In‐line interference mitigation techniques for spectral coexistence of GEO and NGEO satellites

Abstract

Summary The interest towards the deployment of Low Earth Orbit (LEO)/Medium Earth Orbit (MEO) satellite systems in several frequency bands is increasing due to the requirement of low latency for real‐time systems and high demand of broadband data. When the number of usable Non‐Geostationary (NGEO) satellites, that is, LEO/MEO in space, increases, the frequency coexistence between the NGEO satellite systems with the already existing geostationary (GEO) satellite networks becomes a requisite. In this context, it is crucial to explore interference mitigation techniques between GEO and NGEO systems in order to allow their spectral coexistence. More specifically, in the coexistence scenario of GEO and NGEO satellite networks, in‐line interference may be a serious problem, especially in the equatorial region. In this paper, we provide several frequency sharing studies in the context of the coexistence of an NGEO satellite link with another NGEO/GEO satellite link. Furthermore, we carry out interference analysis between GEO and MEO satellite systems considering the case of the O3b satellite system and propose an adaptive power control technique for both the uplink and downlink scenarios in order to mitigate the in‐line interference. Moreover, we suggest several cognitive solutions for mitigating the in‐line interference and provide future research issues. Copyright © 2014 John Wiley & Sons, Ltd.

3D Beamforming for Spectral Coexistence of Satellite and Terrestrial Networks

“…The existing literature can be broadly categorized into [4]: (i) hybrid satellite-terrestrial coexistence, and (ii) dual satellite coexistence [5]. The first category deals with the spectral coexistence of satellite and terrestrial networks over the same spectrum whereas the latter deals with the spectral coexistence of two satellite networks.…”

Cognitive Interference Management Techniques for the Spectral Co-existence of GSO and NGSO Satellites

“…Wherein, the integration between different satellite constellations plays a key role in moving towards the next generation of the satellite networks. A more related work to the objective of current paper can be found in [19], [10]. Authors in [19] find the minimum separation distance between terrestrial base station (BS) and FSS earth station by considering the interference caused from terrestrial BS to the FSS earth station.…”

“…Various studies have been conducted to address challenges in interference mitigation in the literature and ITU-R reports [5]- [10]. Concerning the uncoordinated (cognitive) techniques some of these approaches are: satellite selection strategies with the largest angular discrimination [11]; spot turnoff method [12]- [13]; and power control technique [10].…”

“…Concerning the uncoordinated (cognitive) techniques some of these approaches are: satellite selection strategies with the largest angular discrimination [11]; spot turnoff method [12]- [13]; and power control technique [10]. In the last technique, a cognitive transmission power algorithm is used to provide the required signal to noise ratio (SNR) at the receiver and maintain the interference level at the victim receiver.…”

“…In particular, the interference mitigation is more complicated considering a practical dual satellite system (DSS) scenario, in which two satellites (e.g., GSO-NGSO satellites) operate over the same coverage area while sharing the spectrum bands [9]. In the co-existence scenarios of GSO-NGSO networks, in-line interference arises whenever an NGSO satellite passes through a line of sight path between an earth station and a GSO satellite [10]. It occurs due to the fact that an NGSO satellite may create/receive interference through its sidelobe or mainlobe to the GSO system (please see Fig.…”