Gateway Switching in Q/V Band Satellite Feeder Links

2018 IEEE Wireless Communications and Networking Conference (WCNC)

Maleki

et al. 2018

Abstract-This paper aims to design joint on-ground precoding and on-board beamforming of a multiple gateway multibeam satellite system in a hybrid space-ground mode where full frequency reuse pattern is considered among the beams. In such an architecture, each gateway serves a cluster of adjacent beams such that the adjacent clusters are served through a set of gateways that are located at different geographical areas. However, such a system brings in two challenges to overcome. First, the inter-beam interference is the bottleneck of the whole system and applying interference mitigation techniques becomes necessary. Second, as the data demand increases, the ground and space segments should employ extensive bandwidth resources in the feeder link accordingly. This entails embedding an extra number of gateways aiming to support a fair balance between the increasing demand and the corresponding required feeder link resources. To solve these problems, this study investigates the impact of employing a joint multiple gateway architecture and onboard beamforming scheme. It is shown that by properly designing the on-board beamforming scheme, the number of gateways can be kept affordable even if the data demand increases. Moreover, Zero Forcing (ZF) precoding technique is considered to cope with the inter-beam interference where each gateway constructs a part of block ZF precoding matrix. The conceived designs are evaluated with a close-to-real beam pattern and the latest broadband communication standard for satellite communications.

Section: B Contributionsmentioning

confidence: 99%

Section: Introduction a Motivationmentioning

confidence: 99%

Designing joint precoding and beamforming in a multiple gateway multibeam satellite system

Joroughi

2018 IEEE Wireless Communications and Networking Conference (WCNC)

Maleki

et al. 2018

“…The amplitude of the user downlink channel is dominated by the rain attenuation and is modelled using the log normal distribution [6]. Further, the temporal variations of the amplitude are considered to be negligible over the intervals of interest and hence time dependence is omitted from |hi,j|.…”

Section: Multibeam Satellites : System Model and Channel Phase Uncertmentioning

confidence: 99%

“…Towards incorporating the use of precoding in next generation satellite systems, it becomes essential to investigate the effect of artifacts, if any, induced by RTD. Pursuing this activity, we recognize that the main component affecting the channel amplitude is the rain attenuation whose variations are slow [6]. Hence, we can assume that the amplitude of the channel is fixed during the feedback interval.…”

Section: Introductionmentioning

confidence: 99%

Robust precoding design for multibeam downlink satellite channel with phase uncertainty

Gharanjik

2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

Arapoglou³

et al. 2015

In this work, we study the design of a precoder on the user downlink of a multibeam satellite channel. The variations in channel due to phase noise introduced by on-board oscillators and the long round trip delay result in outdated channel information at the transmitter. The phase uncertainty is modelled and a robust design framework is formulated based on availability and power constraints. The optimization problem is cast into the convex paradigm after approximations and the benefits of the resulting precoder are highlighted.

“…A potential solution for resolving the issue could be moving the feeder link from the Ka-band to the Q/V-band (40/50 GHz) and W-band (70/80 GHz) where larger bandwidth, up to 5 GHz, is available [1]- [4]. Another revolutionary solution could be to move the feeder link from RF to optical frequencies.…”

Section: Introductionmentioning

confidence: 99%

Spatial multiplexing in optical feeder links for high throughput satellites

Gharanjik

Liolis

2014 IEEE Global Conference on Signal and Information Processing (GlobalSIP)

et al. 2014

Abstract-Optical feeder links are an attractive alternative to the RF feeder links in satellite communications (SatCom). In this paper, we present initial results from an optical feeder link study. We discuss the architecture of a geostationary earth orbit (GEO) satellite system based on optical feeder links. To mitigate the effects of cloud coverage, which is the main availability-limiting factor, Optical Ground Station (OGS) diversity is employed. Moreover, a spatial multiplexing scheme is considered. Assuming an ON-OFF channel model, the number of required OGSs to ensure availability and throughput requirements is analyzed.