Abstract
A novel measurement‐based antenna‐height‐dependent statistical root‐mean‐square (RMS) delay spread model under indoor stair environment is proposed. In this model, the RMS delay spread is described as a log‐normal random variable with antenna‐height‐dependent parameters in both line‐of‐sight (LOS) and the non‐LOS (NLOS) areas. The environmental independence of the RMS delay spread distribution is shown first. Then, the parameters of the proposed model are extracted using least‐squares and maximum likelihood estimation. The accuracy of the proposed model is verified by the extensive measured data, and the mean values of the RMS delay spread are compared with those in other related works. Finally, the interdependence of RMS delay spread and the coherence bandwidth is investigated. The proposed model can be applied to the physical layer designs of small cells in future 5G and ubiquitous mobile communication systems. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
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