NSF SpectrumX invites you to the next Radio Shop Chat, “Propagation Channel Measurements and Models for 6G in Urban Environments,” featuring Andreas F. Molisch on Wednesday, April 1 at 3 p.m. ET.
Registration is required and free.
Abstract
The increasing demand for existing wireless services, and the emergence of new ones, requires a re-assessment of the use of spectrum for different purposes. A prerequisite for any such evaluation is knowledge about how wireless signals propagate in the different frequency ranges, as this impacts both the fitness of a particular spectrum for a particular purpose, and impacts potential interference with incumbent services in the same or adjacent bands. This talk will discuss recent propagation measurements and resulting models in urban environments. Showcasing some of the recent results in our group that elucidate previously unknown channel properties and demonstrate the ongoing importance of new channel measurements. We firstly show results from a massive distributed-MIMO measurement campaign that not only provides physical insights into potentially corrected propagation processes, but also led to a new channel model, called CUNEC, that in a self-consistent, measurement-based manner characterizes correlated pathloss between (arbitrarily many) UE-AP links. In the 6-18 GHz range, recent ultrawideband measurements from our group indicate the special importance of urban vegetation. which shows a distinct change over FR3, and suggest the distinction between line of sight (LOS), obstructed line of sight (OLOS), and non-line of sight (NLOS). For the 145 GHz range, we will discuss our results from measurement campaigns and their evaluation with high-resolution parameter estimation, demonstrating that the standard assumptions of the 3GPP model are not consistent with the measured physical reality at this band. We also demonstrate a new channel sounder that can dramatically speed up directionally resolved measurements at frequency bands above ~30 GHz. Finally, we will point out limitations of current models for line of sight probability, which significantly impact interference analysis, and discuss improvements. The needs for further work in this area will be discussed in conclusion.
Speaker Bio
Andreas F. Molisch is the Solomon Golomb – Andrew and Erna Viterbi Chair and Professor at the University of Southern California (USC), where he also heads the Wireless Devices and Systems (WiDeS) group and the Center for Wireless Propagation Research (CWPR). Before joining USC in 2009, he spent 10 years in industry, including AT&T (Bell) Labs and Mitsubishi Electric Research Labs, where he rose to Chief Wireless Standards Architect. His research interest is wireless communications, with emphasis on wireless propagation channels, multi-antenna systems, ultrawideband signaling and localization, and novel modulation methods. He is the author of five books (including Wireless Communications, 3rd ed. 2023), more than 750 papers, and 80 patents; his work has been cited more than 80,000 times; his h-index is 120. He is a Fellow of the National Academy of Inventors, IEEE, AAAS, IET, AAIA, and URSI, Member of the Austrian Academy of Sciences, and recipient of numerous awards.