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A review of directional modulation technology

  • Yuan Ding (a1) and Vincent Fusco (a1)

Directional modulation (DM) is an emerging technology for securing wireless communications at the physical layer. This promising technology, unlike the conventional key-based cryptographic methods and the key-based physical layer security approaches, locks information signals without any requirements of keys. The locked information can only be fully recovered by the legitimate receiver(s) priory known by DM transmitters. This paper reviews the origin of the DM concept and, particularly, its development in recent years, including its mathematical model, assessment metrics, synthesis approaches, physical realizations, and finally its potential aspects for future studies.

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Corresponding author: Y. Ding Email:
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[1] Li, X.; Hwu, J.; Ratazzi, E.P.: Using antenna array redundancy and channel diversity for secure wireless transmissions. J. Commun., 2 (3) (2007), 2432.
[2] Mollin, R.A.: An Introduction to Cryptography, CRC Press, Boca Raton, FL, 2006.
[3] William, S.: Cryptography and Network Security, 4th ed., Pearson Education India, Upper Saddle River, NJ, 2006.
[4] Forouzan, B.A.: Cryptography and Network Security, McGraw-Hill, New York, NY, 2007.
[5] Bloch, M.; Barros, J.: Physical-Layer Security: From Information Theory to Security Engineering, Cambridge University Press, Cambridge, 2011.
[6] Wang, T.; Liu, Y.; Vasilakos, A.: Survey on channel reciprocity based key establishment techniques for wireless systems. Wireless Netw., 2015, available at:
[7] Chen, C.; Jensen, M.A.: Secret key establishment using temporally and spatially correlated wireless channel coefficients. IEEE Trans. Mob. Comput., 10 (2011), 205215.
[8] Ahmadi, H.; Safavi-Naini, R.: Secret key establishment over a pair of independent broadcast channels, in 2010 Int. Symp. Information Theory and Its Applications (ISITA), 2010, 185190.
[9] Mukherjee, A.; Fakoorian, S.A.A.; Huang, J.; Swindlehurst, A.L.: Principles of physical layer security in multiuser wireless networks: a survey. IEEE Commun. Surveys Tuts., 16 (3) (2014), 15501573.
[10] Ding, Y.; Fusco, V.: Vector representation of directional modulation transmitters, in 2014 8th European Conf. Antennas and Propagation (EuCAP), 2014, 332336.
[11] Ding, Y.; Fusco, V.: A vector approach for the analysis and synthesis of directional modulation transmitters. IEEE Trans. Antennas Propag., 62 (2014), 361370.
[12] Ding, Y.; Fusco, V.: Establishing metrics for assessing the performance of directional modulation systems. IEEE Trans. Antennas Propag., 62 (2014), 27452755.
[13] Ding, Y.; Fusco, V.: BER-driven synthesis for directional modulation secured wireless communication. Int. J. Microw. Wireless Technol., 6 (2014), 139149.
[14] Ding, Y.; Fusco, V.: Directional modulation transmitter radiation pattern considerations. IET Microw. Antennas Propag., 7 (15) (2013), 12011206.
[15] Ding, Y.; Fusco, V.: Constraining directional modulation transmitter radiation patterns. IET Microw. Antennas Propag., 8 (15) (2014), 14081415.
[16] Ding, Y.; Fusco, V.: Directional modulation far-field pattern separation synthesis approach. IET Microw. Antennas Propag., 9 (1) (2015), 4148.
[17] Zhang, Y.; Ding, Y.; Fusco, V.: Sidelobe modulation scrambling transmitter using Fourier Rotman lens. IEEE Trans. Antennas Propag., 61 (2013), 39003904.
[18] Shi, H.; Tennant, A.: Secure physical-layer communication based on directly modulated antenna arrays, in 2012 Loughborough Antennas and Propagation Conf. (LAPC), 2012, 14.
[19] Shi, H.; Tennant, A.: Enhancing the security of communication via directly modulated antenna arrays. IET Microw. Antennas Propag., 7 (8) (2013), 606611.
[20] Babakhani, A.; Rutledge, D.B.; Hajimiri, A.: Transmitter architectures based on near-field direct antenna modulation. IEEE J. Solid-State Circuits, 43 (2008), 26742692.
[21] Babakhani, A.; Rutledge, D.B.; Hajimiri, A.: Near-field direct antenna modulation. IEEE Microw. Mag., 10 (2009), 3646.
[22] Chang, A.H.; Babakhani, A.; Hajimiri, A.: Near-field direct antenna modulation (NFDAM) transmitter at 2.4 GHz, in 2009 IEEE Antennas and Propagation Society Int. Symp., 2009, 14.
