Skip to content


  • Research Article
  • Open Access

An Evaluation of Interference Mitigation Schemes for HAPS Systems

EURASIP Journal on Wireless Communications and Networking20082008:865393

  • Received: 28 September 2007
  • Accepted: 23 May 2008
  • Published:


The International Telecommunication Union-Radiocommunication sector (ITU-R) has conducted frequency sharing studies between fixed services (FSs) using a high altitude platform station (HAPS) and fixed-satellite services (FSSs). In particular, ITU-R has investigated the power limitations related to HAPS user terminals (HUTs) to facilitate frequency sharing with space station receivers. To reduce the level of interference from the HUTs that can harm a geostationary earth orbit (GEO) satellite receiver in a space station, previous studies have taken two approaches: frequency sharing using a separated distance (FSSD) and frequency sharing using power control (FSPC). In this paper, various performance evaluation results of interference mitigation schemes are presented. The results include performance evaluations using a new interference mitigation approach as well as conventional approaches. An adaptive beamforming scheme (ABS) is introduced as a new scheme for efficient frequency sharing, and the interference mitigation effect on the ABS is examined considering pointing mismatch errors. The results confirm that the application of ABS enables frequency sharing between two systems with a smaller power reduction of HUTs in a cocoverage area compared to this reduction when conventional schemes are utilized. In addition, the analysis results provide the proper amount of modification at the transmitting power level of the HUT required for the suitable frequency sharing.


  • Power Reduction
  • Conventional Scheme
  • Mitigation Effect
  • International Telecommunication
  • User Terminal

Publisher note

To access the full article, please see PDF

Authors’ Affiliations

Department of Global Area Wireless Technology Research, Electronics and Telecommunications Research Institute, Daejeon, 305-350, South Korea
Information and Communication Engineering Division, Chungbuk National University, Cheongju, 360-763, South Korea


© Bon-Jun Ku et al. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.