Demonstration of Directional Modulation Using a Phased Array

A four-symbol modulation is created by repeated switching of phase shifters in a phased array, in a technique known as directional modulation (DM). The phase shifts are chosen to minimize the bit error rate (BER) in a line-of-sight channel in a desired direction while maximizing the BER elsewhere. A...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2010-05, Vol.58 (5), p.1545-1550
Main Authors: Daly, Michael P, Daly, Erica Lynn, Bernhard, Jennifer T
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Baseband
Channels
Delta modulation
Digital modulation
Directional modulation
Exact sciences and technology
Microstrip antenna arrays
Modulation
Phase modulation
Phase shifters
Phase-shift Keying (PSK)
phased array
Phased arrays
Radiocommunications
RF signals
Secret
secure communication
Sidelobes
Signal synthesis
Switching
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Transmitters
Transmitters. Receivers
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Summary:A four-symbol modulation is created by repeated switching of phase shifters in a phased array, in a technique known as directional modulation (DM). The phase shifts are chosen to minimize the bit error rate (BER) in a line-of-sight channel in a desired direction while maximizing the BER elsewhere. A DM transmitter is demonstrated in an anechoic chamber, and results are compared with a traditional baseband QPSK modulation using the same phased array. Experiments indicate that the DM transmitter creates a narrower region of low BERs around the desired direction than the traditional phased array while maintaining high BERs in the sidelobe regions.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2010.2044357