ABSTRACT
Orthogonal frequency division multiplexing (OFDM) modulation and transmission scheme is considered attractive for the implementation in broadband wireless networks since it mitigates the effects of multipath propagation, even in the frequency-selective fading environment. Despite the advantages of OFDM systems, it has been shown that further enhancements regarding quality and capacity of broadband communications over wireless channels are still necessary. Cooperative communications actually use the broadcast nature of the wireless channel and allow interaction among units of wireless networks to jointly transmit information. In its elementary configuration, cooperative communication system comprises of a source station, a destination station and a relaying station (RS). The idea about OFDM based RS performance improvements through subcarrier permutation at relaying station has a substantial potential when its incorporation in future standards for Wireless Local Area Networks and Wireless Wide Area Networks is concerned. The chapter also presents an overview of the key concepts discussed in this book.
