Effect of Antenna Power Roll-Off on the Performance of 3G Cellular Systems from High Altitude Platforms

2010 ◽  
Vol 46 (3) ◽  
pp. 1468-1477 ◽  
Author(s):  
Jaroslav Holis ◽  
David Grace ◽  
Pavel Pechac
Keyword(s):  
High Altitude ◽  
Cellular Systems ◽  
High Altitude Platforms

scholarly journals Channel Propagation Characteristics on the Performance of 4G Cellular Systems from High Altitude Platforms (HAPs)

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
Kabiru Yusuf ◽  
Dahiru Sani Shuaibu ◽  
Suleiman Aliyu Babale
Keyword(s):  
High Altitude ◽  
Channel Model ◽  
Elevation Angle ◽  
Base Station ◽  
Cellular Systems ◽  
Frequency Variation ◽  
Propagation Characteristics ◽  
Technical Limitation ◽  
Proposed Model ◽  
High Altitude Platforms

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.

Broadband from heaven [high altitude platforms]

2004 ◽  
Vol 2 (2) ◽  
pp. 18-23 ◽  
Author(s):  
S. Karapantazis ◽  
F.N. Pavlidou
Keyword(s):  
High Altitude ◽  
High Altitude Platforms

scholarly journals Advanced Communication Techniques and Applications for High-Altitude Platforms

2008 ◽  
Vol 2008 (1) ◽  
Author(s):  
Abbas Mohammed ◽  
Shlomi Arnon ◽  
David Grace ◽  
Marina Mondin ◽  
Ryu Miura
Keyword(s):  
High Altitude ◽  
Communication Techniques ◽  
High Altitude Platforms

scholarly journals GEOMETRICAL ANALYSIS OF HIGH ALTITUDE PLATFORMS CELLULAR FOOTPRINT

2007 ◽  
Vol 67 ◽  
pp. 263-274 ◽  
Author(s):  
Moawad Ibrahim Dessouky ◽  
Hamdy A. Sharshar ◽  
Yasser Attia Albagory
Keyword(s):  
High Altitude ◽  
Geometrical Analysis ◽  
High Altitude Platforms

scholarly journals Pengaruh Penggunaan Jenis Modulasi Sistem HAPS pada Layanan DVB-T

Elkawnie ◽  
2016 ◽  
Vol 2 (2) ◽  
pp. 177
Author(s):  
Sri Wahyuni
Keyword(s):  
High Altitude ◽  
Digital Video ◽  
Digital Video Broadcasting ◽  
Video Broadcasting ◽  
High Altitude Platforms

DVB-T (Digital Video Broadcasting- Terresrial) merupakan sebuah standar terbuka dalam transmisi video digital yang telah diakui secara internasional dikeluarkan oleh ETSI. Pada penelitian ini akan menganalisis pengaruh pemilihan jenis modulasi yang digunakan terhadap performansi layanan DVB-T pada sistem High Altitude Platforms Station (HAPS). HAPS yang dikenal sebagai stratospheric broadband adalah sebuah standar infrastruktur telekomunikasi yang serupa dengan satellite, yang ditempatkan di lapisan stratosfer. HAPS dikembangkan untuk menjalankan layanan serupa satellite dengan biaya yang lebih hemat, waktu perealisasian yang jauh lebih pendek dan memiliki cakupan yang jauh lebih besar dibandingkan dengan infrastuktur terestial saat ini. Kanal HAPS dapat menyediakan hubungan LOS antara platform HAPS dengan user sehingga dapat disimulasikan dengan kanal rician. Berdasarkan hasil penelitian, performansi layanan DVB-T pada sistem HAPS dipengaruhi oleh jenis modulasi dan mode kerja yang digunakan, penggunaan modulasi QPSK dengan mode kerja 8K memberikan performansi paling baik, dengan memenuhi nilai BER yang telah ditentukan yaitu lebih kecil dari 10-4

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