Biography
Enrollment Date: 2010
Graduation Date：2013
Degree：M.S.
Defense Date：2013.05.28
Advisors：Chun Zhang
Department：Institute of Microelectronics，Tsinghua University
Title of Dissertation/Thesis：The Design of Single Channel Full Duplex Communication Protocol
Abstract:
Single Channel Full Duplex Wireless Communication enabled a transceiver to transmit and receive on the same frequency at the same time. We can implement a Single Channel Full Duplex Wireless System by subtracting the interference signal from the leakage of transmit antenna to the receive link and demodulate the intended receive signal correctly. In theory, regardless of Frequency Division Duplexing or Time Division Duplexing adopted by current wireless communication system and without exploit new spectrum resources, the communication capacity can be doubled if we add Single Channel Full Duplex technology to the current wireless communication system. This technology has a promising application prospects in Wireless Sensor Network, by solving many problems in current wireless communication mechanism.
Single Channel Full Duplex Communication may become the main communication technology in the future, and at least it can be widely used in the dedicated field. Now Single Channel Full Duplex Communication research is still in the early stages and only a small number of foreign research institutions engaged in research in this area. They have made some of the research results of the laboratory level in the past two years, but the Single Channel Full Duplex technology is not mature enough. Therefore, it is important to carry out the research and design of Single Channel Full Duplex Communication early, in order to keep up with the pace of communications technology in the future and develop new efficient communication technology. Not only need the new circuit design to take advantage of Single Channel Full Duplex, but also the new efficient MAC protocol’s support. Until now, there’re very few studies on Single Channel Full Duplex Protocol and this paper is the first one in China.
This paper proposed a Single Channel Full Duplex Communication Protocol based on IEEE 802.15.4. We specially designed a Full Duplex Header in frame structure. In order to efficiently exploit the full duplex communication opportunities, we added mode and next length field in the FD Header and controlled the full duplex communication mechanism dynamically. This protocol improved throughput, suppressed the hidden node issue and reduced the congestion in star topology through decreasing handshake times and reducing collision costs.
We designed a dynamic full duplex communication duration and shared random back-off. We added communication duration field in FD header and decided communication mode as well as duration based on actual data payload packet traffic. It decreased handshake times and suppressed hidden node issue after the usage of shared random back-off.
We simulated and verified this Single Channel Full Duplex Communication Protocol on the OPNET Modeler 14.5 platform. We programmed the full duplex and half duplex node model, process model, network model and wireless link model. Then we comprehensively simulated single channel full duplex point-to-point network, hidden node network and star topology network. Compared to hidden node network in half duplex, the hidden node network with Single Channel Full Duplex achieved 129% throughput gain in both links and decreased the bit error rate from 10-6 to 10-11. Compared to star topology network in half duplex, the star topology network with Single Channel Full Duplex achieved 280% gain of transmit utility and greatly reduced the congestion in star network. At last, we verified the correctness of the protocol logic functions on the CC2530 System-on-chip hardware platform.