Performance Analysis And Resource Allocation Techniques Of Full-Duplex Relay

Next generation mobile communication networks are facing the demand of higher spectral efficiency and capacity. As it has been necessary to upgrade the architecture of cellular network, the wireless relay technology which can improve the capacity and increase the coverage of cell becomes one of the key technologies for next generation mobile communications. Most of the traditional relay operates in half-duplex mode where a time slot is divided into two or more slots for receiving or transmitting, bringing the losses of spectral and time resources. However, the full-duplex wireless relay works in the same frequency at the same time so as to avoid the loss of spectrum resources, but meanwhile inevitably brings about self-interference problems. And it is full of challenges that the self-interference cannot be completely eliminated through self-interference cancellation technologies.As new problems about interference and link resource allocation for wireless relay system come out with full-duplex relay nodes, the studies on performance and resource allocation techniques have become significant. And this dissertation is focused on the theoretical performance analysis and resource allocation techniques of full-duplex wireless relaying networks, and the possible researches in the future are discussed. In particular, the detail work and main contribution of this paper are as follows:1、The properties of full-duplex relaying and self-interference are introduced, and the characteristics of key self-interference cancellation methods are summarized. As the self-interference is still not completely eliminated via self-interference cancellation technologies, the paper focuses on the reasonable modeling of residual self-interference, and three different models are proposed and analyzed.2、The theoretical performance of full-duplex relay networks are analyzed. The ergodic capacity and outage probability in full-duplex relay networks are derived, and the effects of self-interference and channel conditions on the performance are discussed. Simulation results show that the full-duplex relay networks have a better performance within a certain range of self-interference, compared with the half-duplex wireless relay network.3、The resource allocation techniques in full-duplex relay network with imperfect channel estimates and residual self-interference are discussed. With rational assumption of channel estimation and residual self-interference, the optimization problem for maximizing the ergodic capacity are proposed considering the restraint of power resource in full-duplex cooperative relay network. Then, different optimal algorithms about power allocation and relay selection are proposed for single-relay and multi-relay networks. And the effects of the location and number of relays, and the different channel estimation models are taken into consideration of the performance of full-duplex relaying network. Simulation results show that the proposed optimization schemes have significant performance gain.