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In this work, we investigate the Gaussian MIMO bidirectional broadcast wiretap channel, from the vantage point of optimal transmit strategy design, to fulfill a certain secrecy constraint. An achievable secrecy rate region is computed and the gap to the capacity region of the same channel without the secrecy constraint is upper-bounded. Moreover, for the case of single receive antennas at all terminals,...
In this work we provide an information-theoretic analysis of a Gaussian multiple-input multiple-output multiple access channel (MIMO MAC) with imperfect channel knowledge at the receiver. In particular we derive inner and outer bounds for the rate region of the MIMO MAC when the inputs are Gaussian. In the case where the channel knowledge at the receiver is obtained through training signals, we derive...
We address a two-user decentralized interference channel with static non-frequency selective channel gains. Both users are unaware of each other's code-books and there is no central controller to manage the allocation of resources between the two users. As multiuser detection is not possible, the conventional scheme of transmitting a continuous stream of i.i.d. symbols from Gaussian codebooks by each...
The secret-key agreement problem over wiretap channels controlled by a state parameter is studied. The entire state sequence is known (non-causally) to the sender but not to the receiver and the eavesdropper. Upper and lower bounds on the secret-key capacity are established both with and without public discussion. In absence of public-discussion, our lower bound is strictly better than the best known...
The capacity region of Gaussian interference channel in the weak interference regime is an open problem. Recently, Etkin, Tse and Wang derived an outer bound for the two-user Gaussian interference channel and proved that a simple Han-Kobayashi signaling scheme can achieve within one bit of the capacity region for all values of channel parameters. In this paper, we extend their result to the K-user...
In this paper we consider the real, discrete time asymmetric Gaussian parallel relay network, the more realistic model than the symmetric one considered by Schein-Gallagar. We present achievable rates for this network that are superior rates to the Schein-Gallagar rates. The proposed methods are based on the superimposition technique used for the degraded broadcast channel and also cooperation of...
This paper considers the asymptotic behavior of the outage probability of two-source block-fading SISO interference channels (IFC) in the high-SNR regime. As opposed to previous works, we characterize the diversity, i.e., exponent of the outage probability, for asymmetric networks, that is to say, for arbitrary signal and interference levels at the receivers. Our result is not just a simple extension...
The capacity of a discrete-time memoryless Gaussian channel, where the channel state information (CSI) is neither available at the transmitter nor at the receiver, is addressed. A closed form expression of the optimal capacity-achieving input distribution at low signal-to-noise ratio (SNR) is derived, and the exact capacity of a non-coherent Single Input Single Output (SISO) channel is given. The...
We address the capacity of a discrete-time memoryless Gaussian channel, where the channel state information (CSI) is neither available at the transmitter nor at the receiver. The optimal capacity- achieving input distribution at low signal-to-noise ratio (SNR) is precisely characterized, and the exact capacity of a non-coherent channel is derived. The derived relations allow to better understanding...
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