Indoor Propagation Modeling

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Ashraf Zetawe
Derar Mualla
Osama Dragmeh
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Project summary The last generation mobile access network system design needs more precise characterization of the radio channel and needs sophisticated propagation models, because of the decreasing cell sizes and of higher data rates.   In particular, the planning of the coverage in tunnels and indoor spaces causes design problems without these models.  Indoor propagation problems for wideband radio systems are widely investigated and one of the today applied approach of modeling is the ray-tracing, ray launching method.The high quality and reliability of the new indoor WLAN devices is possible thanks to the combination between MIMO technology and recently developed standard 802.11n that allows users to achieve up to 300 Mbps in a single transmission. This project intends to elucidate the comparison of these perspectives by evaluating an 802.11n MIMO band (2.4G) system which will focus on the operational performance of physical measurements and the filed strength distribution over an indoor environment.A 3D Shoot and Bounce Ray (SBR) method is applied to the radio propagation calculation. This project allows concluding that the reliability of an indoor WLAN environment using MIMO Technology is possible to achieve by both real world scenario and through realistic Simulation with a high accuracy comparison. This is important when measuring the reliability of an indoor environment with MIMO Technology in WLAN devices since the physical measurements usually result expensive and time consuming and therefore the simulation provides an accurate, affordable and time efficient tool to use as alternative.The 3D-SBR simulation model gives us a good estimation of how will signal propagate either in the indoor environment. The simulated results we had have high correlation with the measured values we estimated (up to 90% correlation in some regions). Thus we can consider the simulation as an accurate alternative for measurement which is time consuming and a frustrating process. Then investigate the path loss model called Multi-Wall-and-floor (MWF) model .It considers the penetration loss of walls and floor in indoor environment especially in our site. Several values for penetration loss for one and two transverse walls and floor are measured physically and by simulation. The proposed model is appropriate for realistic system simulation since it is easy to use. Because of simple application of the model to complex scenarios, which only needs the number of walls and floors traversed by the obstructed line of sight? The results motivate to develop a further model that takes into account the inter-action of penetrated walls and floors .tit is expected that the penetration loss of a wall increase as the number of wall increases and the model give us a MSE about 2 which means it give us excellent prediction of the signal strength .We found that the transmitter height can affect the propagation of the signal and in most cases the higher the transmitter the better performance the radio channel has. Excessive path loss within the home can prevent units from communicating with one another. Thus, it is useful to attempt to predict path loss, angel of arrival, and phase as a function of location within the home, also it could be very useful in terms of localization.Also we performed clustering to the results of the simulation for effective modeling of the channel and then we found the channel matrix for a certain receivers in order to find the capacity then we applied formula (2) to end up with a capacity of 52.4041 bits/sec/Hz.