Assoc. Prof. Tianming Ma (Senior member & life member of CIE, Senior member of CIC, Council member of SHIE)

Shanghai University of Engineering Science, China

Tianming Ma received the Ph.D degree from Shanghai institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences, Shanghai, China, in 2012. He was a post-doctoral researcher and obtained the first-class general financial grant from the China Postdoctoral Science Foundation in Tsinghua University, Beijing, China from 2012 to 2014. Now he is an associate professor in the School of Electronic & Electrical Engineering (SEEE) at Shanghai University of Engineering Science (SUES), Shanghai, China and serves as the leader of the intelligent wireless perception research team in SEEE. He has authored/co-authored over 60 journal/conference papers and held 10 Chinese authorized invention patents as the first inventor or as a mentor for graduate students, of which 3 have already achieved technology transfer. He is a member of IEEE ComSoc & IEEE SPS, a senior member of CIC, a senior member & life member of CIE, a life member of SCS, a council member of SHIE, and the main contract person of RISTA. He has served more than 30 times as an OC member/TPC member/Track Chair/Session Chair/Special Session Chair/Workshop Chair/ Symposium Co-Chair/Publicity Chair/Program Committee Chair/Moderator/Invited Speaker of many prominences international conferences and received several Outstanding Organization Awards. He has also served as an official reviewer for many renowned journals in the field of communications both domestically and internationally, such as IEEE TWC, IEEE TVT, IEEE CNCOMM, IEEE CL, IEEE SPL, CJE, JC, JEIT, JSEE, JCIN, JCUPT, JXU, etc. His current interests include 6G waveform modulation technologies & multiple access technologies.

Speech Title: Micro/Nanoelectronics: Current Status, Outlook, and Reliability Issues

Abstract: Orthogonal delay-Doppler modulation (ODDM) provides robust performance in high-mobility communication scenarios, yet it suffers from significant path loss in obstructed propagation environments. Reconfigurable intelligent surfaces (RISs) can effectively address this limitation by establishing virtual line-of-sight links, but their integration with ODDM systems for energy-efficient communication remains unexplored. This work initiates the study of energy efficiency (EE) optimization in RIS-aided ODDM systems over doubly-selective channels, where a multi-user multiple-input single-output (MU-MISO) framework with interference is considered. A joint optimization framework is proposed to maximize the EE, where the transmit precoder at the BS and the phase-shift matrices at the RIS are co-designed under quality of service (QoS) and unit-modulus constraints. To address the non-convex fractional objective, we develop an alternating optimization (AO) algorithm that incorporates Dinkelbach's method, where the precoding subproblem is convexified by introducing auxiliary variables and exploiting binomial inequalities, and the RIS phase shifts admit a closed-form solution via exploiting complex conjugate symmetry. Numerical results demonstrate that our proposed scheme achieves substantial EE improvement over baseline schemes, while simultaneously delivering superior BER performance--confirming that the EE gains are achieved without compromising link reliability.