Leveraging Depolarization to Increase the Link Reliability for Wireless Sensors Operating in Hyper-Rayleigh Environments

Abstract

Abstract-Wireless communications within enclosed environments such as aircraft and vehicles have been shown to experience fading with statistics that are worse than Rayleigh. Motivated by low-cost, low-complexity systems (e.g., wireless sensors) that may be deployed in such environments, this work explores the benefits of polarization diversity using very large data sets collected over a small area and over the 5-6 GHz band. The results also demonstrate that antennas capable of capturing depolarized signal components can significantly mitigate the harshest of fading environments.

Impact of Hub Location on the Performance of Wireless Body Area Networks for Fitness Applications

“…For > 8.2 dB the channel is Hyper-Rayleigh, i.e. worse than Rayleigh, this occurs typically in channels with two dominant paths [15]. Fig.…”

“…can be directly read from the empirical CPF plots as shown in Fig 4. Despite its simplicity, provides a good engineering insight into the nature of fading. For Rayleigh fading, = 8.2 dB whereas for benign Rician channels < 8.2 dB [15]. For > 8.2 dB the channel is Hyper-Rayleigh, i.e.…”

“…4. The metric chosen here is the 10% fade depth [15]. The metric compares the difference between the median value of and the 10% percentile of [15].…”

“…The metric chosen here is the 10% fade depth [15]. The metric compares the difference between the median value of and the 10% percentile of [15]. can be directly read from the empirical CPF plots as shown in Fig 4. Despite its simplicity, provides a good engineering insight into the nature of fading.…”

Deciwavelength-scale fade mitigation

“…It should be noted that most of the results presented herein are based on measurements taken with transmit and receive antennas oriented in a cross-polarized manner. While one might conclude this configuration would be a worst-case scenario, our recent work [3] demonstrated that for environments producing hyper-Rayleigh fading conditions, cross-polarized links are statistically more benign (i.e., tending to Rayleigh) than co-polarized links.…”