2009-05-26

Some recent results in cooperative wireless relaying

Prof. Dr. Armin Wittneben, Swiss Federal Institute of Technology (ETH), Zurich

4 Jun 2009, 10:00; Location: S3|06-146

Existing wireless networks are designed for coexistance, i.e. essentially for interference avoidance. In contrast cooperative wireless communication intentionally accepts interference to optimize network performance. In this talk we start out with a brief introduction to cooperative wireless

communication and in particular wireless relaying. Subsequently we review three recent research result for relaying in cellular and ad hoc wireless networks:
In cellular systems relaying can improve coverage and reduce the required number of basestations with infrastructure access. Conventional half duplex relaying requires two channel uses from source to destination. Recently two-way relaying has been proposed as an efficient way to recoup this loss. In this framework we consider a novel scheme, which utilizes the typical self interference of two-way relaying for channel estimation. In wireless ad hoc networks coherent multiuser relaying schemes achieve a distributed spatial multiplexing gain by utilizing the relays for distributed interference cancellation. One drawback of these schemes is the large overhead introduced by the dissemination of channel state information. We discuss a new distributed gradient based scheme, which substantially reduces this overhead in two-hop relay networks.

Finally we consider coherent multiuser relaying schemes with multiple relay layers (multihop). Special emphasis is on gain allocation and the diversity-multiplexing tradeoff.

Category: CE Seminar

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