Invited Speaker

Maltsev Alexander

Maltsev Alexander

Professor, Mobile Communications Department, University of Nizhny Novgorod (UNN), Russia
Speech Title: Phase Tracking Sequences for 5G NR in 52.6-71 GHz Band: Design and Analysis

Abstract: This paper presents a novel approach to the phase tracking reference signal (PTRS) design in the 5G NR communication systems intended to work in a new 52.6 GHz to 71 GHz frequency band. For detailed problem illustration, the phase noise (PN) compensation algorithms are discussed and explained, from the basic common phase error (CPE) compensation to the MMSE-based inter carrier interference (ICI) filtering in frequency domain. Performance of the different algorithms is investigated for the baseline PTRS structure accepted in the current 5G NR specification and compared with a new proposed approach to the PTRS design. This approach is based on nulling a few subcarriers adjacent to each reference signal to minimize influence of the ICI on the PN estimation process. It was shown that the new PTRS design outperforms currently used distributed PTRS structure. Moreover, with new PTRSs, the performance of the simple least squares (LS) phase noise estimation method reaches the performance of the semi-optimal MMSE estimator, which has significantly larger complexity. Generally, achievable level of phase noise compensation for a given PTRS overhead is determined by the filter size, while advanced algorithms and approaches may improve filter coefficient estimation accuracy.

Keywords: 5G NR, phase tracking, phase noise, PTRS, common phase error, OFDM, least squares, phase noise compensation

Acknowledgements: Authors deeply thank Dr. Woong-Kee Min from the LG Technology Center, Moscow and Dr. Joon-Kui Ahn from the LG Electronics, Seoul for the organization of fruitful cooperation between overseas teams and making this paper possible

Biography: Alexander Maltsev received the Doctor of Science degree, in Radiophysics, from the University of Nizhny Novgorod (UNN), Russia, in 1990. After that he held the position of a Full Professor (1990 to 1994) and from 1994 till present he is holding the position of Head of the Statistical Radiophysics and Mobile Communications department in the UNN. In April 2001 Prof. Maltsev joined Intel Corporation and created the Advance Development (AD) team in Intel Russia from his former PhD students. From April 2006 to June 2020 he was an Intel Principal Engineer managing AD team. In August 2020 he joined to LG Electronics as a consulting researcher.
Prof. Maltsev contributed to development of Wi-Fi (IEEE802.11n, 11ad), WiMAX (IEEE802.16e, 16m), WiGig and LTE standards, participated in FP6 MEMBRANE (Multi-Element Multihop Backhaul Reconfigurable Antenna Network) project (2006-2009), headed the Russian Evaluation Group in IMT-Advanced (4G) evaluation process in ITU (2010-2011), participated as a technical expert in joint EU-Japan research FP7 project MiWEBA (Millimeter-Wave Evolution for Backhaul and Access) in 2013-2016.
Prof. Maltsev is author of numerous papers in refereed journals and conferences proceedings and holds more than 150 US patents. His current research interests include optimal and adaptive statistical signal processing, channel modeling and positioning, hybrid beamforming algorithms and mmWave high-gain steerable antennas, modern MIMO-OFDM communication systems, including IEEE802.11ay, IEEE802.11be, IEEE802.11Sens and 5G NR.