In this contribution, we propose a multiport compact antenna that supports four radiating modes operating at the same frequency thus making it a suitable candidate to substitute a linear array of four antennas. It will be also shown as this antenna produces dynamic directional modulation (DDM) with low bit error rate (BER) in a unique, unambiguous (secure) angular region that can be chosen freely in the XY plane. Trade-offs between the BER beam width of the secure angular region, the BER at side lobes and the extra power required in the generation of DDM are assessed through measurements with real-time data transmission.
Dynamic directional modulation (DDM) has already proven to be an efficient technique to achieve physical layer security in wireless communications. System architectures based on vector modulators provide a flexible framework to implement synthesis methods that allow us to obtain increased security and/or independent multichannel transmissions. However, the implementation of DDM with vector modulators requires an accurate calibration (amplitude and phase) of every component in the RF path. In this contribution, we study the sensitivity of the response of a DDM system based on commercial vector modulators showing how to correct the nonideal behavior of all the components thanks to the flexibility provided by the vector modulator.
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