On Improving the Tradeoff between Symbol Rate and Diversity Gain Using Quasi-Orthogonal Space-Time Block Codes with Linear Receivers

Kazuyuki MORIOKA  David ASANO  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.12   pp.3763-3767
Publication Date: 2012/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.3763
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Coding and Coding Theory-Based Signal Processing for Wireless Communications)
Orthgonal Space-Time Block Codes,  Quasi-Orthgonal Space-Time Block Codes,  Group Orthgonal-Toeplitz Codes,  

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In this letter, the tradeoff between symbol rate and diversity gain of Space-Time Block Codes (STBCs) with linear receivers is considered. It is known that Group Orthogonal-Toeplitz Codes (GOTCs) can achieve a good tradeoff with linear receivers. However, the symbol rate of GOTCs is limited to that of the base Orthogonal Space-Time Block Codes (OSTBCs). We propose to simply change the GOTC base codes from OSTBCs to Quasi-Orthogonal Space-Time Block Codes (Q-OSTBCs). Q-OSTBCs can improve the symbol rate of GOTCs at the expense of diversity gain. Simulation results show that Q-OSTBC based GOTCs can improve the tradeoff between symbol rate and diversity gain over that of the original GOTCs.