报告题目：Low/Zero Ambiguity Zone: Theoretical Bounds and Doppler-Resilient Sequence Design in Integrated Sensing and Communication Systems

报 告 人： 周正春  西南交通大学 教授

报告时间：2022年4月26日（周二）下午13:30-15:00

报告形式：腾讯会议  会议号：628 433 091

报告摘要：In radar sensing and communications, designing Doppler resilient sequences (DRSs) with low ambiguity function for delay over the entire signal duration and Doppler shift over the entire signal bandwidth is an extremely difficult task. However, in practice, the Doppler frequency range is normally much smaller than the bandwidth of the transmitted signal, and it is relatively easy to attain quasi-synchronization for delays far less than the entire signal duration. In this talk, we shall introduce a new concept called low ambiguity zone (LAZ) which is a small area of the corresponding ambiguity function of interest defined by the certain Doppler frequency and delay. Such an LAZ will reduce to a zero ambiguity zone (ZAZ) if the maximum ambiguity values of interest are zero. We will introduce a set of theoretical bounds on periodic LAZ/ZAZ of unimodular DRSs with and without spectral constraints, which include the existing bounds on periodic global ambiguity function as special cases. These bounds may be used as theoretical design guidelines to measure the optimality of sequences against Doppler effect. We will also present four optimal constructions of DRSs with respect to the derived ambiguity lower bounds based on some algebraic tools such as characters over finite field and cyclic difference sets.

报告人简介：周正春，西南交通大学教授、博士生导师。一直致力于面向通信、雷达、数据降维和信息安全的编码理论和电子信息对抗技术研究，在领域权威期刊发表论文60余篇；先后完成多项国家级、省部级、国防和企业委托项目。入选国家“青年拔尖人才”；曾获全国百篇优秀博士论文获、教育部自然科学二等奖（2次）；设计的一类优相关低PAPR波形入选下一代WIFI国际标准。