Frequency-Domain Equalization for Orthogonal and Quasi-Orthogonal STBCs over Frequency-Selective Wireless and Power-Line Channels

Authors:
Mohsen Sheikh-Hosseini;Mohammad Molavi-Kakhki;Ghosheh Abed Hodtani
Affiliations:
Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
Venue:
Wireless Personal Communications: An International Journal
Year:
2013

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Abstract

In recent years, combination of single-carrier frequency-domain equalization (SC-FDE) and space-time block coding/code (STBC) techniques to exploit the advantages of both, has received a great attention. In this paper we propose new techniques for combining SC-FDE with orthogonal and Quasi-orthogonal STBCs applicable to any number of transmit antennas. For Quasi-orthogonal STBC we first propose a new structure for codes with four transmit antennas and then extend it to higher numbers. We convert Quasi-orthogonal system to two equivalent orthogonal subsystems and equalize and decode these subsystems based on our proposed procedure for orthogonal codes. Finally, we present our simulation results for different frequency-selective wireless and power-line channels and show that a significant SNR gain is achieved when SC-FDE is combined with diversity techniques.