Characterization of the Angle, Delay and Polarization of Multipath Signals for Indoor Environments

Abstract

Abstract-A high-resolution channel sounding technique has been used to investigate the cross-polarization of electromagnetic waves in the 5-6 GHz band. Experiments were performed in two non-line-of-sight indoor locations, and it was found that there is a strong dependency of the cross-polarization of multipath components on the elevation angle-of-arrival. For a vertically polarized transmitting antenna, clusters of co-polarized multipath components were confined predominantly to the region around the horizontal plane that contains the virtual line-of-sight between transmitter and receiver. In contrast, cross-polarized signals were detected for a variety of elevation angles with considerable power levels. The surroundings of the receiver were identified as the principal source of depolarized signals. In addition, time dispersion analysis of the multipath signals led to the determination of the AoAs where there is a strong correspondence between co-and cross-polarized signals as a consequence of the partial depolarization of MPCs. This work supports the exploitation of the joint space and polarization diversities in indoor propagation scenarios to improve the system performance.

Angle and Time of Arrival Statistics of a Three Dimensional Geometrical Scattering Channel Model for Indoor and Outdoor Propagation Environments

“…Comparison of AOA expression in the azimuth angle with: (a) Janaswamy's 2D model [4] and measurements [22], (b) Janaswamy's model [4] and measurements [25], (c) Khan's model [9] and measurements [24] and (d) Jiang's model [8] and measurements [26].…”

“…Therefore, it becomes more realistic to consider that incoming multipath signals take place within both the azimuth and elevation angles. In addition, several indoor and outdoor channel measurements [18][19][20][21][22] demonstrate that the angular spread of the received multipath signals are observed with a relatively wide range in elevation angle in contrast with the 2D models' assumptions. However, the published geometrical scattering channel models developed for such environments, i.e., outdoor picocellular and indoor environments, are 2D models [1-3, 8, 9, 12, 13].…”

Practical challenges of IR-UWB based ranging in harsh industrial environments

“…Furthermore, walls act as lossy guides favoring co-polarized signals, so the power of cross-polarized MPC components decays even faster [25].…”

Experimental Investigation of Space and Polarization Characteristics of a Subway-Like Tunnel Channel

“…To the best of our knowledge, the angle-of-arrival (AoA) of crosspolarized signals in tunnels are not reported yet. The joint space and polarization diversities have been proposed as an attractive method to boost the MIMO system capacity [12]. In this research, we fill the gap by investigating the joint space and polarization channel characterization.…”