**On AVCs with Quadratic Constraints**

*Farzin Haddadpour, Mahdi Jafari Siavoshani, Mayank Bakshi, Sidharth Jaggi*

In this work we study an Arbitrarily Varying Channel (AVC) with quadratic power constraints on the transmitter and a so-called "oblivious'' jammer (along with additional AWGN) under a maximum probability of error criterion, and no private randomness between the transmitter and the receiver. This is in contrast to similar AVC models under the average probability of error criterion considered in other works and models wherein common randomness is allowed -- these distinctions are important in some communication scenarios outlined below. We consider the regime where the jammer's power constraint is smaller than the transmitter's power constraint (in the other regime it is known no positive rate is possible). For this regime we show the existence of stochastic codes (with {\it no common randomness} between the transmitter and receiver) that enables reliable communication at the same rate as when the jammer is replaced with AWGN with the same power constraint. This matches known information-theoretic outer bounds. In addition to being a stronger result than that in earlier results (enabling recovery of the results therein), our proof techniques are also somewhat more direct, and hence may be of independent interest.

Resources:

Resources:

(a) F. Haddadpour, M. Jafari Siavoshani, M.Bakshi and S. Jaggi. “On AVCs with Quadratic Constraints”. To appear in Proceedings of the International Symposium on Information Theory 2013.` `

(b) F. Haddadpour, M. Jafari Siavoshani, M.Bakshi and S. Jaggi. “On AVCs with Quadratic Constraints”. arXiv preprint arXiv:1301.6345 [cs.IT]