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Directional signal modulation by means of switched spaced antennas

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1 Author(s)
Baghdady, Elie J. ; EJB Res. Associates, Weston, MA, USA

The theory of modulation by hopping or by commutation among a number of spaced antennas is presented. The theory brings out the important considerations and criteria for determining the separation of discrete antennas in time and/or space that produces a desired modulation. In addition, antenna hopping and commutation are proposed for generating direction-dependent spread spectrum to enhance receiving system anti-interference processing gain and/or transmitted signal camouflage and LPI, as well as to provide an effective means for channel monitoring and analytical probing

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Communications, IEEE Transactions on  (Volume:38 ,  Issue: 4 )