Wireless Personal Communications: An International Journal
Integration of a HAP within a Terrestrial UMTS Network: InterferenceAnalysis and Cell Dimensioning
Wireless Personal Communications: An International Journal
Optimizing an array of antennas for cellular coverage from a high altitude platform
IEEE Transactions on Wireless Communications
Improving the system capacity of broadband services using multiple high-altitude platforms
IEEE Transactions on Wireless Communications
WCDMA uplink interference assessment from multiple high altitude platform configurations
EURASIP Journal on Wireless Communications and Networking - Advanced Communication Techniques and Applications for High-Altitude Platforms
EURASIP Journal on Wireless Communications and Networking - Advanced Communication Techniques and Applications for High-Altitude Platforms
Performance of a Multiple HAP System Employing Multiple Polarization
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
Hi-index | 0.00 |
This paper examines the behaviour of system capacity in High Altitude Platform (HAP) communications systems as a function of antenna directivity and HAP positioning. Antenna models for the user and the HAP are discussed, and it is shown that a flat sidelobe antenna pattern is suitable for modelling multiple HAP constellations when HAPs are located outside the coverage area. Using a single HAP scenario it is shown how narrowing the HAP antenna beamwidth may give better downlink Carrier-to-Noise Ratio (CNR) over the most of the coverage area. The roles of the HAP antenna beamwidth, HAP antenna pointing and HAP spacing radius are investigated. An equation is derived to determine the location of the peak CNR combined with these three parameters. A more complex multiple HAP scenario where all HAP's operate on the same channel and interfere with each other is also assessed in terms of the Carrier to Interference plus Noise Ratio (CINR) and spectral efficiency. It is shown that locating HAPs at a specific spacing radius that is outside the coverage area can improve performance. Using these techniques the combined bandwidth efficiency is shown to increase almost pro-rata when the number of HAPs is increased up to 16.