The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Chun Pan - One of the best experts on this subject based on the ideXlab platform.
-
ICNC - Experimental investigation of Elevation Angles and impacts on channel capacity in urban microcell
2015 International Conference on Computing Networking and Communications (ICNC), 2015Co-Authors: Chun Pan, Jianhua ZhangAbstract:Three dimensional (3D) Multiple Input and Multiple Output (MIMO) is one of the most promising techniques for the 5th Generation (5G) mobile communication systems. Thus there is an urgent need for one reliable 3D MIMO channel model to research and evaluate 3D MIMO techniques. In this paper, we focus on the statistic characteristics of Elevation Angle in urban microcell (UMi) and propose a novel Elevation Angle modeling methodology. In order to capture enough 3D channel characteristics, field 3D channel measurements at 3.5 GHz with 100 MHz bandwidth are conducted in UMi scenario. Based on the existing 3D channel model frame, the proposed Elevation Angle model is introduced and the updated 3D channel model is used to perform channel capacity analysis. Comparisons among the updated 3D channel model, the traditional two dimensional (2D) channel model and the field 3D channel data are made. The updated 3D channel model obtains obvious capacity gain compared with 2D channel model. The proposed Elevation Angle model and the updated 3D channel model can optimally match the channel capacity of the real 3D channel data.
-
three dimensional fading channel models a survey of Elevation Angle research
IEEE Communications Magazine, 2014Co-Authors: Jianhua Zhang, Chun Pan, Feng Pei, Guangyi Liu, Xiang ChengAbstract:The explosive increase of mobile traffic demands higher spectrum efficiency for future wireless communications. By properly configuring a 2-dimensional (2D) antenna array at the basestation, the system capacity can be improved with 3 dimensional (3D) multiuser Multiple Input and Multiple Output (MIMO) techniques without modifying the terminal antennas. Therefore, the signal will propagate in a 3D space with Angle dispersion in both horizontal and vertical planes. Due to its role in facilitating research and development of 3D MIMO technology, the 3D fading channel model is receiving increasing attention. However, existing fading channel models mostly focus on the azimuth Angle characteristics, while neglecting the Elevation Angle impact. This article provides a state of the art review on 3D fading channel models, emphasizing research related to the Elevation Angle. We also report some recent field measurements for 3D MIMO and investigate the comprehensive propagation characteristics of the Elevation Angle.
-
Elevation Angle characteristics of urban wireless propagation environment at 3 5 ghz
Vehicular Technology Conference, 2013Co-Authors: Feng Pei, Jianhua Zhang, Chun PanAbstract:It is known that channel model of propagation characteristics are crucial in the research and evaluation of three-dimensional multiple-input multiple-output (3D-MIMO) technique, especially the Elevation Angle (EA) model. In this paper, the results of 3D-MIMO channel measurement in the urban macro-cell (UMA) scenario at 3.5 GHz are presented. Based on the measurement data, it is find that the mean value of Elevation Angle has a offset Angle to line-of-sight (LOS) Angle especially in not-line-of- sight (NLOS) situation. And the offset Angle is depend on the azimuth distance between BS and MS which can be modeled as a function that use distance as a parameter. A novel way to model mean Angle of Elevation Angle is proposed at the end of this paper. The relation between Circular angular spread (CAS) and distance is also studied, the measurement result shows that the effects caused by distance can be neglected.
-
VTC Fall - Elevation Angle Characteristics of Urban Wireless Propagation Environment at 3.5 GHz
2013 IEEE 78th Vehicular Technology Conference (VTC Fall), 2013Co-Authors: Feng Pei, Jianhua Zhang, Chun PanAbstract:It is known that channel model of propagation characteristics are crucial in the research and evaluation of three-dimensional multiple-input multiple-output (3D-MIMO) technique, especially the Elevation Angle (EA) model. In this paper, the results of 3D-MIMO channel measurement in the urban macro-cell (UMA) scenario at 3.5 GHz are presented. Based on the measurement data, it is find that the mean value of Elevation Angle has a offset Angle to line-of-sight (LOS) Angle especially in not-line-of- sight (NLOS) situation. And the offset Angle is depend on the azimuth distance between BS and MS which can be modeled as a function that use distance as a parameter. A novel way to model mean Angle of Elevation Angle is proposed at the end of this paper. The relation between Circular angular spread (CAS) and distance is also studied, the measurement result shows that the effects caused by distance can be neglected.
