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

An investigation into the impact of antenna radiation patterns on the performance of a 3G mobile communication system provided a single high-altitude platform (HAP) is presented. Use of elliptical and circular beam antennas is examined for a 91-cell system. Crucial performance parameters are shown to be the mainlobe power roll-off and sidelobe level. It is presented that the optimum power roll-off from cell center to the cell edge ranges between 10-35 dB, which is dependent on the types of antennas used, sidelobe level, and antenna gain strategy employed. Elliptical beam antennas are proven to provide the best solution, but circular beam antennas with their gain adjusted to reduce the degree of cell overlap and compensate for increasing path loss are shown to provide similar performance, with the advantage that they are practically more realizable. It is shown that poorer overlap performance can be partially compensated for by an increased power roll-off at the cell edge, a strategy that is employed in the case of the gain adjusted circular beam antennas. The impact of cell radius and elevation angles is also assessed.

[1]  K. I. Kim.  CDMA cellular engineering issues , 1993 .

[2]  Yuriy Zakharov,et al.  Antenna array optimisation using semidefinite programming for cellular communications from HAPs , 2007 .

[3]  H. Leung,et al.  Performance evaluation of digital beamforming strategies for satellite communications , 2004, IEEE Transactions on Aerospace and Electronic Systems.

[4]  David Grace,et al.  High-altitude platforms for wireless communications , 2001 .

[5]  Dae-Sub Oh,et al.  Evaluation of interference effect into cellular system from high altitude platform station to provide IMT-2000 service , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[6]  Fabio Dovis,et al.  Integration of a HAP within a Terrestrial UMTS Network: Interference Analysis and Cell Dimensioning , 2003, Wirel. Pers. Commun..

[7]  David Grace,et al.  Effect of lateral displacement of a high-altitude platform on cellular interference and handover , 2005, IEEE Transactions on Wireless Communications.

[8]  David Grace,et al.  Improving the system capacity of broadband services using multiple high-altitude platforms , 2005, IEEE Transactions on Wireless Communications.

[9]  Tomás̆ Novosad,et al.  Radio Network Planning and Optimisation for Umts , 2006 .

[10]  Rahim Tafazolli,et al.  UMTS coverage planning using a high altitude platform station (HAPS) , 2002, The 5th International Symposium on Wireless Personal Multimedia Communications.

[11]  Jukka Lempiäinen,et al.  Impact of Antenna Configuration on UMTS Performance in High Altitude Platforms , 2007, 2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications.

[12]  Barry G. Evans,et al.  High elevation angle propagation results, applied to a statistical model and an enhanced empirical model , 1993 .

[13]  David Grace,et al.  Optimizing an array of antennas for cellular coverage from a high altitude platform , 2003, IEEE Trans. Wirel. Commun..

[14]  Pavel Pechac,et al.  Provision of 3G Mobile Services in Sparsely Populated Areas Using High Altitude Platforms , 2008 .

[15]  P. Pechac,et al.  Elevation Dependent Shadowing Model for Mobile Communications via High Altitude Platforms in Built-Up Areas , 2008, IEEE Transactions on Antennas and Propagation.

[16]  Rahim Tafazolli,et al.  Other-cell interference and reverse link capacity of high altitude platform station CDMA system , 2000 .

[17]  Pavel Pechac,et al.  Simulation of UMTS Capacity and Quality of Coverage in Urban Macro- and Microcellular Environment , 2005 .

[18]  Dimitrios I. Axiotis,et al.  The effect of platform instability on the system level performance of HAPS UMTS , 2004, IEEE Communications Letters.

[19]  Yang-Su Kim,et al.  Interference analysis of cellular system due to HAPS system to provide IMT-2000 service , 2002, The 5th International Symposium on Wireless Personal Multimedia Communications.

[20]  Rahim Tafazolli,et al.  Analytical investigation on sharing band overlaid high altitude platform station-terrestrial CDMA system , 2005 .