Abstract
The various multipath mechanisms such as multiple reflections, diffraction, and scattering strongly degrade the radio signals in the indoor propagation environment. Although the deterministic ray tracing technique is widely used for modeling multiple reflections, it does not effectively describe the contributions of diffuse scattering from the rough surfaces. In this paper, measurements are performed in an indoor corridor environment with glass partitions to analyze the losses of WLAN mobile radio signals at 2.4 GHz. The path loss is estimated using the ray tracing deterministic N ray model. To improve its accuracy, the N ray model is merged with wavelet analysis to minimize the error between the model estimated and measured path loss. Although the wavelet merged ray tracing model has a better performance, there is a large variance in the reconstructed output. To have a better accuracy, the N ray model is modified by including the losses due to diffraction and scattering effects. The modified ray tracing model has an RMSE of 0.0590 and percentage relative error of 0.2009. The modified model is further optimized by including the statistical analysis of Rayleigh rough surface scattering to derive modified Fresnel’s reflection coefficients. The optimized model has the least values of RMSE (0.0385), standard deviation of error (0.0347) and percentage relative error (0.1312). The path loss estimated from the optimized model has the best agreement with the measured data and the values of the error metrics suggest the efficiency of the proposed optimized model.
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Cichon, D. J. IBP PIETZSCH GmbH, Germany Thomas Kürner 1, E-Plus Mobilfunk GmbH, Germany Propagation prediction models.
Loredo, S., Valle, L., & Torres, R. P. (2001). Accuracy analysis of GO/UTD radio-channel modeling in indoor scenarios at 1.8 and 2.5 GHz. IEEE Antennas and Propagation Magazine, 43(5), 37–51.
Ji, Z., et al. (2001). Efficient ray-tracing methods for propagation prediction for indoor wireless communications. IEEE Antennas and Propagation Magazine, 43(2), 41–49.
Remley, K. A., Anderson, H. R., & Andreas Weisshar, W.-K. (2000). Improving the accuracy of ray-tracing techniquesfor indoor propagation modeling. IEEE Transactions on Vehicular Technology, 49(6), 2350–2358.
Yarkony, N., & Blaunstein, N. (2007). Prediction of propagation charachteresitics in indoor radio communication environments. In The second European conference on antennas and propagation, 2007, EuCAP 2007. IET.
Doraiswamy, K. M., Merugu, L., & Jinaga, B. C. (2008). A quantitative analysis of GSM air interface based on radiating columns and prediction model. World Academy of Science, Engineering and Technology, International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering, 2(9), 1771–1776.
Rama Rao, T., & Dhanavanthan, B. (2013). RF propagation investigations at 915/2400 MHz in indoor corridor environments for wireless sensor communications. Progress in Electromagnetics Research B, 47, 359–381.
Saadane, R., & Wahbi, M. (2012). UWB indoor radio propagation modelling in presence of human body shadowing using ray tracing technique. International Journal of Communication Networks and Information Security, 4(2), 132.
Molisch, A. F. (2005). Ultrawideband propagation channels-theory, measurement, and modeling. IEEE transactions on vehicular technology, 54(5), 1528–1545.
Rappaport, T. S. (2002). Wireless communications: Principles and practice (Vol. 2). New York, NJ: Prentice Hall PTR.
Goldsmith, A. (2005). Wireless communications. Cambridge: Cambridge University Press.
Perez Fontan, F., & Marino Espineira, P. (2008). Modeling the wireless propagation channel: A simulation approach with matlab. London: Wiley Series on Wireless Communication & Mobile Computing.
Bhuvaneshwari, A., Hemalatha, R., & Satyasavithri, T. (2015). Path loss prediction analysis by ray tracing approach for NLOS indoor propagation. In 2015 international conference on signal processing and communication engineering systems (SPACES). IEEE.
Trueman, C. W. et al., (2000). Ray tracing algorithm for indoor propagation. In Proceedings of the progress in applied computational electromagnetics.
Vetterli, M., & Kovacevic, J. (1995). Wavelets and subband coding. No. LCAV-BOOK-1995-001. London: Prentice-Hall.
Burrus, C. S., Gopinath, R. A., & Guo, H. (1998). Introduction to wavelet and wavelet transforms. Englewood Cliffs, NJ: Prentice-Hall.
Akkaşlı, C. (2009). Methods for path loss prediction. In Reports from MSI, School of Mathematics and Systems Engineering, report (p. 9067).
Beyer, J. (2004). A GTD-based correction of the Epstein–Peterson method. IEEE Transactions on Antennas and Propagation, 52(3), 888–891.
http://web.mit.edu/8.02t/www/materials/StudyGuide/guide14.pdf.
Abedin, K. M., Islam, M. R., & Haider, A. F. M. Y. (2007). Computer simulation of Fresnel diffraction from rectangular apertures and obstacles using the Fresnel integrals approach. Optics and Laser Technology, 39(2), 237–246.
Blaunstein, N. (1999). Radio propagation in cellular networks. Norwood: Artech House, Inc.
Tsang, L., et al. (2004). Scattering of electromagnetic waves, numerical simulations (Vol. 25). London: Wiley.
Poon, A. S. Y, Tse, D. N. C., & Brodersen, R. W. (2006). Impact of scattering on the capacity, diversity, and propagation range of multiple-antenna channels. IEEE transactions on information theory, 52(3), 1087–1100.
Radoslaw, P., et al. (2007). Scattering analysis for the modeling of THz communication systems. IEEE Transactions on Antennas and Propagation, 55(11), 3002–3009.
Pinel, N., & Boulier, C. (2013). Electromagnetic wave scattering from random rough surfaces: Asymptotic models. London: Wiley.
Bhuvaneshwari, A., Hemalatha, R., & Sathyasavithri, T. (2013) Statistical tuning of the best suited prediction model for measurements made in Hyderabad City Of Southern India. In WCECS 2013, (Vol. 2) San Francisco.
Christopoulou, E. B., Skodras, A. N., & Georgakilas, A. A. (2002). Time series analysis of sunspot oscillations using the wavelet transform. In 2002 14th international conference on digital signal processing, 2002. DSP 2002 (Vol. 2) IEEE.
Haslett, C. (2008). Essentials of radio wave propagation. Cambridge: Cambridge University Press.
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The authors thank the Principal of Deccan College of Engineering And Technology, Dr M.A.Malik for permitting to conduct the experiment in the premises of the institution. The authors thank the students Shamshiya Tabassum and Zohair Mohammed for their assistance in collecting experimental data.
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Bhuvaneshwari, A., Hemalatha, R. & Satya Savithri, T. Development of an Optimized Ray Tracing Path Loss Model in the Indoor Environment. Wireless Pers Commun 96, 1039–1064 (2017). https://doi.org/10.1007/s11277-017-4220-5
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DOI: https://doi.org/10.1007/s11277-017-4220-5