Feng Pei - One of the best experts on this subject based on the ideXlab platform.
-
three dimensional fading channel models a survey of Elevation Angle research
IEEE Communications Magazine, 2014Co-Authors: Jianhua Zhang, Chun Pan, Feng Pei, Guangyi Liu, Xiang ChengAbstract:The explosive increase of mobile traffic demands higher spectrum efficiency for future wireless communications. By properly configuring a 2-dimensional (2D) antenna array at the basestation, the system capacity can be improved with 3 dimensional (3D) multiuser Multiple Input and Multiple Output (MIMO) techniques without modifying the terminal antennas. Therefore, the signal will propagate in a 3D space with Angle dispersion in both horizontal and vertical planes. Due to its role in facilitating research and development of 3D MIMO technology, the 3D fading channel model is receiving increasing attention. However, existing fading channel models mostly focus on the azimuth Angle characteristics, while neglecting the Elevation Angle impact. This article provides a state of the art review on 3D fading channel models, emphasizing research related to the Elevation Angle. We also report some recent field measurements for 3D MIMO and investigate the comprehensive propagation characteristics of the Elevation Angle.
-
Elevation Angle characteristics of urban wireless propagation environment at 3 5 ghz
Vehicular Technology Conference, 2013Co-Authors: Feng Pei, Jianhua Zhang, Chun PanAbstract:It is known that channel model of propagation characteristics are crucial in the research and evaluation of three-dimensional multiple-input multiple-output (3D-MIMO) technique, especially the Elevation Angle (EA) model. In this paper, the results of 3D-MIMO channel measurement in the urban macro-cell (UMA) scenario at 3.5 GHz are presented. Based on the measurement data, it is find that the mean value of Elevation Angle has a offset Angle to line-of-sight (LOS) Angle especially in not-line-of- sight (NLOS) situation. And the offset Angle is depend on the azimuth distance between BS and MS which can be modeled as a function that use distance as a parameter. A novel way to model mean Angle of Elevation Angle is proposed at the end of this paper. The relation between Circular angular spread (CAS) and distance is also studied, the measurement result shows that the effects caused by distance can be neglected.
-
VTC Fall - Elevation Angle Characteristics of Urban Wireless Propagation Environment at 3.5 GHz
2013 IEEE 78th Vehicular Technology Conference (VTC Fall), 2013Co-Authors: Feng Pei, Jianhua Zhang, Chun PanAbstract:It is known that channel model of propagation characteristics are crucial in the research and evaluation of three-dimensional multiple-input multiple-output (3D-MIMO) technique, especially the Elevation Angle (EA) model. In this paper, the results of 3D-MIMO channel measurement in the urban macro-cell (UMA) scenario at 3.5 GHz are presented. Based on the measurement data, it is find that the mean value of Elevation Angle has a offset Angle to line-of-sight (LOS) Angle especially in not-line-of- sight (NLOS) situation. And the offset Angle is depend on the azimuth distance between BS and MS which can be modeled as a function that use distance as a parameter. A novel way to model mean Angle of Elevation Angle is proposed at the end of this paper. The relation between Circular angular spread (CAS) and distance is also studied, the measurement result shows that the effects caused by distance can be neglected.
Jianhua Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Propagation characteristics of Elevation Angles and three dimensional fading channel model with Angle offset
China Communications, 2019Co-Authors: Lei Tian, Jianhua Zhang, Haifeng Tan, Pan Tang, Guangyi LiuAbstract:Three dimensional (3D) Multiple Input and Multiple Output (MIMO) is one of the most promising techniques for the 5th generation (5G) mobile communication system. To support its research, the property of Elevation Angle in 3D channel model should be accurately modeled. Conventionally, 3D channel is modeled with an assumption that the mean Elevation Angle of multipaths is coincided with the line-of-sight (LOS) direction. In order to investigate its authenticity and give the reliable 3D channel model, extensive 3D multiple antenna field channel measurements with 100 MHz bandwidth are conducted in three typical scenarios, including outdoor to indoor(O2I), urban microcell (UMi) and urban macrocell (UMa). The statistical characteristics and parameters are extracted and analyzed based on the measurement data. It is found that the assumption holds in the LOS condition. However, for non-line-of-sight (NLOS) condition, a difference exists between the mean Elevation Angle and the direction connecting transmitter and receiver, which is defined as the Elevation Angle offset. Then, the eigenvalue distribution and capacity are compared between the reconstructed 3D channels with and without Elevation Angle offset. Results show that the performance of 3D channel with Angle offset fits the measurement data better whereas that without Angle offset is underestimated.
