NDLI: Joint subcarrier power loading and distributed beamforming in OFDM-based asynchronous relay networks

Content Provider	IEEE Xplore Digital Library
Author	Abdelkader, A. Shahbazpanahi, S. Gershman, A.
Copyright Year	2009
Description	Author affiliation: Technische Universität Darmstadt, Germany (Abdelkader, A.; Gershman, A.) \|\| University of Ontario Institute of Technology, Oshawa, Canada (Shahbazpanahi, S.)
Abstract	In this paper, we consider an asynchronous relay network where different relaying paths are subject to different propagation delays thus causing inter-symbol-interference (ISI) at the destination. To eliminate such an ISI, orthogonal frequency division multiplexing (OFDM) is deployed at the source and destination but not at the relays. In fact each relay performs a simple amplify-and-forward operation: it multiply its received signal with a complex coefficient. We model such a network as a multipath channel where the equivalent channel impulse response can be carefully adjusted through optimal design of the complex relay weights. Based on this model, we use a max-min fair design approach where the smallest of the subcarrier SNRs is maximized subject to individual constraints on the source and relay transmit powers. Our numerical results show that the proposed asynchronous scheme achieves SNRs which are only 2 dB lower than those achieved by the synchronous scheme where the relays perfectly compensate their corresponding delays.
Starting Page	105
Ending Page	108
File Size	219725
Page Count	4
File Format	PDF
ISBN	9781424451791
DOI	10.1109/CAMSAP.2009.5413329
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-12-13
Publisher Place	Aruba
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	network beamforming Costs Array signal processing OFDM Conferences Asynchronous relay networks Relays Multipath channels Councils Intersymbol interference Computer networks cooperative communications Propagation delay
Content Type	Text
Resource Type	Article

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