在美国电信科学协会(institute for telecommunication sciences,ITS)模型的基础上设计了一款易于仿真实现的宽带短波信道模拟器。通过分析其信道散射函数,验证了宽带短波信道模拟器模拟实际短波信道的有效性。采用该宽带短波信道模拟...在美国电信科学协会(institute for telecommunication sciences,ITS)模型的基础上设计了一款易于仿真实现的宽带短波信道模拟器。通过分析其信道散射函数,验证了宽带短波信道模拟器模拟实际短波信道的有效性。采用该宽带短波信道模拟器仿真测试了24 kHz信道带宽下的单载波频域均衡(single carrier modulation system withfrequency domain equalization,SC-FDE)数据传输系统的性能,说明了宽带短波信道模拟器的实际工作能力,并通过与Watterson信道模拟器的测试结果对比,证明了该宽带短波信道模拟器能更准确地测试短波宽带高速数据传输系统的性能。展开更多
增强型移动宽带是5G应用场景之一。大规模MIMO、高频大带宽以及高密度小区是实现e MBB服务和Gbit/s体验的三大关键技术。讨论了大规模MIMO技术,其最初设想是用在6 GHz以下频段范围,随后逐步扩展至6 G H z以上的毫米波频段场景。由于城...增强型移动宽带是5G应用场景之一。大规模MIMO、高频大带宽以及高密度小区是实现e MBB服务和Gbit/s体验的三大关键技术。讨论了大规模MIMO技术,其最初设想是用在6 GHz以下频段范围,随后逐步扩展至6 G H z以上的毫米波频段场景。由于城市场景中传播机制的不同,通过对比μ波和毫米波场景下的信道模型,探讨了大规模MIMO在这两种不同频率场景下的关键差异,并强调其对通信收发机的架构以及算法的可靠性、可实现性的影响,为后续大规模MIMO技术的覆盖评估提供参考。展开更多
In October 2005,the next generation mobile communication system was officially named as the International Mobile Telecommunications-Advanced(IMT-Advanced) by the ITU Radiocommunication Sector(ITU-R).Wideband multiple ...In October 2005,the next generation mobile communication system was officially named as the International Mobile Telecommunications-Advanced(IMT-Advanced) by the ITU Radiocommunication Sector(ITU-R).Wideband multiple input and multiple output(MIMO) channel models in multiple propagation environments are fundamental for IMT-Advanced systems and such research has been initiated since 2003.The research challenges come from the fact that the wider bandwidth(20-100 MHz) and the advanced multiple antenna technology have been proposed for the IMT-Advanced system,thus leading to higher sampling rates and multiple spatial propagation channels.In this review,four aspects of wideband MIMO channel measurement and modeling are discussed:(1) radio channel measurement procedure and equipment;(2) large scale fading models;(3) small scale fading models;and(4) MIMO channel models.In particular,the large scale fading affected by the carrier frequency is investigated for urban macrocells and it shows that the higher carrier frequency results in greater loss for non-line-of-sight(NLoS) conditions in the cities of China,for which the frequency dependent factor is 32.1.Moreover,the dense and the obviously higher buildings also lead to a larger angle spread(AS) of both the angle of arrival and angle of departure in urban macrocell scenarios.The results indicate that there is the potential to explore the MIMO technique for an IMT-Advanced system with larger ASs,which would lead to the high system capacity.The progress on MIMO models is described and some methods for simplifying geometry-based stochastic channel models(GBSM) are proposed.Finally future research topics on channel measurement and modeling are identified.展开更多
文摘增强型移动宽带是5G应用场景之一。大规模MIMO、高频大带宽以及高密度小区是实现e MBB服务和Gbit/s体验的三大关键技术。讨论了大规模MIMO技术,其最初设想是用在6 GHz以下频段范围,随后逐步扩展至6 G H z以上的毫米波频段场景。由于城市场景中传播机制的不同,通过对比μ波和毫米波场景下的信道模型,探讨了大规模MIMO在这两种不同频率场景下的关键差异,并强调其对通信收发机的架构以及算法的可靠性、可实现性的影响,为后续大规模MIMO技术的覆盖评估提供参考。
基金supported by the National Natural Science Foundation of China (61171105 and 61121001)National Key Technology Research and Development Program of the Ministry of Science and Technology of China(2012BAF14B01)National Science and Technology Major Project of the Ministry of Science and Technology of China (2009ZX03007-003-01)
文摘In October 2005,the next generation mobile communication system was officially named as the International Mobile Telecommunications-Advanced(IMT-Advanced) by the ITU Radiocommunication Sector(ITU-R).Wideband multiple input and multiple output(MIMO) channel models in multiple propagation environments are fundamental for IMT-Advanced systems and such research has been initiated since 2003.The research challenges come from the fact that the wider bandwidth(20-100 MHz) and the advanced multiple antenna technology have been proposed for the IMT-Advanced system,thus leading to higher sampling rates and multiple spatial propagation channels.In this review,four aspects of wideband MIMO channel measurement and modeling are discussed:(1) radio channel measurement procedure and equipment;(2) large scale fading models;(3) small scale fading models;and(4) MIMO channel models.In particular,the large scale fading affected by the carrier frequency is investigated for urban macrocells and it shows that the higher carrier frequency results in greater loss for non-line-of-sight(NLoS) conditions in the cities of China,for which the frequency dependent factor is 32.1.Moreover,the dense and the obviously higher buildings also lead to a larger angle spread(AS) of both the angle of arrival and angle of departure in urban macrocell scenarios.The results indicate that there is the potential to explore the MIMO technique for an IMT-Advanced system with larger ASs,which would lead to the high system capacity.The progress on MIMO models is described and some methods for simplifying geometry-based stochastic channel models(GBSM) are proposed.Finally future research topics on channel measurement and modeling are identified.