-
ICNC - Experimental investigation of Elevation Angles and impacts on channel capacity in urban microcell
2015 International Conference on Computing Networking and Communications (ICNC), 2015Co-Authors: Chun Pan, Jianhua ZhangAbstract:Three dimensional (3D) Multiple Input and Multiple Output (MIMO) is one of the most promising techniques for the 5th Generation (5G) mobile communication systems. Thus there is an urgent need for one reliable 3D MIMO channel model to research and evaluate 3D MIMO techniques. In this paper, we focus on the statistic characteristics of Elevation Angle in urban microcell (UMi) and propose a novel Elevation Angle modeling methodology. In order to capture enough 3D channel characteristics, field 3D channel measurements at 3.5 GHz with 100 MHz bandwidth are conducted in UMi scenario. Based on the existing 3D channel model frame, the proposed Elevation Angle model is introduced and the updated 3D channel model is used to perform channel capacity analysis. Comparisons among the updated 3D channel model, the traditional two dimensional (2D) channel model and the field 3D channel data are made. The updated 3D channel model obtains obvious capacity gain compared with 2D channel model. The proposed Elevation Angle model and the updated 3D channel model can optimally match the channel capacity of the real 3D channel data.
-
three dimensional fading channel models a survey of Elevation Angle research
IEEE Communications Magazine, 2014Co-Authors: Jianhua Zhang, Chun Pan, Feng Pei, Guangyi Liu, Xiang ChengAbstract:The explosive increase of mobile traffic demands higher spectrum efficiency for future wireless communications. By properly configuring a 2-dimensional (2D) antenna array at the basestation, the system capacity can be improved with 3 dimensional (3D) multiuser Multiple Input and Multiple Output (MIMO) techniques without modifying the terminal antennas. Therefore, the signal will propagate in a 3D space with Angle dispersion in both horizontal and vertical planes. Due to its role in facilitating research and development of 3D MIMO technology, the 3D fading channel model is receiving increasing attention. However, existing fading channel models mostly focus on the azimuth Angle characteristics, while neglecting the Elevation Angle impact. This article provides a state of the art review on 3D fading channel models, emphasizing research related to the Elevation Angle. We also report some recent field measurements for 3D MIMO and investigate the comprehensive propagation characteristics of the Elevation Angle.
-
Elevation Angle characteristics of urban wireless propagation environment at 3 5 ghz
Vehicular Technology Conference, 2013Co-Authors: Feng Pei, Jianhua Zhang, Chun PanAbstract:It is known that channel model of propagation characteristics are crucial in the research and evaluation of three-dimensional multiple-input multiple-output (3D-MIMO) technique, especially the Elevation Angle (EA) model. In this paper, the results of 3D-MIMO channel measurement in the urban macro-cell (UMA) scenario at 3.5 GHz are presented. Based on the measurement data, it is find that the mean value of Elevation Angle has a offset Angle to line-of-sight (LOS) Angle especially in not-line-of- sight (NLOS) situation. And the offset Angle is depend on the azimuth distance between BS and MS which can be modeled as a function that use distance as a parameter. A novel way to model mean Angle of Elevation Angle is proposed at the end of this paper. The relation between Circular angular spread (CAS) and distance is also studied, the measurement result shows that the effects caused by distance can be neglected.
