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Mathematical Problems in Engineering
Volume 2018, Article ID 2179617, 7 pages
https://doi.org/10.1155/2018/2179617
Research Article

A Spectrum Efficient Secure Transmission Scheme Based on Directional Polarization Modulation for Wireless Communication Systems

Science and Technology on Complex Electronic System Simulation Laboratory, Space Engineering University, Beijing 101400, China

Correspondence should be addressed to Zhangkai Luo; moc.qq@5198110441

Received 15 October 2018; Accepted 11 November 2018; Published 26 November 2018

Academic Editor: Francesca Vipiana

Copyright © 2018 Zhongmin Pei et al. 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

In this paper, a spectrum efficient secure transmission scheme based on directional polarization modulation (DPM) is proposed. Specifically, the polarized signals are divided into two parts, i.e., I and Q, and a dual-polarized antenna array is designed to form beams to transmit these signals. Naturally, the constellation structure is associated with the beam gain, which can be controlled to make the constellation structure distort in undesired directions. Thus the security is enhanced for the symbol error rate performance deteriorates in undesired directions. Additionally, a kind of directional modulation technique is utilized to transform one component of the polarized signal into QPSK signal and thus improves the modulation order without extra transmitting power consummation. Finally, theoretical analysis and simulation results demonstrate that the proposed scheme can improve the transmission efficiency and provide a security transmission method for wireless communication systems.