Speaker: Dr. Shraga Bross, Bar Ilan University

Title: The Causal Cognitive Interference Channel

Location: Room 001, Binyan Kitot Hashmal, EE, Tel Aviv university

Time: 15:00, May 17, 2010

Abstract:

The (non-causal) cognitive interference channel, studied recently by Liang et. al., is a model for a classical two-user discrete memoryless interference channel, over which two transmitters send a pair of independent messages. It is assumed that the ¯rst message is
shared by both encoders, whereas the second message in known only to Encoder 2 { the cognitive transmitter. Receiver 2 needs to decode both messages, and Receiver 1 should decode only the ¯rst message while Message 2 should be kept as secret as possible from Receiver 1. The level of secrecy is measured as usual by the normalized equivocation rate. For this model the capacity-equivocation region has been derived by Liang et. al.. In this work we dispense of the assumption that Message 1 is shared a-priori by both encoders. Instead, we study two models in which Encoder 2 acquires Message 1 (or part of it) only in a causal manner. The implications of the causality restriction on the coding schemes and corresponding inner and outer bounds on the capacity-equivocation regions are discussed.

Joint work with Yossef Steinberg, and Stephan Tinguely