ECE Seminar - Bandwidth-Efficient 2-Path Space-Time Parallel Cancellation with Convolutional Code
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Abstract: Carrier frequency offset, Doppler shift, and phase noise degrade the orthogonality of subcarriers in Orthogonal Frequency Division Multiplexing (OFDM) systems, leading to intercarrier interference (ICI). While a parallel cancellation (PC) schemes have been proposed to mitigate ICI, namely, Space-Time Parallel Cancellation (STPC). STPC has a lower bit error rate (BER) at the cost of double transmission time in time division multiplexing (TDM) mode when Doppler velocity exists in comparing with space-time code (STC) OFDM. In this talk, a new 2-path STPC algorithm is developed without TDM operation at the transceiver and is enhanced by integrating convolutional coding with an optimal code vector and Viterbi decoding for forward error correction (FEC). The proposed scheme guarantees a lower error floor with increasing bandwidth, as the redundancy introduced by FEC. Performance evaluations demonstrate that our uncoded and coded new STPC-OFDM scheme achieves superior bit error rate (BER) performance compared to the uncoded and coded STC-OFDM approach, making it a robust and bandwidth-efficient solution for OFDM-based communication systems.
Prof. Hen-Geul Yeh received the B.S. degree in Engineering Science from National Chen Kung University, Taiwan, China in 1978, and the M.S. degree in Mechanical Engineering and the Ph.D. degree in Electrical Engineering from the University of California at Irvine, Irvine, in 1979 and 1982, respectively. Since 1983, he has been with the Electrical Engineering Department, California State University Long Beach (CSULB), USA, and the Department Chair, 2016 -2022. His research interests include Machine Learning/DSP/communication/control algorithms development and applications to communication systems, smart grids, optimization, controls, and electrical event detection. He is a Professional Engineer in Electrical and was a recipient of five NASA Technology Brief and New Technology Awards from the National Aeronautics and Space Administration (NASA), the Inventor’s Award, the IEEE R6 Outstanding Educator Award. He has received eight U.S. patents in signal processing, communication, and controls. He is the founder and has served as the Organizer and Conference Chair for IEEE Green Energy and Smart Systems Conference (IGESSC) from 2010-2021. He is a senior member of the National Academy of Inventors and a senior member of IEEE.