Human Body Shadowing at 28 GHz

It is well known that human body shadowing is a significant propagation effect in indoor communications especially at frequencies higher than 10 GHz. Thus, in this work, human body shadowing in directive short range channel is measured at 28 GHz. A distance of 10 m between the transmitting antenna and the receiving one is used in the measurement campaign. Two body orientations are used in this study. Four persons have participated in the measurement campaign as objects. Shadowing results are given for single person case and two person case. It is shown that maximum body shadowing occurs when the body is near to the transmitting or receiving antenna. Minimum shadowing occurs at almost the half of the distance between the transmitting and receiving antennas. It is shown that, body shadowing loss is low when the body is not in the center line between the transmitting and receiving antennas. At an antenna height of 1.2 m and 1.4 m, height and weight of the person under study affect the shadowing loss. In general, higher person and heavier person give a rise to higher shadowing loss. Crossing the line between the transmitting antenna and the receiving one, body shadowing loss of 10–36 dB is noticed. For the first orientation, shadowing loss due to two persons reaches to 36.5 dB when one of them moving along the line between the transmitting antenna and the receiving one and the other is at 5 ms from the transmitting antenna. A shadowing loss of 50.1 dB is observed when the third person is at 9.5 m from the transmitting antenna a d the fourth one is at 0.5 m from the transmitting antenna.

[1]  Aymen Ben Zineb,et al.  Body Shadowing and Furniture Effects for Accuracy Improvement of Indoor Wave Propagation Models , 2014, IEEE Transactions on Wireless Communications.

[2]  Takeshi Manabe,et al.  Estimation of propagation-path visibility for indoor wireless LAN systems under shadowing condition by human bodies , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[3]  Tetsuro Imai,et al.  Time-Varying Path-Shadowing Model for Indoor Populated Environments , 2010, IEEE Transactions on Vehicular Technology.

[4]  Teruya Fujii,et al.  Physical channel modeling for static mobile terminals in indoor environments , 2010, Proceedings of the Fourth European Conference on Antennas and Propagation.

[5]  Theodore S. Rappaport,et al.  Wideband Millimeter-Wave Propagation Measurements and Channel Models for Future Wireless Communication System Design , 2015, IEEE Transactions on Communications.

[6]  Ali Kara,et al.  Human body shadowing variability in short-range indoor radio links at 3–11 GHz band , 2009 .

[7]  Theodore S. Rappaport,et al.  Overview of Millimeter Wave Communications for Fifth-Generation (5G) Wireless Networks—With a Focus on Propagation Models , 2017, IEEE Transactions on Antennas and Propagation.

[8]  Z. Irahhauten,et al.  UWB channel measurements and results for wireless personal area networks applications , 2005, The European Conference on Wireless Technology, 2005..

[9]  Teruya Fujii,et al.  Dynamic Channel Modeling for Static Mobile Terminals in Indoor NLOS Environments , 2007, 2007 IEEE 66th Vehicular Technology Conference.

[10]  Jun-ichi Takada,et al.  Characterization of Body Shadowing Effects on Ultra-Wideband Propagation Channel , 2004 .

[11]  Theodore S. Rappaport,et al.  Propagation Models and Performance Evaluation for 5G Millimeter-Wave Bands , 2018, IEEE Transactions on Vehicular Technology.

[12]  Jianhua Zhang,et al.  Modelling of Human Body Shadowing Based on 28 GHz Indoor Measurement Results , 2016, 2016 IEEE 84th Vehicular Technology Conference (VTC-Fall).

[13]  Theodore S. Rappaport,et al.  Directional Radio Propagation Path Loss Models for Millimeter-Wave Wireless Networks in the 28-, 60-, and 73-GHz Bands , 2016, IEEE Transactions on Wireless Communications.

[14]  Jianping Pan,et al.  Modeling, validation and performance evaluation of body shadowing effect in ultra-wideband networks , 2009, Phys. Commun..

[15]  Petros Karadimas,et al.  Human Body Shadowing Characterization for 60-GHz Indoor Short-Range Wireless Links , 2013, IEEE Antennas and Wireless Propagation Letters.