Optimal Power Scaling for Quasi-Orthogonal Space-Time Block Codes with Power Scaling and Square Lattice Constellations

Hoojin LEE  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.9   pp.2660-2662
Publication Date: 2011/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2660
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
transmit diversity,  multiple-input multiple-output (MIMO),  quasi-orthogonal space-time block code (QSTBC),  

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Recently proposed full-rate quasi-orthogonal space-time block codes (QSTBCs) with power scaling is able to achieve full-diversity through linearly combining two adequately power scaled orthogonal space-time block codes (OSTBCs). While in our initial work we numerically derived the optimal value of the power scaling factor to achieve full-diversity, our goal in this letter is to analytically derive the optimal power scaling, especially for square lattice constellations (e.g., 4-QAM, 16-QAM, etc.) by maximizing the coding gain.