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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 285986, 13 pages
http://dx.doi.org/10.1155/2015/285986
Research Article

Fourier Rotman Lens Enabled Directional Modulation Transmitter

1The Institute of Electronics, Communications and Information Technology (ECIT), Queen’s University of Belfast, Belfast BT3 9DT, UK
2The School of Electronic Information, Wuhan University, Wuhan 430072, China

Received 26 November 2014; Accepted 1 March 2015

Academic Editor: Giampiero Lovat

Copyright © 2015 Yuan Ding 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

A 10 GHz Fourier Rotman lens enabled dynamic directional modulation (DM) transmitter is experimentally evaluated. Bit error rate (BER) performance is obtained via real-time data transmission. It is shown that Fourier Rotman DM functionality enhances system security performance in terms of narrower decodable low BER region and higher BER values associated with BER sidelobes especially under high signal to noise ratio (SNR) scenarios. This enhancement is achieved by controlled corruption of constellation diagrams in IQ space by orthogonal injection of interference. Furthermore, the paper gives the first report of a functional dual-beam DM transmitter, which has the capability of simultaneously projecting two independent data streams into two different spatial directions while simultaneously scrambling the information signals along all other directions.