Distance based selection for user-relaying in OFDMA-based wireless networks

OFDMA-based user-relay assisted wireless networks which have lower infrastructure cost and larger coverage areas are important technologies for the next generation communication systems since they allow to communicate at higher data rates. The performance of the system is increased with user-relaying since the number of user-relays scales with the number of mobile users. Although, it is good to assume all mobile users are the user-relay candidates, it is not suitable for the practical systems because of the rising signalling overhead and complexity. Thus, in this study, the user-relay candidates are selected in a limited area based on a distance parameter in order to balance the trade-off between the system performance and the signalling overhead and the results are evaluated by performing simulations.