Resource Allocation For Full-duplex Based Relaying Networks

With the development of wireless communication techniques,spectrum resource is becoming increasingly scarce. The lack of spectrum resources has become one of the bottlenecks in the development of wireless communication. Hence, how to use the resource more effectively is a technical problem necessary to be solved urgently. Compared with half-duplex which can only transmit or receive signals in a time slot, the full-duplex, able to transmit and receive signals at the same time, is more spectrum efficient. Two-way relaying, enabled by network coding techniques, also improves spectrum efficiency when compared with the traditional one-way relaying. Multicarrier is an important technology which can improve spectrum efficiency. What's more, cognitive radio is another new communication paradigm to improve spectrum utilization.Therefore, combining the aforementioned techniques has the potential to fully exploit their benefits to further improve spectrum efficiency. This thesis studies the resource allocation for full-duplex based relaying networks, main work can be summarized as follows:Relay power control for a full-duplex based two-way relaying network is studied in the thesis. A classic three-node relaying network is considered. Different relay power control schemes are proposed to satisfy different system objectives. Simulation results are provided to verify the performance of the proposed schemes.Resource allocation for a multicarrier full-duplex based relaying network is studied. A joint power allocation and subcarrier permutation problem is proposed in the one-way relaying network. The problem is transformed and then solved by a proposed iterative algorithm. At last,numerical experiments are provided to verify the convergence of the proposed iterative algorithm and performance of the proposed resource allocation method.Combining the advantages of full-duplex based relay and cognitive networks, the thesis studies spectrum sharing for a full-duplex based cognitive relaying network. A two-way full-duplex based cognitive relaying network is considered, where the secondary node can operate assistant transmission and cognitive transmission. A spectrum sharing mechanism for the primary system and secondary system is proposed.What's more, the thesis makes analysis in terms of outage probabilities of primary system and secondary system. At last, performance of the proposed spectrum sharing mechanism and the validity of the conclusion are verified by numerical simulations.Spectrum sharing and resource allocation for a cognitive full-duplex multicarrier relaying are studied in the thesis. A cognitive radio network is investigated, in which OFDM-based two-way relaying is used. A joint spectrum partition, subcarrier perputation, and power allocation problem is proposed. We develop an asymptotically optimal solution in dual domain with polynoimal complexity to slove this problem effectively; in particular,a variant version of classic Hungarian method is proposed to jointly solve the spectrum partition and subcarrier perputation problem. Performance of the proposed algorithm is evaluated by numerical simulations and comparisons.