时间：2024年11月21日10:30-11:30

地点：信息学院1号楼英慧学术报告厅

报告人：Avik Ranjan Adhikary

报告人简介：Avik Ranjan Adhikary于2011年获得印度Calcutta大学（CU）Ramakrishna Mission Vidyamandira （RKMV）学院的数学学士学位，2013年获得印度Guwahati理工学院（IITG）数学硕士学位，2019年获得印度Patna理工学院（IITP）数学博士学位。2015年8月至2016年1月任新加坡南洋理工大学客座研究员。2019年6月至2023年6月，任西南交通大学数学学院博士后。2023年8月，任西南交通大学数学学院特聘副研究员。研究兴趣为具有优良性能的序列设计。

内容简介：Pilot sequence design over doubly selective channels (DSC) is challenging due to the variations in both the time- and frequency-domains. Against this background, the contribution of this paper is twofold: Firstly, we investigate the optimal sequence design criteria for efficient channel estimation in orthogonal frequency division multiplexing systems under DSC. Secondly, to design pilot sequences that can satisfy the derived criteria, we propose a new metric called oversampled ambiguity function (O-AF), which considers both fractional and integer Doppler frequency shifts. Optimizing the sidelobes of O-AF through a modified iterative twisted approximation (ITROX) algorithm, we develop a new class of pilot sequences called “oversampled low ambiguity zone (O-LAZ) sequences”. Through numerical experiments, we evaluate the efficiency of the proposed OLAZ sequences over the traditional low ambiguity zone (LAZ) sequences, Zadoff-Chu (ZC) sequences and m-sequences, by comparing their channel estimation performances over DSC.

信息科学与工程学院（软件学院）

2024年11月20日