Table of Contents
ISRN Communications and Networking
Volume 2011, Article ID 157927, 6 pages
http://dx.doi.org/10.5402/2011/157927
Research Article

Quasi-Orthogonal Space-Time Block Coding Using Polynomial Phase Modulation

Department of Electrical and Computer Engineering, Florida International University, 10555 West Flagler Street, Miami, FL 33174, USA

Received 8 March 2011; Accepted 28 April 2011

Academic Editors: A. Maaref, S. S. Pietrobon, and A. Vaccaro

Copyright © 2011 Omar Granados and Jean Andrian. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Recently, polynomial phase modulation (PPM) was shown to be a power- and bandwidth-efficient modulation format. These two characteristics are in high demand nowadays specially in mobile applications, where devices with size, weight, and power (SWaP) constraints are common. In this paper, we propose implementing a full-diversity quasiorthogonal space-time block code (QOSTBC) using polynomial phase signals as modulation format. QOSTBCs along with PPM are used in order to improve the power efficiency of communication systems with four transmit antennas. We obtain the optimal PPM constellations that ensure full diversity and maximize the QOSTBC's minimum coding gain distance. Simulation results show that by using QOSTBCs along with a properly selected PPM constellation, full diversity in flat fading channels and thus low BER at high signal-to-noise ratios (SNR) can be ensured. More importantly, it is also shown that QOSTBCs using PPM achieve a better error performance than those using conventional modulation formats.