187 research outputs found
Frame Based Precoding in Satellite Communications: A Multicast Approach
In the present work, a multibeam satellite that employs aggressive frequency
reuse towards increasing the offered throughput is considered. Focusing on the
forward link, the goal is to employ multi-antenna signal processing techniques,
namely linear precoding, to manage the inter-beam interferences. In this
context, fundamental practical limitations, namely the rigid framing structure
of satellite communication standards and the on-board per-antenna power
constraints, are herein considered. Therefore, the concept of optimal frame
based precoding under per-antenna constraints, is discussed. This consists in
precoding the transmit signals without changing the underlying framing
structure of the communication standard. In the present work, the connection of
the frame based precoding problem with the generic signal processing problem of
conveying independent sets of common data to distinct groups of users is
established. This model is known as physical layer multicasting to multiple
co-channel groups. Building on recent results, the weighted fair per-antenna
power constrained multigroup multicast precoders are employed for frame based
precoding. The throughput performance of these solutions is compared to
multicast aware heuristic precoding methods over a realistic multibeam
satellite scenario. Consequently, the gains of the proposed approach are
quantified via extensive numerical results.Comment: Accepted for presentation at the IEEE ASMS 201
Linear Precoding performance analysis in a Broadband satellite system with a 2-color dual-polarization reuse scheme
The potential of Joint Multiuser Processing in multi-beam satellite systems is assessed in this paper and proved to be a potential attractive alternative to current systems. The present contribution aims at investigating linear precoding techniques over an accurate multi-beam architecture modeling and system characterization. Power and precoder design problems are approached through well-known linear precoding techniques such as Zero Forcing (ZF) and Regularized-ZF. A dual-polarization 2-color reutilization scheme is considered in combination with precoding techniques. Results show a total throughput improvement of +22% achieved by ZF and +38% considering R-ZF, with respect to a conventional 4-color reuse scheme scenario
Next Generation High Throughput Satellite System
This paper aims at presenting an overview of the state-of-the-art in High Throughput Satellite (HTS) systems for Fixed Satellite Services (FSS) and High Density-FSS. Promising techniques and innovative strategies that can enhance system performance are reviewed and analyzed aiming to show what to expect for next generation ultra-high capacity satellite systems. Potential air interface evolutions, efficient frequency plans,feeder link dimensioning strategies and interference cancellation techniques are presented to show how Terabit/s satellite myth may turn into reality real soon
Precoded Cluster Hopping in Multi-Beam High Throughput Satellite Systems
Beam-Hopping (BH) and precoding are two trending technologies for the
satellite community. While BH enables flexibility to adapt the offered capacity
to the heterogeneous demand, precoding aims at boosting the spectral
efficiency. In this paper, we consider a high throughput satellite (HTS) system
that employs BH in conjunction with precoding. In particular, we propose the
concept of Cluster-Hopping (CH) that seamlessly combines the BH and precoding
paradigms and utilize their individual competencies. The cluster is defined as
a set of adjacent beams that are simultaneously illuminated. In addition, we
propose an efficient time-space illumination pattern design, where we determine
the set of clusters that can be illuminated simultaneously at each hopping
event along with the illumination duration. We model the CH time-space
illumination pattern design as an integer programming problem which can be
efficiently solved. Supporting results based on numerical simulations are
provided which validate the effectiveness of the proposed CH concept and
time-space illumination pattern design
System Modelling and Design Aspects of Next Generation High Throughput Satellites
Future generation wireless networks are targeting the convergence of fixed,
mobile and broadcasting systems with the integration of satellite and
terrestrial systems towards utilizing their mutual benefits. Satellite
Communications (Sat- Com) is envisioned to play a vital role to provide
integrated services seamlessly over heterogeneous networks. As compared to
terrestrial systems, the design of SatCom systems require a different approach
due to differences in terms of wave propagation, operating frequency, antenna
structures, interfering sources, limitations of onboard processing, power
limitations and transceiver impairments. In this regard, this letter aims to
identify and discuss important modeling and design aspects of the next
generation High Throughput Satellite (HTS) systems. First, communication models
of HTSs including the ones for multibeam and multicarrier satellites, multiple
antenna techniques, and for SatCom payloads and antennas are highlighted and
discussed. Subsequently, various design aspects of SatCom transceivers
including impairments related to the transceiver, payload and channel, and
traffic-based coverage adaptation are presented. Finally, some open topics for
the design of next generation HTSs are identified and discussed.Comment: submitted to IEEE Journa
- …