Coexistence and Performance Limits for the Cognitive Broadband Satellite System and mmWave Cellular Network

Qianfeng Zhang,Tao Liang,Kang An,Xiaojuan Yan

doi:10.1109/access.2020.2980580

Abstract

The application of millimeter wave (mmWave) spectrum for the next generation broadband communications has received significant attention recently. In this work, we investigate the performance limits for the coexistence of the geo-stationary orbit (GEO) broadband satellite networks and terrestrial mmWave cellular networks. Based on the assumption that the statistical channel state information (SCSI) is available at the terrestrial base station (BS), we propose a virtual uplink based transmit beamforming (BF) algorithm to maximize the ergodic capacity of the terrestrial user while satisfying the interference probability constraint of the satellite users. Furthermore, we derive the closed-form expressions for the outage probability (OP) and ergodic capacity (EC) of the terrestrial user. Besides, the asymptotic OP expression at high signal-to-noise ratio (SNR) is also developed in terms of diversity order and array gain of the terrestrial user. Finally, numerical results are given to confirm the validity of the proposed BF scheme and theoretical derivations, and reveal the impact of key parameters on the performance of the terrestrial user coexisting with the multiple satellite users.

Highlights

Satellite communication (SATCOM) has been widely applied in many fields, such as navigation, broadcasting, rescue, and disaster relief, since it can overcome long distances and inhospitable terrains, as well as provide wide coverage and high data rate for worldwide users [1], [2]
NUMERICAL RESULTS we provide numerical simulations to confirm the validity of the proposed BF scheme and theoretical derivations, and demonstrate the impact of various parameters on the performance of terrestrial user
Since that the minimum elevation angle for the geo-stationary orbit (GEO) receivers is commonly adopted around αmin ≈ 10◦ to tackle the geographical terrain effect [43]

Summary

Introduction

Satellite communication (SATCOM) has been widely applied in many fields, such as navigation, broadcasting, rescue, and disaster relief, since it can overcome long distances and inhospitable terrains, as well as provide wide coverage and high data rate for worldwide users [1], [2]. For current satellite communication systems, such as Inmarsat, Globalstar and Iridium, mobile satellite service (MSS) are often achieved in the low frequency bands below 10 GHz. To accommodate the increasing traffic demands in the future, the research on higher frequency band, such as millimeter wave (mmWave) satellite communications have been accelerated in both of the academic and industry communities. Regulations, the mmWave will be the main spectral band in future satellite networks to achieve the seamless broad band access wherever the terrestrial deployment cannot be provided or cost unfavorable [3]. The framework of hybrid satellite terrestrial networks, which jointly exploit advantages of both systems [6]–[8], has been viewed as a promising candidate for the future 5G infrastructures [9], [10].

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