Web of Science(WOS)引文索引库和Essential Science Indicators(ESI)基本科学指标数据库是常用的高校或科研机构学术水平评价工具。基于武汉大学在WOS中的整体发文情况和ESI中的优势学科和高影响力论文数据,从多个视角对武汉大学的科...Web of Science(WOS)引文索引库和Essential Science Indicators(ESI)基本科学指标数据库是常用的高校或科研机构学术水平评价工具。基于武汉大学在WOS中的整体发文情况和ESI中的优势学科和高影响力论文数据,从多个视角对武汉大学的科研产出进行了综合分析与评估,充分展现了武汉大学当前的国际影响力、优势学科地位以及国内外科研合作现况。展开更多
目前,各运营商仅在Sub-6 GHz频段建设基站,并未实现频率范围2(Frequency Range 2,FR2)的5G商业部署。相较于中国电信股份有限公司江苏分公司现网部署的3.5 GHz频段,毫米波频段较高,基站需部署更多天线来获得更多的波束增益,以弥补FR2频...目前,各运营商仅在Sub-6 GHz频段建设基站,并未实现频率范围2(Frequency Range 2,FR2)的5G商业部署。相较于中国电信股份有限公司江苏分公司现网部署的3.5 GHz频段,毫米波频段较高,基站需部署更多天线来获得更多的波束增益,以弥补FR2频段的高路径损耗。因为通信波束较窄,基站与终端只有使用最佳波束对通信才可获得较高的通信速率,所以高效的波束搜索方案必不可少。在后5G(Beyond 5G,B5G)场景下提出一种波束搜索方法,相较于遍历搜索,可在复杂度降低99.999%的同时获得较高的频谱效率。展开更多
In this article, an inter-antenna inter-subblock shifting and inversion （IASSI） scheme is proposed to reduce the peak-to-average power ratio （PAPR） in multi-input multioutput orthogonal frequency division multiple...In this article, an inter-antenna inter-subblock shifting and inversion （IASSI） scheme is proposed to reduce the peak-to-average power ratio （PAPR） in multi-input multioutput orthogonal frequency division multiplexing （MIMO- OFDM） systems. It exploits multiple antennas and subblocks to provide additional degrees of freedom to benefit the system. To reduce the implementation complexity of the proposed scheme, two simple suboptimal schemes are further presented based on the minimum current maximum criterion; one adopts sequential search and the other employs random binary grouping. The simulation results exhibit the effectiveness of these proposed schemes.展开更多
文摘Web of Science(WOS)引文索引库和Essential Science Indicators(ESI)基本科学指标数据库是常用的高校或科研机构学术水平评价工具。基于武汉大学在WOS中的整体发文情况和ESI中的优势学科和高影响力论文数据,从多个视角对武汉大学的科研产出进行了综合分析与评估,充分展现了武汉大学当前的国际影响力、优势学科地位以及国内外科研合作现况。
基金the National Natural Science Foundation of China（NSFC 60496312）；the Hi-Tech Research and Development Program of China（2006AA01Z260）；KDDI company of Japan.
文摘In this article, an inter-antenna inter-subblock shifting and inversion （IASSI） scheme is proposed to reduce the peak-to-average power ratio （PAPR） in multi-input multioutput orthogonal frequency division multiplexing （MIMO- OFDM） systems. It exploits multiple antennas and subblocks to provide additional degrees of freedom to benefit the system. To reduce the implementation complexity of the proposed scheme, two simple suboptimal schemes are further presented based on the minimum current maximum criterion; one adopts sequential search and the other employs random binary grouping. The simulation results exhibit the effectiveness of these proposed schemes.
