Based on the point spread function （PSF） theory, the side-lobe extension direction of the impulse response in bistatic synthetic aperture radar （BSAR） is analyzed in detail; in addition, the corresponding autofocu...Based on the point spread function （PSF） theory, the side-lobe extension direction of the impulse response in bistatic synthetic aperture radar （BSAR） is analyzed in detail; in addition, the corresponding autofocus in BSAR should be considered along iso-range direction, not the traditional azimuth resolution （AR） direction. The conclusion is verified by the computer simulation.展开更多
为了给下一代无线通信系统(B3G:Beyond 3G)参数设计提供参考以及为算法仿真提供信道建模,针对国内城市室外环境不同的传播场景,在5.8 GHz频段和20 MHz信道带宽的测量条件下,进行了室外信道测量和研究。根据测量数据统计分析,5.8 GHz频...为了给下一代无线通信系统(B3G:Beyond 3G)参数设计提供参考以及为算法仿真提供信道建模,针对国内城市室外环境不同的传播场景,在5.8 GHz频段和20 MHz信道带宽的测量条件下,进行了室外信道测量和研究。根据测量数据统计分析,5.8 GHz频段路径损耗指数在视距通信(LOS:Line of Sight)时为2.53,在非视距通信(NLOS:No Line of Sight)时为3.3～3.8;同时,对COST231-WI路径损耗模型进行了修正,考虑到阴影衰落的影响,修正后的模型能较准确地预测接收功率,为系统覆盖范围预测提供参考。均方根时延扩展(Root Mean Square Delay Spread)的累积概率为0.9时,在0.5～0.8μs之间变化。均方根角度扩展(RMS Azimuth Spread)主要由发射天线位置和传播环境决定。展开更多
Extensive indoor channel measurements were conducted in Beijing with wideband multiple-input multiple-output （MIMO） sounder at 5.25 GHz. Both line-of-sight （LOS） and non-line-of-sight （NLOS） propagation were mea...Extensive indoor channel measurements were conducted in Beijing with wideband multiple-input multiple-output （MIMO） sounder at 5.25 GHz. Both line-of-sight （LOS） and non-line-of-sight （NLOS） propagation were measured in the indoor office and hotspot scenarios. On the basis of measured data, statistical channel characteristics are presented in this article, including the empirical path loss （PL） models, three excess delay parameters, circular azimuth spread （CAS）, and circular elevation spread （CES）. Comparative analysis of different propagation mechanisms in two scenarios is conducted. These values are significant for indoor coverage and technical research of MIMO and orthogonal frequency division multiplexing （OFDM） for the international mobile telecommunications-advanced （IMT-Advanced） system.展开更多
文摘Based on the point spread function （PSF） theory, the side-lobe extension direction of the impulse response in bistatic synthetic aperture radar （BSAR） is analyzed in detail; in addition, the corresponding autofocus in BSAR should be considered along iso-range direction, not the traditional azimuth resolution （AR） direction. The conclusion is verified by the computer simulation.
文摘为了给下一代无线通信系统(B3G:Beyond 3G)参数设计提供参考以及为算法仿真提供信道建模,针对国内城市室外环境不同的传播场景,在5.8 GHz频段和20 MHz信道带宽的测量条件下,进行了室外信道测量和研究。根据测量数据统计分析,5.8 GHz频段路径损耗指数在视距通信(LOS:Line of Sight)时为2.53,在非视距通信(NLOS:No Line of Sight)时为3.3～3.8;同时,对COST231-WI路径损耗模型进行了修正,考虑到阴影衰落的影响,修正后的模型能较准确地预测接收功率,为系统覆盖范围预测提供参考。均方根时延扩展(Root Mean Square Delay Spread)的累积概率为0.9时,在0.5～0.8μs之间变化。均方根角度扩展(RMS Azimuth Spread)主要由发射天线位置和传播环境决定。
基金the Hi-Tech Research and Development Program of China (2006AA01Z258), China Mobile Research Institute
文摘Extensive indoor channel measurements were conducted in Beijing with wideband multiple-input multiple-output （MIMO） sounder at 5.25 GHz. Both line-of-sight （LOS） and non-line-of-sight （NLOS） propagation were measured in the indoor office and hotspot scenarios. On the basis of measured data, statistical channel characteristics are presented in this article, including the empirical path loss （PL） models, three excess delay parameters, circular azimuth spread （CAS）, and circular elevation spread （CES）. Comparative analysis of different propagation mechanisms in two scenarios is conducted. These values are significant for indoor coverage and technical research of MIMO and orthogonal frequency division multiplexing （OFDM） for the international mobile telecommunications-advanced （IMT-Advanced） system.
