Intelligent Networking Group;
German Research Center for Artificial Intelligence(DFKI);
Kaiserslautern 67663;
Germany;
Department of Electrical and Computer Engineering(EIT);
University of Kaiserslautern;
Kaiserslautern 67663;
Germany;
cooperative communications; Device-to-Device(D2D); Distributed Space-Time Coding(DSTC); outdated chanel stateinformation; opportunistic relaying;