-
VTC Fall - Elevation Angle Characteristics of Urban Wireless Propagation Environment at 3.5 GHz
2013 IEEE 78th Vehicular Technology Conference (VTC Fall), 2013Co-Authors: Feng Pei, Jianhua Zhang, Chun PanAbstract:It is known that channel model of propagation characteristics are crucial in the research and evaluation of three-dimensional multiple-input multiple-output (3D-MIMO) technique, especially the Elevation Angle (EA) model. In this paper, the results of 3D-MIMO channel measurement in the urban macro-cell (UMA) scenario at 3.5 GHz are presented. Based on the measurement data, it is find that the mean value of Elevation Angle has a offset Angle to line-of-sight (LOS) Angle especially in not-line-of- sight (NLOS) situation. And the offset Angle is depend on the azimuth distance between BS and MS which can be modeled as a function that use distance as a parameter. A novel way to model mean Angle of Elevation Angle is proposed at the end of this paper. The relation between Circular angular spread (CAS) and distance is also studied, the measurement result shows that the effects caused by distance can be neglected.
Andreas F. Molisch - One of the best experts on this subject based on the ideXlab platform.
-
The impact of Elevation Angle on MIMO capacity
IEEE International Conference on Communications, 2006Co-Authors: Mansoor Shafi, Aris L. Moustakas, Peter J Smith, Min Zhang, Andreas F. MolischAbstract:Many channel models for MIMO systems have appeared in the literature. However, with the exception of a few recent results, they are largely focussed on two dimensional (2D) propagation, i.e., propagation in the horizontal plane, and the impact of Elevation Angle is not considered. The assumption of 2D propagation breaks down when in some propagation environments the Elevation Angle distribution is significant. Consequently, the estimation of ergodic capacity assuming a 2D channel coefficient alone can lead to erroneous results. In this paper, for cross polarized channels, we define a composite channel model and channel coefficient that takes into account both 2D and 3D propagation. Using this composite channel coefficient we assess the ergodic channel capacity and discuss its sensitivity to a variety of different azimuth and Elevation power distributions and other system parameters.
-
ICC - The Impact of Elevation Angle on MIMO Capacity
2006 IEEE International Conference on Communications, 2006Co-Authors: Mansoor Shafi, Aris L. Moustakas, Peter J Smith, Min Zhang, Andreas F. MolischAbstract:Many channel models for MIMO systems have appeared in the literature. However, with the exception of a few recent results, they are largely focussed on two dimensional (2D) propagation, i.e., propagation in the horizontal plane, and the impact of Elevation Angle is not considered. The assumption of 2D propagation breaks down when in some propagation environments the Elevation Angle distribution is significant. Consequently, the estimation of ergodic capacity assuming a 2D channel coefficient alone can lead to erroneous results. In this paper, for cross polarized channels, we define a composite channel model and channel coefficient that takes into account both 2D and 3D propagation. Using this composite channel coefficient we assess the ergodic channel capacity and discuss its sensitivity to a variety of different azimuth and Elevation power distributions and other system parameters.
Zhiyuan Zheng - One of the best experts on this subject based on the ideXlab platform.
-
inclusion of solar Elevation Angle in land surface albedo parameterization over bare soil surface
Journal of Advances in Modeling Earth Systems, 2017Co-Authors: Zhiyuan Zheng, Zhigang Wei, Zhiping Wen, Wenjie Dong, Xiaohang Wen, Xian Zhu, Chen Chen, Dongdong YanAbstract:Land surface albedo is a significant parameter for maintaining a balance in surface energy. It is also an important parameter of bare soil surface albedo for developing land surface process models that accurately reflect diurnal variation characteristics and the mechanism behind the solar spectral radiation albedo on bare soil surfaces and for understanding the relationships between climate factors and spectral radiation albedo. Using a data set of field observations, we conducted experiments to analyze the variation characteristics of land surface solar spectral radiation and the corresponding albedo over a typical Gobi bare soil underlying surface and to investigate the relationships between the land surface solar spectral radiation albedo, solar Elevation Angle, and soil moisture. Based on both solar Elevation Angle and soil moisture measurements simultaneously, we propose a new two-factor parameterization scheme for spectral radiation albedo over bare soil underlying surfaces. The results of numerical simulation experiments show that the new parameterization scheme can more accurately depict the diurnal variation characteristics of bare soil surface albedo than the previous schemes. Solar Elevation Angle is one of the most important factors for parameterizing bare soil surface albedo and must be considered in the parameterization scheme, especially in arid and semiarid areas with low soil moisture content. This study reveals the characteristics and mechanism of the diurnal variation of bare soil surface solar spectral radiation albedo and is helpful in developing land surface process models, weather models, and climate models.
