Spectrum sharing with terrestrial networks (TNs) is a challenging task in wireless communications using high-altitude platform stations (HAPSs). Various methods for HAPS-terrestrial spectrum sharing have been proposed. However, few studies have verified their effectiveness using a real payload system for HAPSs. This study proposes a novel interference reduction scheme based on nullforming techniques for a cylindrical array antenna, which uses angular information of HAPS users instead of their channel state information. In addition, a 5G-based service link evaluation system, which includes a 36-element cylindrical array antenna and the proposed precoder, has been implemented, and a field trial using this system was conducted to evaluate the interference reduction performance of the proposed scheme in a real rural environment. The experimental results show that the proposed scheme can mitigate the interference with TNs by approximately 20 dB relative to the main lobe level of user-specific beams in a rural scenario.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Implementation and Experimental Evaluation of Nullforming-Based Interference Reduction Scheme for HAPS-Terrestrial Spectrum Sharing


    Contributors:


    Publication date :

    2024-10-07


    Size :

    1590456 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




    Interference Coordination Method for Integrated HAPS-Terrestrial Networks

    Liu, Wenjia / Hou, Xiaolin / Chen, Lan et al. | IEEE | 2022



    A Study of Co-Channel Spectrum-Sharing System between HAPS and Terrestrial Mobile Communication Networks

    Konishi, Mitsukuni / Nishimaki, Takuya / Shibata, Yohei et al. | IEEE | 2020


    Co-channel Interference for Terrestrial and HAPS Systems in a Cellular Structure

    Cuevas-Ruiz, José Luis / Aragon-Zavala, Alejandro / Bautista-Leon, Beatriz | IEEE | 2009