Research On Performance Of Full-Duplex Wireless Networks

The two typical duplex schemes in wireless communication are Frequency Division Duplex and Time Division Duplex. By FDD mode, frequencies used by nodes to transmit downlink signals and uplink signals are different. By TDD mode, frequencies used by nodes to transmit downlink signals and uplink signals are same, while timeslot is different. Hence, the two kinds of duplex mode above cannot make full use of channel resources. Full-duplex on the same frequency at the same time (FD-SFST) can improve spectrum efficiency effectively. Many scholars have studied the ways to achieve FD-SFST already, and have made a series of achievements. This thesis focuses on wireless communication networks, and the main contribution is to research the performance of wireless networks based on FD-SFST.Firstly, considering the residual self-interference, the performances of FD-SFST wireless relay networks, including one-way relay network with buffer-aided and two-way relay network based on multi-carrier are investigated. To evaluate the performance of one-way relay network with buffer-aided, Average throughput of FD-SFST relay network with buffer-aided was studied and optimized transmission scheme was proposed in order to improve network performance. To optimize the performance of two-way relay network based on multi-carrier, SINR of each user in the FD-SFST multi-carrier multi-user relay network was analyzed, and with limited carrier number and power, an optimal resource allocation scheme and power allocation scheme to maximize network capacity was given, and simulation demonstrates its performance improvement on network capacity.Secondly, the performance of FD-SFST WLAN network was studied. A new MAC protocol was presented to save energy compared with traditional FD MAC, and a new channel contention mechanism called CSMA/CC was proposed to improve network performance compared with CSMA/CA. System-level simulation results reveal the effectiveness of both of the two schemes.