چكيده به لاتين
Abstract:
The increasing demand for high-speed wireless services in recent years has led to advent of new technologies to improve data rate and coverage area. Among these technologies, in-band full-duplex (FD) systems and cooperative communications based on different relaying methods have attracted lots of interests. In FD systems, wireless terminals can transmit and receive signals at the same time and same frequency band with negligible self-interference (SI) thanks to appropriate SI mitigation methods. Hence, spectral efficiency (SE) achieved in FD systems may become as twice as in half-duplex (HF) ones.
In this thesis, we develop a resource allocation algorithm for uplink of in-band full-duplex (FD) cellular networks. The FD cellular network is assumed to be based on orthogonal frequency division multiple access (OFDMA) and consists of a base station communicating with multiple users. Some of the users in the network act as relay for other users and help them to transmit their data to the base station. These relays are FD and work based on amplify and forward (AF) protocol. By appropriate selection of the relays and optimized allocation of subcarriers and powers to all users, we try to maximize the total sum rate of the network. During this optimization, we also impose some constraints on the users' quality of service (QoS) and power. We propose a new algorithm to select the best relays based on the users' maximum data rate and distances. Also we propose Munkres algorithm for subcarrier assignment. It is proved that the resulting optimization problem can be converted to a convex problem, and hence it can be solved by standard numerical methods. The simulation results demonstrate the effect of our proposed scheme on the sum rate and coverage of the network.
Keywords: In-Band Full-Duplex, OFDMA, QoS, Relay Selection, Uplink resource allocation
