Seminar Title: Full-Duplex Wireless Communications
Trình bày: Giáo sư Lê Ngọc Thọ từ ĐH McGill Canada
Thời gian: 15 giờ Thứ 2 ngày 27/11/2017
Địa điểm: Phòng Chuyên Đề Khoa Điện-Điện tử (Phòng 104B1), 270 Lý Thường Kiệt, ĐHBK TPHCM
Abstract: Enabling wireless transceivers to operate in full-duplex (FD) fashion, by simultaneously transmitting and receiving over the same frequency band, offers the potential to double their transmission rate or spectral efficiency, as compared to currently used half-duplex (HD) transmission mode. When simultaneously transmitting and receiving, the transceiver experiences co-channel interference from its own transmitter, known as self-interference (SI). This SI is usually several orders of magnitude higher than the intended signal, transmitted by the other transceiver, as the later signal crosses longer distance than the SI. Given that the transmitted SI is known, one may directly use it to remove the SI from the received signal. However, the propagation channel and the transmitter (Tx) and receiver (Rx) impairments affect the received SI making it different from the known transmitted signal. A good self-interference (SI) cancellation strategy in full-duplex (FD) communication passes first by a proper understanding of the nature of this SI. The SI can be gradually reduced by a combination of radio-frequency (RF) and baseband cancellation stages. Each stage requires the estimation of the different distortions that the SI endures such as the SI channel and the transceiver nonlinearities.
This talk will start with the SI-channel characteristics, and then continue with the various SI-cancellation aspects: strategies, limiting factors, and techniques, and end with potential FD applications.
Bio & Photo:
Tho Le-Ngoc obtained his B.Eng. (with Distinction) in Electrical Engineering in 1976, his M.Eng. in Microprocessor Applications in 1978 from McGill University, Montreal, and his Ph.D. in Digital Communications 1983 from the University of Ottawa, Canada.
During 1977-1982, he was with Spar Aerospace Limited as a Design Engineer and then a Senior Design Engineer, involved in the development and design of the microprocessor-based controller of Canadarm (of the Space Shuttle), and SCPC/FM, SCPC/PSK, TDMA satellite communications systems.
During 1982-1985, he was an Engineering Manager of the Radio Group in the Department of Development Engineering of SRTelecom Inc., developed the new point-to-multipoint DA-TDMA/TDM Subscriber Radio System SR500. He was the System Architect of this first digital point-to-multipoint wireless TDMA system.
During 1985-2000, he was a Professor in the Department of Electrical and Computer Engineering of Concordia University.
Since 2000, he has been a Professor in the Department of Electrical and Computer Engineering of McGill University.
He is a Senior Member of the Ordre des Ingénieur du Quebec, a Fellow of the Institute of Electrical and Electronics Engineers (IEEE), the Engineering Institute of Canada (EIC), the Canadian Academy of Engineering (CAE), and the Royal Society of Canada (RSC).
He is a recipient of the 2004 Canadian Award in Telecommunications Research, the IEEE Canada Fessenden Award 2005, the 2013 Queen Elizabeth II Diamond Jubilee Medal, and the 2014 Award for Best Collaboration with Huawei Wireless.
He holds a Canada Research Chair (Tier I) on Broadband Access Communications.
Since 1985, he has been a consultant, Technical Advisor, Chief Architect, Chief Scientist to several companies in communications.