时间：2018-11-21 （星期三）10:00 -11:00am
地点：计算中心 B415
主讲人：苏柏青 教授 (台湾大学)
联系人： 蒋轶
 
Abstract: 
Generalized frequency division multiplexing (GFDM) is one promising modulation scheme featuring low out-of-band (OOB) radiation for future wireless communication systems. However, GFDM systems are usually considered non-orthogonal, incurring in-band performance degradation in receiver mean square error (MSE) and symbol error rate (SER) compared to the counterparts of orthogonal frequency division multiplexing (OFDM). In addition, the implementation complexity of GFDM transceivers is also one of the important issues that prevent GFDM from being widely adopted. 
 
GFDM modulation is characterized by a prototype filter, usually expressed in time-domain or in frequency-domain in the literature. In this talk, we first introduce a new characterization that provides straightforward insights into important properties of GFDM matrices including invertibility and unitarity. The new characterization also leads to low-complexity transceiver implementation which is at the same order of OFDM transceivers. Then, it will be shown that if a unitary GFDM matrix is chosen as the modulation matrix, the noise amplification problem usually mentioned in the GFDM literature will vanish, and a low-complexity MMSE receiver is found to exist. The GFDM prototype filter, under the constraint of a unitary GFDM matrix, can be further designed to minimize out-of-band emission. Simulation results are given to verify the theory and important insights will be addressed in the presentation.
 
Bio: 
Borching Su received the B.S. and M.S. degrees in electrical engineering (EE) and communication engineering, both from National Taiwan University, in 1999 and 2001, respectively, and the Ph.D. degree in EE from the California Institute of Technology, Pasadena, CA, in 2008. Dr. Su received Charles H. Wilts prize from Caltech for his Ph.D. thesis on blind channel estimation. He was with NextWave Broadband, Inc., San Diego, CA, in 2008. In 2009, Dr. Su joined National Taiwan University (NTU). His research interests include signal processing for communications, particularly waveform designs for next-generation communication systems.  He is a 3GPP standardization delegate for National Taiwan University.