Demonstration of directional modulation using a phased array

Michael P. Daly, Erica Lynn Daly, Jennifer T. Bernhard

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article number5422702
Pages (from-to)1545-1550
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Issue number5
StatePublished - May 2010


  • Directional modulation
  • Phase-shift Keying (PSK)
  • Phased array
  • Secure communication

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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