Cloud Compute-and-Forward With Relay Cooperation
Koralia N. Pappi, Panagiotis D. Diamantoulakis, Hadi Otrok, George K. Karagiannidis · 2015
We study a cloud network with M distributed receiving antennas and L users, which transmit their messages towards a centralized decoder (CD), whereM ≥ L. We consider that the cloud network applies the Compute-and-Forward (C&F) protocol, where L antennas/relays are selected to decode integer equations of the transmitted messages. In this work, we focus on the best relay selection and the optimization of the Physical-Layer Network Coding (PNC) at the relays, aiming at the throughput maximization of the network. Existing literature optimizes PNC with respect to the maximization of the minimum rate among users. The proposed strategy maximizes the sum rate of the users allowing non-symmetric rates, while the optimal solution is explored with the aid of the Pareto frontier. The problem of relay selection is matched to a coalition formation game, where the relays and the CD cooperate to maximize their profit. Efficient