Comparison on Channel Characteristics at 3.5 GHz and 28 GHz

Zhongyuan Wu, Jianhua Zhang , Lei Tian, Zhixue Hu, Tao Jiang, Wei Li
2018 European Conference on Antennas and Propagation
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Abstract: In this paper, the channel measurements at 28 GHz and 3.5 GHz were conducted in the same indoor shopping mall scenario for the purpose of comparing the channel propagation characteristics between millimeter wave and centimeter wave.In the measurement of 28 GHz, a high gain steerable horn antenna is rotated with the step of 5 degrees in azimuth to synthesize the omnidirectional signal array for collecting the angular information at receiver (Rx) while a sector antenna at transmitter (Tx). And the raw data at 3.5 GHz is collected by a MIMO measurement equipment of an omnidirectional array (ODA) at Rx with an uniform array (UPA) at Tx. Based on the raw data and channel estimation algorithm space-alternating
generalized expectation-maximization (SAGE), Power Angular Spectrum (PAS) and Root Mean Square (RMS) Angular Spread of Azimuth of arrive (ASA) are calculated. After that, the PAS at each measured spot are compared and analyzed. Meanwhile, the relationship between RMS ASA and distance in the Line of sight (LoS) are observed at 3.5 GHz and 28 GHz. Finally, the fitted distributions and parameters of the RMS ASA at 3.5 GHz and 28 GHz are compared with the Model-A proposed in IMT-2020 channel model.


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