Abstract
Accurately characterizing the wireless small-scale fading channel has been a challenging task in the wireless communication era due to the surrounding environment. Therefore, this paper introduces a new technique to experimentally characterize the small-scale fading taking under consideration real environmental conditions. By conducting a two dimensional measurement while the mobile receiver is moving; a more accurate channel will be achieved. Two-dimensional measurement refers to collecting data from the receiver along the x and y direction. The two-dimensional measurement data contain far more information than a one-dimensional data collected. In order to represent the small-scale channel along with the real environmental conditions, new approaches are necessary to configure the two-dimensional system and to analyze the 2D data. The new approach this paper introduces for the characterization is that the measurements are conducted on a receiver while it is moving in a two dimensional manner, under different scenarios, Line-of-sight, Non-line-of-sight, and Two-wave-Diffuse Power. The experiment was conducted in a 7 meters long by 4 meters wide room, wherein the distance between the transmitter antenna and receiver is about 3 meters. Those scenarios represent different real-time conditions where obstacles differ from one scenario to another. For example, the line of sight scenario assumes there a clear line of sight between transmitter and receiver, Non line of sight assumes many obstacles between the transmitter and receiver, i.e. walls, cabinets, etc. and Two Wave Diffuse Power assumes a metallic reflector surrounding the receiver. The experiment showed more accurate results when compared to the one dimensional measurement that has been done in the past where receiver is moving in one direction and also receiver being fixed where a constructive and destructive interference is not captured. The two dimensional measurement technique, i.e. capturing data while receiver moving in both x and y directions, provided essential information regarding the constructive and destructive interference patterns caused by the interaction between the receiver while moving and the obstacles surrounding the receiver.
Highlights
Characterizing the wireless small-scale fading channel has been a challenging task in the wireless communication era
Two-Wave Diffuse Power (TWDP) has a non-specular component with numerous individual waves, each carrying power that is negligible compared to the total average power of either of two specular components as reported in [1]
This paper has presented a new measurement technique, 2D measurements while the receiver is in motion in both x and y directions, in which an improved characterization of the small-scale fading 2D was achieved
Summary
Characterizing the wireless small-scale fading channel has been a challenging task in the wireless communication era. Due to the one dimensional measurement, there was break down for realistic situations where there are not enough data This task is principally illuminating a non-standard fading behavior in a close-in environments. When the receiver is being mounted or fixed in a location, the measured data will not show much of the constructive and destructive interference which is caused by the obstacles within the room in relation to the movement of the wireless device i.e. receiver. Techniques in this paper will capture data due to angle variation, since the receiver is moving in two directions, constructive and destructive interferences caused by the obstacles within the room in relation to the movement of the receiver. Different modeling schemes were investigated in the 2D environment as well as the movement of the wireless device
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