简介:GermanhiphophopefulsMassiveTonebroughtDeutschebeatstoPekingUniversity.'Bine,tanzen!'(Please,dance!)wastherallyingcryfromGermanhiphopgroupMassiveToneastheytookthestagefortheirrecentgigatChina'smostprestigiousuniversity.ThetriofromStuttgartmadetheirChinadebutatPekingUniversityConcertHallin
简介:Theperformanceofmassivemultiple-inputmultiple-output(MIMO)systemislimitedbypilotcontamination.Toreducethepilotcontamination,uplinkanddownlinkprecodingalgorithmsareputforwardbasedoninterferencealignmentcriterion.Intheuplinkreceivingprocessing,thetargetfunctionalignsthepilotcontaminationandtheinterferencesignalstothesamenullspaceandacquiresthemaximalspacedegreeofthedesiredsignals.Theuplinkreceivingprecodingmatrixissolvedonmaximalsignaltointerferenceplusnoiseratio(SINR)criterionconsideringtheimpactofthepilotcontaminationonchannelestimations.Theuplinkreceivingprecodingmatrixisusedasthedownlinktransmittingprecodingmatrix.Exploitingthechannelreciprocity,itisprovedthat,iftheuplinkreceivingprecodingmatrixachievesmaximalSINR,theidenticalprecodingmatrixcanbeusedinthedownlinktransmissionandacquiresmaximalsignaltoleakageplusnoiseratio(SLNR).Simulationsshowthatthespectrumefficiencyoftheproposedalgorithmcanreachabout1.5timeshigherthanthatofpopularmatchedfiltering(MF)precodingalgorithm,andabout1.1timeshigherthanmulti-cellminimummeansquareerror(MMSE)precodingalgorithm.Theperformanceoftheproposedalgorithmcanbeimprovedapproximatelylinearlywiththeincreasingofthenumberofantennas.
简介:「ButterflyCaught」是MassiveAttack乐队新专辑「100thWindow」的第二首单曲,在这部MV中,我们看到一只飞蛾栖息在歌手的身边,鼓动着羽翼,渐渐的,飞蛾和歌手的脸融为一体,歌手的脸慢慢转变成飞蛾的纹理……
简介:AbstractBlunt traumatic tracheobronchial injury is rare, but can be potentially life-threatening. It accounts for only 0.5%-2% of all trauma cases. Patients may present with non-specific signs and symptoms, requiring a high index of suspicion with accurate diagnosis and prompt treatment. A 26-year-old female was brought into the emergency department after sustained a blunt trauma to the chest from a high impact motor vehicle accident. She presented with signs of respiratory distress and extensive subcutaneous emphysema from the chest up to the neck. Her airway was secured and chest drain was inserted for right sided pneumothorax. CT of the neck and thorax revealed a collapsed right middle lung lobe with a massive pneumothorax, raising the suspicion of a right middle lobe bronchus injury. Diagnosis was confirmed by bronchoscopy. In view of the difficulty in maintaining her ventilation and persistent pneumothorax with a massive air leak, immediate right thoracotomy via posterolateral approach was performed. The right middle lobar bronchus tear was repaired. There were no intra- or post-operative complications. She made an uneventful recovery. She was asymptomatic at her first month follow-up. A repeated chest X-ray showed expanded lungs. Details of the case including clinical presentation, imaging and management were discussed with an emphasis on the early uses of bronchoscopy in case of suspected blunt traumatic tracheobronchial injury. A review of the current literature of tracheobronchial injury management was presented.
简介:AsymplectiteofpyriteandmagnetiteinthemassivesulphideoreoftheMashanmine,AnhuiProvince,isinterpretedtohavebeenformedbytheirreplacingearlierpyrrhotite.Thecompositionsofpyrrhotite,pyriteandmagnetiterelatedtothistexturearegivenbyelectronmicroprobeanalysis.Suchatextureislikelytobeformedwhentheore-formingsystemreachesthethree-phasepointofpyrrhotite,pyriteandmagnetitefromthepyrrhotitestabilityfield.Theverysmallprobabilityforthesystemtoreachthispointcouldbeusedtoaccountfortherareoccurrenceofsuchsymplectiteinnaturalores.
简介:与增加的精力消费,精力效率(EE)作为光谱效率(SE)为无线通讯网络被看作了一个重要度量标准。在这份报纸,为downlink多用户的EE优化问题多重输入多重产量(MU-MIMO)有巨大的天线的系统被调查。根据凸的优化理论,在那里存在完成最佳的EE的唯一的全球性最佳的电源分配,并且仅仅与隧道状态信息有关的最佳的EE靠近形式被导出经分解。然后,两个都,有不同复杂性的近似、精确的电源分配算法被建议完成最佳的EE。近似算法获得的最佳的EE与一致到在可控制的错误限制以内由精确算法完成了那的模拟结果表演,和这些建议算法比存在相等的电源分配算法更好表现。有在底的天线的数字的最佳的EE和相应SE增加驻扎无线通讯网络,它为下一代是有希望的。
简介:5G通信相对4G优势是全方位的,特别是毫米波、小基站、massiveMIMO、全双工、波束成形等5大技术,应用领域宽广如物联网、车联网、VR等,是面向2020年以后的通信需求的新一代通信系统。而大规模天线是未来天线的发展趋势,5G是无线关键技术之一,是5G通信的“高速公路”,但利弊共存,且其测试也具有挑战性。文章对5G通信与massiveMIMO天线技术进行了研究。
简介:摘要:本文介绍了5G室内分布式Massive MIMO增强技术。首先概述了5G通信技术的基本原理和特点以及Massive MIMO技术的原理和优势。然后,讨论了室内分布式Massive MIMO系统的设计考虑和室内分布式Massive MIMO系统的信道特性分析。接着,阐述了性能评估和仿真结果关键点。最后,讨论了实现和部署室内分布式Massive MIMO系统的考虑因素,包括天线布置、系统硬件选择、信号处理和网络管理等方面。本文的研究对于推动5G室内通信技术的发展具有重要意义。