A Cyclotomic Lattice Based Closed Loop QOSTBC for Four Transmit Antennas 
K. Senthil Kumar1, M. Palanivelan2, M. Sivaram3, P. Shanmugapriya4,V. Bakyalakshmi5
1Dr. M. Palanivelan, Professor & Head, Department of ECE, Rajalakshmi Engineering College, Chennai (Tamil Nadu), India.
2K. Senthil Kumar, Associate Professor, Department of ECE, Rajalakshmi Engineering College, Chennai (Tamil Nadu), India.
3V. Bakyalakshmi, Assistant Professor, Department of ECE, Rajalakshmi Engineering College, Chennai (Tamil Nadu), India.
4M. Sivaram, Department of ECE, Rajalakshmi Engineering College, Chennai (Tamil Nadu), India.
5P. Shanmugapriya, Department of ECE, Rajalakshmi Engineering College, Chennai (Tamil Nadu), India.
Manuscript received on 25 August 2019 | Revised Manuscript received on 01 September 2019 | Manuscript Published on 14 September 2019 | PP: 167-171 | Volume-8 Issue-5S3, July 2019 | Retrieval Number: E10400785S319/19©BEIESP | DOI: 10.35940/ijeat.E1040.0785S319
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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: Drawback of the Space Time Block Code (STBC) is, for complex constellations, full rate and full diversity design exist only for two transmit antennas. In this paper, we propose a novel closed loop Quasi Orthogonal Space Time Block Code (QOSTBC) system based on cyclotomic lattices for four transmit antennas. It is a full rate and full diversity design where the information bits are mapped into four dimensional (4-D) lattice points. The bit error and symbol error performance of the system are evaluated by simulation.
Keywords: MIMO, QOSTBC, Cyclotomic, Lattice, Diversity Product.
Scope of the Article: Microwave Antenna