An Estimate of Interference Effect on Horizontally Polarized Signal Transmission in the Tropical Locations: A Comparison of Rain-Cell Models

Abstract

With the recent growth in the use of satellites for an increasing range of devices, services, applications and users, there is a need to optimize the signal received for availability, reliability and tolerance to interference. A lot of prediction models have been used in recent times to estimate intersystem interference due to hydrometeor scattering on vertically polarized microwave signals into the receiver of earth-space communications systems operating at the same frequency. The horizontal polarization is usually not investigated because coupling between the transmitting and receiving systems is much less than in vertical polarization. Much as this is true in the temperate regions, the nature and characteristics of tropical rainfall which are quite distinct from the temperate rainfall, means that the horizontal polarization when transmitted should be investigated for hydrometeor induced interference in tropical regions. This present work computes transmission loss on horizontally polarized signals based on two models (Awaka and Capsoni). The results obtained are compared and it is observed that there is only a difference of 1 dB in the transmission loss between the models. However, at higher frequency (> 20 GHz), the Capsoni model does not produce values for the transmission loss L, while Awaka model predict a low interference at various antenna gain for percentages of time > 0.1%.

Analysis of Bistatic Scattering Due to Hydrometeors on SHF and Ehf Links in a Subtropical Location: A Comparative Study Based on the Rain Cell Models

“…Hence, the Awaka model predicts a low interference at various antenna gains for these percentages of time at short path lengths. The same was observed in the tropical region in the work of [6].…”

“…The weak signal from the satellite is susceptible to severe interference from a strong terrestrial system operating in its neighborhood at the same frequency if the beam canters intersect and contain precipitating particles [4][5][6].…”

Estimation of Effective Transmission Loss Due to Subtropical Hydrometeor Scatters using a 3D Rain Cell Model for Centimeter and Millimeter Wave Applications

“…At longer path lengths of about 200 km, the graph shows a sinusoidal trend. At frequencies greater than 10 GHz, Le decreases (increase in interference) with increasing frequency except at the frequency window of [16][17][18][19][20][21][22][23][24] GHz where there is a slight increase due to the radar reflectivity factor. The decrease in Le with increasing frequency at the short path length may be due to the contribution of the higher increase of attenuation along the wanted signal.…”

“…In the tropical region, the subject also received some attention mostly in Nigeria [2,3,[13][14][15][16][17]. However, the subject is just recently receiving attention in the subtropical region.…”

Uplink Co-Channel and Co-Polar Interference Statistical Distribution Between Adjacent Broadband Satellite Networks

“…This paper investigates the aggravation of the uplink adjacent satellite network interference due to spatial inhomogeneity of rainfall medium. Rain attenuation exhibits stochastic behavior both in time and space and can be generally considered as inhomogeneous [4][5][6][7][8][9].…”