Depolarization Due to Scattering on Walls in the 5 GHz Band

Abstract

A measurement campaign has been designed and developed to test the polarization behavior of different obstacles when a 5 GHz radio wave reaches their surfaces from different angles of incidence, with two orthogonal polarizations in transmission. The measurement outcomes have been analyzed by means of a matrix procedure, which is inspired in the polarimetric matrix formulation. This method allows the computation of depolarization indexes. The results highlight a strong depolarization of waves. A set of depolarization indexes for specular direction is given for several angles of incidence and three different materials, with direct application to wireless local area networks planning. These results are interesting for radio systems planning to double the channel capacity, if orthogonally polarized transmissions are used, or to mitigate the signal fading, if diversity techniques are applied at reception.

Accuracy of depolarization and delay spread predictions using advanced ray-based modeling in indoor scenarios

“…It has been shown in [4,5] that such tools are able to accurately predict narrowand wideband propagation characteristics in microcellular outdoor scenarios. However, to correctly reproduce the cross-polar discrimination, improvements are required [6,7] when, for example, transmitter and receiver are at a similar height and most of the reflected and diffracted rays are confined in the horizontal plane.…”

Effects of Antenna Characteristics on the Performance of Heart Rate Monitoring Radar Systems

“…Despite the fact that in our case multipath effects are not as strong as the radar cross section effects, they should still be considered. We employ the Ray Tracing Technique [36] as a tool to explain and investigate the multipath reflection contribution on the nonreciprocal behavior of the system. In our indoor scenario, there are various objects present which have comparable dimensions to the wavelength.…”

An Investigation Into the Diffraction Effects of Building Façade for Propagation Modelling

“…Their results show that ray tracing algorithm is applicable not only to UHF, but also to the millimetre band. Along the same line of interest, past researches were also conducted to examine the depolarization effects due to scattering on walls in the 5 GHz band [14] and the viability of site shielding forced by obstacles [15]. The reported findings contribute towards radio systems planning.…”

“…LoS propagation is the simplest type of propagation. The fields radiated by antennas of finite dimensions are spherical waves [14]. Assuming that there is a receiver placed z meter from the transmitter, and E(r0) = E 0 * e jφ 0 is the field at reference point r0, Equation (1) is used to calculate the LoS field at z meter from the transmitter: The wall-reflected field with a total ray path of Z meter can be calculated with perpendicular (horizontal) polarization reflection coefficients using Equation 2:…”