Bounds on the delay-constrained capacity of UWB communication with a relay node

Authors:
Zolfa Zeinalpour-Yazdi;Masoumeh Nasiri-Kenari;Behnaam Aazhang;Joachim Wehinger;Christoph F. Mecklenbräuker
Affiliations:
Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran;Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran;Department of Electrical and Computer Engineering, Rice University, Houston, TX;Infineon Technologies, Munich, Germany;Vienna University of Technology and Telecommunication Research Center, Vienna, Austria
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

We derive bounds on the expected capacity and outage capacity of a three-node relay network for UWB communications. We also provide a simple tight approximation for the derived upper bound on the capacity and then using this bound we obtain the outage probability of the network. Numerical results show that a significant improvement in the system capacity and outage probability is obtained by adding a relay node. Moreover, our theoretical results reveal that the diversity gain of a relay channel substantially increases by using UWB links instead of NB links. We also derive these bounds when we have a constraint on the total transmitted power of the source and the relay nodes.