[23] Shi, H.; Tennant, A.: Direction dependent antenna modulation using a two element array, in Proc. 2011 5th European Conf. Antennas and Propagation (EuCAP), 2011, 812815.
[24] Shi, H.; Tennant, A.: Characteristics of a two element direction dependent antenna array, in 2011 Loughborough Antennas and Propagation Conf. (LAPC), 2011, 14.
[25] Shi, H.; Tennant, A.: An experimental two element array configured for directional antenna modulation, in Proc. 2012 6th European Conf. Antennas and Propagation (EuCAP), 2012, 16241626.
[26] Daly, M.P.; Bernhard, J.T.: Directional modulation technique for phased arrays. IEEE Trans. Antennas Propag., 57 (2009), 26332640.
[27] Daly, M.P.; Bernhard, J.T.: Beamsteering in pattern reconfigurable arrays using directional modulation. IEEE Trans. Antennas Propag., 58 (2010), 22592265.
[28] Daly, M.P.; Daly, E.L.; Bernhard, J.T.: Demonstration of directional modulation using a phased array. IEEE Trans. Antennas Propag., 58 (2010), 15451550.
[29] Daly, M.P.: 2012: Physical layer encryption using fixed and reconfigurable antennas. Ph.D. dissertation, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Champaign, IL.
[30] Shi, H.; Tennant, A.: Secure communications based on directly modulated antenna arrays combined with multi-path, in 2013 Loughborough Antennas and Propagation Conf. (LAPC), 2013, 582586.
[31] Shi, H.; Tennant, A.: Covert communication using a directly modulated array transmitter, in 2001 Proc. 8th European Conf. Antennas and Propagation (EuCAP), 2014, 316318.
[32] Shi, H.; Tennant, A.: Simultaneous, multi-channel, spatially directive data transmission using direct antenna modulation. IEEE Trans. Antennas Propag., 62 (1) (2014), 403410.
[33] Hong, T.; Song, M.Z.; Liu, Y.: Dual-beam directional modulation technique for physical-layer secure communication. IEEE Antennas Wireless Propag. Lett., 10 (2011), 14171420.
[34] Valliappan, N.; Lozano, A.; Heath, R.W.: Antenna subset modulation for secure millimeter-wave wireless communication. IEEE Trans. Commun., 61 (8) (2013), 32313245.
[35] Zhu, Q.; Yang, S.; Yao, R.; Nie, Z.: A directional modulation technique for secure communication based on 4D antenna arrays, in Proc. 7th European Conf. Antennas and Propagation (EuCAP), 2013, 125127.
[36] Zhu, Q.; Yang, S.; Yao, R.; Nie, Z.: Directional modulation based on 4-D antenna arrays. IEEE Trans. Antennas Propag., 62 (2) (2014), 621628.
[37] Hong, T.; Song, M.Z.; Liu, Y.: RF directional modulation technique using a switched antenna array for physical layer secure communication applications. Prog. Electromagn. Res., 116 (2011), 363379.
[38] Csiszar, I.; Korner, J.: Broadcast channels with confidential messages. IEEE Trans. Inf. Theory, 24 (1978), 339348.
[39] McIllree, P.E.: Channel capacity calculations for M-ary N-dimensional signal sets. M.E. thesis in Electronic Engineering, The University of South Australia, 1995.
[40] Stroud, A.H.: Approximate Calculation of Multiple Integrals, Prentice-Hall, Englewood Cliffs, NJ, 1971, 2352.
[41] Brink, S.T.: Convergence behavior of iteratively decoded parallel concatenated codes. IEEE Trans. Commun., 49 (10) (2001), 17271737.
[42] Lavaei, J.; Babakhani, A.; Hajimiri, A.; Doyle, J.C.: A study of near-field direct antenna modulation systems using convex optimization, in American Control Conf. (ACC), 2010, 10651072.
[43] Ding, Y.; Fusco, V.: Experiment of digital directional modulation transmitters. Forum for Electromagnetic Research Methods and Application Technologies (FERMAT), 11 (2015).
[44] WARP Project. Available at: (accessed 14 June 2014).
[45] Ding, Y.; Zhang, Y.; Fusco, V.: Fourier Rotman lens enabled directional modulation transmitter. Int. J. Antennas Propag., 2015, 13 pages, 2015, Article ID 285986. doi:10.1155/2015/285986.
[46]Fourier Rotman lens directional modulation demonstrator experiment. Available at:
[47] Ding, Y.; Fusco, V.: Improved physical layer secure wireless communications using a directional modulation enhanced retrodirective array, in 2014 XXXIst URSI General Assembly and Scientific Symp. (GASS), 2014, doi: 10.1109/URSIGASS.2014.6929294.
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International Journal of Microwave and Wireless Technologies
  • ISSN: 1759-0787
  • EISSN: 1759-0795
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