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http://dx.doi.org/10.6109/jkiice.2015.19.8.1785

Interference Alignment in 2-user X Channel System with Orthogonal and quasi-orthogonal Space-time Block Codes  

Mohaisen, Islam (Department of Electrical Engineering, Islamic University of Gaza)
Lee, Saet-byeol (Department of EEC, Korea University of Technology and Education)
Mohaisen, Manar (Department of EEC, Korea University of Technology and Education)
Elaydi, Hatem (Department of Electrical Engineering, Islamic University of Gaza)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.19, no.8, 2015 , pp. 1785-1796 More about this Journal
Abstract
In this paper, we investigate achieving the full diversity order and power gains in case of using OSTBCs and quasi-OSBCs in the x channel system with interference alignment with more than 2 antennas at each terminal. A slight degradation is remarked in the case of quasi-OSTBCs. In terms of receiver structure, we show that due to the favorable structure of the channel matrices, the simple zero-forcing receiver achieves the full diversity order, while the interference cancellation receiver leads to degradations in performance. As compared to the conventional scheme, simulation results demonstrate that our proposed schemes achieve 14dB and 16.5dB of gain at a target bit error rate (BER) of 10-4 in the case of OSTBCs with 3 and 4 antennas at each terminal, respectively, while achieving the same spectral efficiency. Also, a gain of 10dB is achieved at the same target BER in the case of quasi-OSTBC with 4 antennas at each terminal.
Keywords
Interference alignment; x channel; MIMO detection; orthogonal STBC; quasi-orthogonal STBC;
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