifications at the receiver, which makes them standard compatible.
| Publisher | Institute of Electrical and Electronics Engineers | File Format | |
|---|---|---|---|
| Date Published | May 2004 | ||
| Format | White Papers | ||
| Topics | |||
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