Multiple phases tracking and compensation for LOS MIMO systems

针对LOS MIMO系统中分布式天线的多个发送端相位噪声和多个接收端相位噪声,基于LMS准则和线性均衡提出了多相位跟踪与补偿算法,通过仿真分析了该算法在不同的振荡器配置、相位噪声带宽、调制阶数和迭代步长下系统的误符号率性能。并与基于锁相环的多相位跟踪算法(PLL)作比较,结果表明:LMS算法的误符号率性能明显优于PLL算法,能有效降低LOS MIMO系统的误符号率,且更具有实用性。Aiming at the multiple phase noises in distributed transmitter and receiver antennas of LOS MIMO systems,a tracking and compensation algorithm for multiple phases based on LMS criterion and linear equalization is proposed.The symbol error rate（SER） performance is analyzed by simulations under various oscillator configurations,phase noise bandwidth,modulation orders and step sizes.Then,compared with the existed algorithm based on phase-locked loop（PLL）,the simulation results show that the SER performance of the LMS algorithm is superior to the PLL algorithm.The proposed LMS algorithm can reduce the SER of LOS MIMO systems more efficiently,thus is more practicable than the PLL algorithm.国家自然科学基金(61362010)； 广西自然科学基金(2016GXNSFAA380091)； 广西高等学校科学研究项目(2013YB073

The Syntheses and Photovoltaic EFFects of Metallophthalocyanines with Substituents

用硝酸镧、硝酸铈铵和硝酸铝分别溶于草酸铵水溶液中，干燥后所得前驱体经磨粉和压片，在600℃和700℃温度下焙烧分解，合成了具有钙钛矿型结构的lAAlO3和CEAlO3化合物粉末.X射线衍射和dSC分析结果推断前驱体的脱水、分解、中间体形成及转变为lAAlO3和CEAlO3多晶相是个多步复杂过程.此类软化学方法的运用大大降低了这些化合物的合成温度.Complexes of hexadecachloro , hexadecahydro , tetranitro and tetra amino phthalocyanines with copper are prepared.Their photovoltaic eFFects on Pt and GaAs electrodes are examined.The results show that the electron withdrawing substituents enhance the photo response, whereas the electron donating substituents reduce the photo response.福建省自然科学基金;国家教委回国科研基

Polyoxometalate Charge directed Self-assembly of Ag(Ⅰ)Complexes Containing Unusual 2,2′-Bipyridine Acting as a Bridging Ligand

水热条件下合成了2,2′-联吡啶(2,2′-bIPyrIdInE=2,2′-bIPy)与Ag(I)及PW12O403-,SIW12O404-形成的配合物{[Ag3(2,2′-bIPy)4(PW12O40)]·2H2O}n(1),{[Ag4(2,2′-bIPy)6](SIW12O40)}n(2)和{[Ag2(2,2′-bIPy)3]2(SIW12O40)}n(3).通过元素分析和红外光谱、X-射线单晶衍射对其组成和结构进行了表征.晶体结构分析结果表明:产物的结构是由多酸离子的电荷调控的;并发现这3种配合物中都存在2,2′-bIPy的桥式配位模式;本研究详细总结和探讨了2,2′-bIPy的桥式配位模式存在的体系及其可能原因.Three complexes,{[Ag3(2,2′-bipy)4(PW12O40)]·2H2O}n(1),{[Ag4(2,2′-bipy)6](SiW12O40)}n(2)and{[Ag2(2,2′-bipy)3]2(SiW12O40)}n(3)(2,2′-bipyridine=2,2′-bipy)were synthesized under hydrothermal condition.The complexes were characterized by elemental analysis,IR spectra and X-ray single crystal diffraction.Single-crystal X-ray diffraction analysis reveals that the complexes all containing unusual 2,2′-bipy acting as a bridging ligand and their structures were controlled by the charge of polyoxometalate.The possible causes of 2,2′-bipy acting as a bridging ligand are also discussed in detail.国家自然科学基金项目(21071119

Activated carbongraphene composites with high-rate performance as electrode materials for electrochemical capacitors

Activated carbongraphene composites with high-rate performance as electrode materials for electrochemical capacitor