2013/01/31 by Alireza Vahid, Mohammad Ali Maddah-Ali, Amir Salman Avestimehr · 1 citation
Computer Science · Mathematics · #cs.IT #math.IT
paper · pdf · doi:10.1109/tit.2014.2345371
39 pages, two columns, accepted for publication in IEEE Transactions on Information Theory
arxiv created 2014/07/30 · arxiv updated 2016/11/17
To study the effect of lack of up-to-date channel state information at the transmitters (CSIT), we consider two-user binary fading interference channels with Delayed-CSIT. We characterize the capacity region for such channels under homogeneous assumption where channel gains have identical and independent distributions across time and space, eliminating the possibility of exploiting time/space correlation. We introduce and discuss several novel coding opportunities created by outdated CSIT that can enlarge the achievable rate region. The capacity-achieving scheme relies on accurate combination, concatenation, and merging of these opportunities, depending on the channel statistics. The outer-bounds are based on an extremal inequality we develop for a binary broadcast channel with Delayed-CSIT. We further extend the results and characterize the capacity region when output feedback links are available from the receivers to the transmitters in addition to the delayed knowledge of the channel state information. We also discuss the extension of our results to the non-homogeneous setting.