MIMO Applications for Interference Mitigation in Multiple High Altitude Platform WCDMA Systems

In this paper we investigate the possibility of multiple HAP coverage of a common cell area. In particular we study the uplink system performance since it is considered as a worst case scenario. In order to obtain further enhancement (interference mitigation) we also apply space-time diversity techniques, such as Single-Input Multiple-Output (SIMO) receive diversity or Multiple-Input Multiple-Output (MIMO) diversity, to improve the spectrum reuse in the multiple HAP scenario. We will show the level of improvement using SIMO and MIMO algorithms, the practical limits on the number of HAPs and SIMO/MIMO system dimension in response to traffic demands and the type of service used.

[1]  Goran M. Djuknic,et al.  Establishing wireless communications services via high-altitude aeronautical platforms: a concept whose time has come? , 1997, IEEE Commun. Mag..

[2]  Barry G. Evans,et al.  Results of multiband (L, S, Ku band) propagation measurements and model for high elevation angle land mobile satellite channel , 1993 .

[3]  David Grace,et al.  Channel assignment strategies for a high altitude platform spot-beam architecture , 2002, The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

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

[5]  Constantine A. Balanis,et al.  Antenna Theory: Analysis and Design , 1982 .

[6]  Yiming Liu,et al.  Effective system spectral efficiency applied to a multiple high-altitude platform system , 2005 .

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

[8]  David Grace,et al.  Performance of Multiple High Altitude Platforms using Directive HAP and User Antennas , 2005, Wirel. Pers. Commun..

[9]  Xiaodong Wang,et al.  Performance Comparisons of MIMO Techniques with Application to WCDMA Systems , 2004, EURASIP J. Adv. Signal Process..

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

[11]  W. Vogel,et al.  Propagation effects for land mobile satellite systems: Overview of experimental and modeling results , 1992 .

[12]  Alister G. Burr,et al.  Providing multimedia communications services from high altitude platforms , 2001, Int. J. Satell. Commun. Netw..