时间：6月17日 周一上午10：30--12：00
地点：理工楼18-307学术报告厅
主讲：丁志国，哈利法大学、曼彻斯特大学教授
主办：光电与信息工程学院，医学光电科学与技术教育部重点实验室，福建省光子技术重点实验室，福建省光电传感应用工程技术研究中心
专家简介：
丁志国，哈利法大学和曼彻斯特大学教授，IEEE Fellow，IEEE ComSoc 杰出讲师，连续5年(2019-2023)入选科睿唯安全球“高被引科学家”。研究方向：机器学习、B5G网络、协作和能量收集、统计信号处理等，论文他引50000多次(Google)，h-index=100。担任IEEE TWC、OJ-COMS领域编委，以及IEEE TVT、COMST、OJ-SP编委。获欧盟居里夫人奖(2012-2014)，海因里希赫兹奖(2018)，杰克·纽鲍尔纪念奖(2018), IEEE SPL最佳论文奖(2018)，德国洪堡基金会“贝塞尔研究奖(2020)，VTS最佳综述论文奖（2023）。
讲座简介：
One recent advance in non-orthogonal multiple access (NOMA) is its use as an add-on in a massive multiple-input multiple-output (m-MIMO) based legacy space division multiple access (SDMA) network, where spatial beams preconfigured for legacy users are used to serve additional users. As a result, the connectivity and the overall system throughput of SDMA can be improved in a low-complexity and spectrally efficient manner. For conventional SDMA networks based on far-field communications, this application of NOMA is intuitive, since the far-field spatial beams are cone-shaped. Recently near-field communications have received a lot of attention as, for high carrier frequencies and large numbers of antennas, the Rayleigh distance becomes significantly large. Unlike far-field communications, the spherical-wave channel model has to be used for nearfield communications, which motivates the use of beam-focusing, i.e., a beam is focused on not only a spatial direction but also a specific location. This talk is to focus on the resolution of near-field beam-focusing and how it can be used to facilitate the application of NOMA for the coexistence between near-field and far-field communications.
