The fascinating properties arising from the interaction between different ferroic states of two-dimensional(2D) materials have inspired tremendous research interest in the past few years.Under the first-principles cal...The fascinating properties arising from the interaction between different ferroic states of two-dimensional(2D) materials have inspired tremendous research interest in the past few years.Under the first-principles calculations,we predict the coexistence of antiferromagnetic and ferroelastic states in VOX(X=Cl,Br,I) monolayers.The results illustrate that the VOX monolayers exhibit indirect bandgap characteristics,i.e.,their gaps decrease with the halide elements changing from Cl to I.The ground states of all these VOX monolayers are antiferromagnetic(AFM) with the magnetic moments contributed by the V 3d electrons.Furthermore,the magnetic ground state changing from AFM to ferromagnetism(FM) can be realized by doping carriers.In addition,the moderate ferroelastic transition barrier and reversible switching signal ensure their high performances of nonvolatile memory devices.Our findings not only offer an ideal platform for investigating the multiferroic properties,but also provide candidate materials for potential applications in spintronics.展开更多
针对非协作通信中短猝发信号准确接收的需求,在对短猝发信号进行建模的基础上,提出了一种基于极大似然准则的短猝发信号盲解调算法。根据极大似然准则,对前期信号参数估计得到的可能码元个数集合进行搜索处理,获取不同码元个数对应的第...针对非协作通信中短猝发信号准确接收的需求,在对短猝发信号进行建模的基础上,提出了一种基于极大似然准则的短猝发信号盲解调算法。根据极大似然准则,对前期信号参数估计得到的可能码元个数集合进行搜索处理,获取不同码元个数对应的第一个码元起始点位置,计算相应的重构信号与接收信号的似然度,据此实现短猝发信号码元个数的准确估计并恢复符号序列。应用二进制方波信号对盲解调算法进行仿真,仿真结果表明,当短猝发信号码元个数>8个,信噪比>10 d B时,码元个数估计正确率能够达到95%以上,解调效果良好。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12104344 and 61674003)the Shandong Provincial Natural Science Foundation,China(Grant No.ZR2021QA096)+1 种基金the Science and Technology Development Program of Weifang High-tech Industrial Development Zone,China(Grant No.2020KJHM03)the Doctoral Research Start-up Foundation of Weifang University,China(Grant No.2021BS05)。
文摘The fascinating properties arising from the interaction between different ferroic states of two-dimensional(2D) materials have inspired tremendous research interest in the past few years.Under the first-principles calculations,we predict the coexistence of antiferromagnetic and ferroelastic states in VOX(X=Cl,Br,I) monolayers.The results illustrate that the VOX monolayers exhibit indirect bandgap characteristics,i.e.,their gaps decrease with the halide elements changing from Cl to I.The ground states of all these VOX monolayers are antiferromagnetic(AFM) with the magnetic moments contributed by the V 3d electrons.Furthermore,the magnetic ground state changing from AFM to ferromagnetism(FM) can be realized by doping carriers.In addition,the moderate ferroelastic transition barrier and reversible switching signal ensure their high performances of nonvolatile memory devices.Our findings not only offer an ideal platform for investigating the multiferroic properties,but also provide candidate materials for potential applications in spintronics.
文摘针对非协作通信中短猝发信号准确接收的需求,在对短猝发信号进行建模的基础上,提出了一种基于极大似然准则的短猝发信号盲解调算法。根据极大似然准则,对前期信号参数估计得到的可能码元个数集合进行搜索处理,获取不同码元个数对应的第一个码元起始点位置,计算相应的重构信号与接收信号的似然度,据此实现短猝发信号码元个数的准确估计并恢复符号序列。应用二进制方波信号对盲解调算法进行仿真,仿真结果表明,当短猝发信号码元个数>8个,信噪比>10 d B时,码元个数估计正确率能够达到95%以上,解调效果良好。
