Spectrum Efficiency for Rate-Adaptive MIMO OSFBC-OFDM Systems over Various Adaptation Policies
CH. Siva Rama Krishna1, P. Venkateswara Rao2
1Siva Rama Krishna, B.TECH, Degree, Department of Electronics and Communication Engineering, Mother Teresa Institute of Science & Technology, JNTUH University, Kakinada (Andhra Pradesh), India.
2Venkateswara Rao P, B.TECH, Degree, Department of Electronics and Communication Engineering, Sri Sarathi Institute of Engineering& Technology, JNTUK University, Kakinada (Andhra Pradesh), India.
Manuscript received on 11 June 2013 | Revised Manuscript received on 17 June 2013 | Manuscript Published on 30 June 2013 | PP: 99-103 | Volume-3 Issue-1, June 2013 | Retrieval Number: A0915063113/13©BEIESP
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© The Authors. 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 multiuser MIMO-OFDM systems employing Orthogonal Space-Frequency Block Coding (OSFBC) over multipath frequency-selective fading channels are derived for optimal power 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 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.
Scope of the Article: Expert Systems