2015/10/22 by Diana Maamari, Maamari, Diana, Daniela Tuninetti +3
Computer Science · Engineering · #Cognitive Radio Networks and Spectrum Sensing #Cooperative Communication and Network Coding #FOS: Computer and information sciences #Information Theory (cs.IT) #Wireless Communication Security Techniques
paper · pdf · doi:10.48550/arxiv.1510.06804
openalex publication_date 2015/10/22 · openalex created_date 2022/10/04 · openalex updated_date 2026/07/28
This paper provides a survey of the state-of-the-art information theoretic\nanalysis for overlay multi-user (more than two pairs) cognitive networks and\nreports new capacity results. In an overlay scenario, cognitive / secondary\nusers share the same frequency band with licensed / primary users to\nefficiently exploit the spectrum. They do so without degrading the performance\nof the incumbent users, and may possibly even aid in transmitting their\nmessages as cognitive users are assumed to possess the message(s) of primary\nuser(s) and possibly other cognitive user(s). The survey begins with a short\noverview of the two-user overlay cognitive interference channel. The evolution\nfrom two-user to three-user overlay cognitive interference channels is\ndescribed next, followed by generalizations to multi-user (arbitrary number of\nusers) cognitive networks. The rest of the paper considers K-user cognitive\ninterference channels with different message knowledge structures at the\ntransmitters. Novel capacity inner and outer bounds are proposed. Channel\nconditions under which the bounds meet, thus characterizing the information\ntheoretic capacity of the channel, for both Linear Deterministic and Gaussian\nchannel models, are derived. The results show that for certain channel\nconditions distributed cognition, or having a cumulative message knowledge\nstructure at the nodes, may not be worth the overhead as (approximately) the\nsame capacity can be achieved by having only one global cognitive user whose\nrole is to manage all the interference in the network. The paper concludes with\nfuture research directions.\n