A Radio Channel Sounder for Mobile Millimeter-Wave Communications: System Implementation and Measurement Assessment

We describe a state-of-the-art channel sounder to support channel-model development for mobile millimeterwave (mm-wave) communications. The system can measure the complex amplitude, delay, and angle of arrival of the multipath components of indoor and outdoor channels. Specifically, a custom multiplexer (MUX) records the channel impulse response across a 16-element receive (RX) antenna array in 65.5 μs, while the channel is static. The delay resolution of the system is 1 ns and, because the elements are oriented in a 3-D space, both azimuth and elevation angles can be extracted. The robust link budget, comprising high-gain directional RX antennas, enables indoor link measurement beyond 150 m in line-of-sight and 20 m in non-line-of-sight conditions. The RX array is mounted on a location-aware robot, which is battery operated. Combined with the speed of the MUX, untethered acquisition of mobile-channel data is possible. To the best of our knowledge, this paper contributes the first sounder that is capable of mobile measurements at mm-wave frequencies. The hardware implementation of a functional 83.5-GHz system is described in this paper, and some illustrative results, including small-scale statistics and Doppler, are presented.

[1]  Theodore S. Rappaport,et al.  Millimeter Wave Mobile Communications for 5G Cellular: It Will Work! , 2013, IEEE Access.

[2]  Zhouyue Pi,et al.  An introduction to millimeter-wave mobile broadband systems , 2011, IEEE Communications Magazine.

[3]  Alberto Valdes-Garcia,et al.  60GHz Technology for Gbps WLAN and WPAN: From Theory to Practice , 2010 .

[4]  Camillo Gentile,et al.  A Comprehensive Spatial-Temporal Channel Propagation Model for the Ultrawideband Spectrum 2–8 GHz , 2010, IEEE Transactions on Antennas and Propagation.

[5]  Kate A. Remley,et al.  Calibration of millimeter-wave channel sounders for super-resolution multipath component extraction , 2016, 2016 10th European Conference on Antennas and Propagation (EuCAP).

[6]  Theodore S. Rappaport,et al.  Millimeter-Wave Enhanced Local Area Systems: A High-Data-Rate Approach for Future Wireless Networks , 2014, IEEE Journal on Selected Areas in Communications.

[7]  Norman C. Beaulieu,et al.  New Expressions for TWDP Fading Statistics , 2013, IEEE Wireless Communications Letters.

[8]  Robert W. Heath,et al.  Five disruptive technology directions for 5G , 2013, IEEE Communications Magazine.

[9]  Theodore S. Rappaport,et al.  Millimeter Wave Wireless Communications , 2014 .

[10]  Kenneth Stewart,et al.  Enabling technologies and architectures for 5G wireless , 2014, 2014 IEEE MTT-S International Microwave Symposium (IMS2014).

[11]  P. Constantinou,et al.  Indoor channel measurements and characterization at 60 GHz for wireless local area network applications , 2004, IEEE Transactions on Antennas and Propagation.

[12]  H. Hashemi,et al.  The indoor radio propagation channel , 1993, Proc. IEEE.

[13]  H.T. Friis,et al.  A Note on a Simple Transmission Formula , 1946, Proceedings of the IRE.

[14]  Desmond P. Taylor,et al.  A Statistical Model for Indoor Multipath Propagation , 2007 .

[15]  Juliane Hahn,et al.  Spread Spectrum Systems With Commercial Applications , 2016 .

[16]  Frederick W. Vook,et al.  MIMO and beamforming solutions for 5G technology , 2014, 2014 IEEE MTT-S International Microwave Symposium (IMS2014).

[17]  T. Kosugi,et al.  MM-wave long-range wireless systems , 2009, IEEE Microwave Magazine.

[18]  Roman Maslennikov,et al.  Experimental investigations of 60 GHz WLAN systems in office environment , 2009, IEEE Journal on Selected Areas in Communications.

[19]  Hiroshi Harada,et al.  Impulse Response Model and Parameters for Indoor Channel Modeling at 60GHz , 2010, 2010 IEEE 71st Vehicular Technology Conference.

[20]  Jeffery Wepman.  Comparison of wideband propagation in the 902-928 and 1850-1990 MHz bands in various macrocellular environments , 1993 .

[21]  Kate A. Remley,et al.  Radio channel sounders for modeling mobile communications at 28 GHz, 60 GHz and 83 GHz , 2015, Global Symposium on Millimeter-Waves (GSMM).

[22]  Theodore S. Rappaport,et al.  38 GHz and 60 GHz angle-dependent propagation for cellular & peer-to-peer wireless communications , 2012, 2012 IEEE International Conference on Communications (ICC).

[23]  Thomas Zwick,et al.  Wideband channel sounder with measurements and model for the 60 GHz indoor radio channel , 2005, IEEE Transactions on Vehicular Technology.