Spectrum Efficiency for Spatially Correlated MIMO OSFBC-OFDM Systems over Various Adaptation Policies
Ch. Siva Rama Krishna1, Vidhyacharan Bhaskar2
1Ch. Siva Rama Krishna, working as an Assistant Professor in the Department of Electronics and Communication Engineering at SVIST Engineering College, Tiruvuru, India.
2Vidhyacharan Bhaskar, Professor in the Department of Electronics and Communication Engineering at S.R.M. University, Kattankulathur, India.
Manuscript received on July 01, 2012. | Revised Manuscript received on July 04, 2012. | Manuscript published on July 05, 2012. | PP: 81-85 | Volume-2, Issue-3, July 2012. | Retrieval Number: C0700052312 /2012©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: In this paper, closed-form expressions for capacities per unit bandwidth for spatially correlated multiuser MIMO-OFDM systems employing Orthogonal Space-Frequency Block Coding (OSFBC) over multipath frequency-selective fading channels are derived for optimal power and rate adaptation, optimal rate adaptation with constant transmit power, channel inversion with fixed rate, and truncated channel inversion adaptation polices. A Signal to Noise Ratio (SNR) based user selection scheme is considered. Closed-form expressions are derived for spatially correlated OSFBC-OFDM system. Optimal power adaptation policy provides the highest capacity over the other adaptation policies. Capacity gains are more prominent for optimal rate adaptation with constant transmit power policy as compared to other adaptation policies.
Keywords: Orthogonal space-frequency block coding; optimal power adaptation; optimal rate adaptation with constant transmit power; channel inversion with fixed rate; truncated channel inversion; outage probability.