Open AccessChannel Propagation Characteristics on the Performance of 4G Cellular Systems from High Altitude Platforms (HAPs)
Author(s) -
Kabiru Yusuf,
Dahiru Sani Shu'aibu,
Suleiman Aliyu Babale
Publication year - 2021
Publication title -
international journal of communication networks and information security
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.216
H-Index - 20
eISSN - 2076-0930
pISSN - 2073-607X
DOI - 10.54039/ijcnis.v13i3.5133
Subject(s) - transmitter , channel (broadcasting) , computer science , trajectory , base station , doppler effect , motion (physics) , altitude (triangle) , stability (learning theory) , effects of high altitude on humans , antenna (radio) , path loss , near space , wireless , simulation , control theory (sociology) , telecommunications , physics , mathematics , meteorology , geometry , control (management) , astronomy , artificial intelligence , machine learning
In this paper, we investigated the effect of different channel propagation characteristics on the performance of 4G systems from high altitude platforms (HAPs). The use of High-Altitude Platforms for communication purpose in the past focused mostly on the assumption that the platform is quasi stationary. The technical limitation of the assumption was that of ensuring stability in the positioning of the platform in space. The use of antenna steering and other approaches were proposed as a solution to the said problem. In this paper, we proposed a channel model which account for the motion of the platform. This was done by investigating the effect of Doppler shift on the carrier frequency as the signals propagate between the transmitter and receiver while the High-Altitude Platform is in motion. The basic free space model was used and subjected to the frequency variation caused by the continuous random shift due to the motion of the HAPs. The trajectory path greatly affects the system performance. A trajectory of 30km, 100km and 500km radii were simulated. An acute elevation angle was used in the simulation. The proposed model was also compared to two other channel models to illustrate its performance. The results show that the proposed model behave similar to the existing models except at base station ID 35 and 45 where the highest deviation of 20dBm was observed. Other stations that deviated were less than 2dBm.