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The question of robust direct communication in vehicular networks isdiscussed. In most state-of-the-art approaches, there is no central entitycontrolling channel access, so there may be arbitrary interference from otherparties. Thus, a suitable channel model for Vehicle-to-X (V2X) communication isthe Arbitrarily Varying Channel (AVC). Employing multiple antennas on a vehicleor sending over multiple frequencies to make use of diversity are promisingapproaches to combat interference. In this setup, an important question aboutdiversity is how many antennas or orthogonal carrier frequencies are necessaryin order to avoid system breakdown due to unknown interference in AVCs. ForBinary Symmetric AVCs (AVBSC) and a physically meaningful identicalstate-constrained jammer, the deployment of a third, uncorrelated receivingantenna or the parallel transmission over three different orthogonalfrequencies avoids symmetrizability and thus ensures positivity of the capacityof the overall communication channel. Furthermore, the capacity of theidentical state-constrained composite AVBSC is continuous and showssuper-activation, a phenomenon which was hitherto deemed impossible forclassical communication without secrecy constraints. Subsuming, spatial andfrequency diversity are enablers for reliable communication over communicationchannels with arbitrarily varying interference.

Reliable Communication under the Influence of a State-Constrained Jammer: A Novel Perspective on Receive Diversity