The Research On Interference Cancellation In Full-Duplex System

With development of our society, communication are playing an increasingly important role in the information age. In this environment, wireless communication has led people to change thinking modes and life styles based on its convenience, and system capacity will reach its limited capacity due to the rising demand. Therefore, we need to research for the new wireless communication technology to enhance the system capacity greatly so as to relieve the shortage of frequency spectrum resources. Full-duplex technology, which can double the system capacity in the wireless communication system, has become one of hot points in current research. This thesis is to research interference cancellation technology in full-duplex wireless system, design a novel full-duplex MIMO system model, analyze the capacity of full-duplex and the algorithms of antenna selection.First of all, this thesis summarizes the operation mode of wireless communication system. Based on the introduction of TDD mode and FDD mode it describes the specific operation mode of full-duplex communication, then elaborates applications of full-duplex communication, and discusses its advantages and potential difficulties in practice at last.The second part is an introduction to the fundamental principle of full-duplex wireless communication. Considering the effect from strong self-interference during the transmission, this thesis analyzes the full-duplex designs and self-interference elimination technology proposed by worldwide researchers, investigates the feature of present mature MIMO technology. With taking full advantage of MIMO, a novel full-duplex MIMO system model is designed and the feasibility of this system is verified in theory.Then, this thesis analyzes the capacity of full-duplex system theoretically. Full-duplex wireless communication can save half of frequency or time resources through the simultaneous transmission. And in the basis of MIMO system capacity research, the calculation methods of full-duplex MIMO system capacity are deduced. Furthermore, after simulating comparison of system capacity between full-complex MIMO system and half-duplex MIMO system while CSI information is available, the advantage of improving capacity in full-duplex technology is verified.The last part is the research about antenna selection in the full-duplex system. Antenna selection can choose the reliable antenna to receive and send message within the MIMO so as to reduce the complexity of system algorithm effectively and save system resources. This thesis introduces factor of interference elimination and analyzes the methods of antenna selection to propose three criterions. After that, this thesis researches antenna selection in low rank channel and verifies its advantages.