Multi-hop capacity of MIMO-multiplexing relaying systems

Authors:
Ahmed Iyanda Sulyman;Glen Takahara;Hossam S. Hassanein;Maan Kousa
Affiliations:
Department of Electrical Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia;Department of Mathematics and Statistics, Queen's University, Kingston, ON, Canada;School of Computing, Queen's University, Kingston, ON, Canada;Department of Electrical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

This paper derives the multi-hop capacity of OFDM-based MIMO-multiplexing relaying systems. MIMO-multiplexing relaying presents a spectrally efficient means of realizing mesh supports in wireless networks operating over licensed bands by providing separate links for access and mesh relaying services on the same broadband radio channel. We show that for an N×N MIMO-multiplexing relaying system with amplification factor α at relay nodes, R-hops relaying degrade the capacity by at most -Nlog2 (α2R/(1 +Σr=1R α2rNr)) + RNlog2(N) bits/sec/Hz. Therefore, greater capacity loss is experienced in MIMO-multiplexing relaying involving high order MIMO systems. We also illustrate that the capacity loss is independent of the OFDM configurations employed; thus network operators could employ higher OFDM configurations to compensate for data rate loss in access services when some of the MIMO-multiplexing links are dedicated to mesh relay. This pioneering analysis provides useful guidelines for network operators planning to employ MIMO-multiplexing option for mesh relay supports.