New Capacity Upper Bounds For Binary Deletion Channel

Abstract: This paper considers a binary channel with deletions. We derive two close form upper bound on the capacity of binary deletion channel. The first upper bound is based on computing the capacity of an auxiliary channel and we show how the capacity of auxiliary channel is the upper bound of the binary deletion channel. Our main idea for the second bound is based on computing the mutual information between the sent bits and the received bits in binary deletion channel. We approximate the exact mutual information and we give a close form expression. All bounds utilize first-order Markov process for the channel input. The second proposed upper bound improves the best upper bound [6,11] up to 0.1.