University of California, Riverside

Department of Electrical and Computer Engineering

Dr. Yang-Seok Choi: Simultaneous Transmission and Reception

Dr. Yang-Seok Choi: Simultaneous Transmission and Reception

Dr. Yang-Seok Choi: Simultaneous Transmission and Reception

December 31, 1969 - 4:00 pm
Winston Chung Hall, 205/206



Full Duplex or Simultaneous transmission and reception (STR) in the same frequency at the same time can potentially double the physical layer capacity. However, high power transmit signal will appear at receive chain as echoes with powers much higher than the desired received signal. Therefore, in order to achieve the potential gain, it is imperative to cancel these echoes. As these high power echoes can saturate low noise amplifier (LNA) and also digital domain echo cancellation requires unrealistically high resolution analog-to-digital converter (ADC), the echoes should be cancelled or suppressed sufficientlybefore LNA. In this talk we present a closed-loop echo cancellation technique which can be implemented purely in analogue domain. The advantages of our method are multiple fold: it is robust to phase noise, does not require additional set of antennas, can be applied to wideband signals and the performance is      irrelevant to radio frequency (RF) impairments in transmit chain.






Yang-Seok Choi received the B.S. degree from Korea University, Seoul, Korea, in 1990, the M.S.E.E. degree from Korea Advanced Institute of Science and Technology (KAIST), Taejon, Korea, in 1992, and the Ph.D. degree fromPolytechnic University, Brooklyn, NY, USA in 2000, all in electrical engineering.  He has been in industry including Samsung, AT&T Labs-Research, and Intel for more than 20 years. His works cover many aspects of signal processing and wireless communications including hardware development for high speed modem, international standards development, advanced technology developments andresearch in PHY and MAC.




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Electrical and Computer Engineering
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University of California, Riverside
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