Frequency Packing and Multiuser Detection for CPMs: How to Improve the Spectral Efficiency of DVB-RCS2 Systems
TLDR
This work describes a framework for computing the information rate (IR) and the SE of such systems, and uses it for optimizing the channel spacing between adjacent users and the CPM phase response, and considers practical schemes, where CPMs are serially concatenated with an outer code.Abstract:
We consider a frequency division multiplexed system where each user adopts a continuous phase modulation (CPM) and multiuser detection is employed at the receiver side. The spectral efficiency (SE) is used as a performance measure to compare, from an information-theoretic point of view, different modulation formats. More precisely, we consider the new CPM formats recently included in the DVB-RCS2 standard. We describe a framework for computing the information rate (IR) and the SE of such systems, and use it for optimizing the channel spacing between adjacent users and the CPM phase response. Our analysis reveals that modulation formats adopted in the DVB-RCS2 standard are suboptimal in terms of SE, while if we allow multiuser detection excellent performance can be achieved by using simple binary formats and highly frequency packed signals. Furthermore, we consider practical schemes, where CPMs are serially concatenated with an outer code, and a low-complexity multiuser receiver is employed, showing that the theoretical limits predicted by the IR analysis can be approached.read more
Citations
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Journal ArticleDOI
Multiuser Detection in Multibeam Satellite Systems: Theoretical Analysis and Practical Schemes
TL;DR: It is shown that classical codes from the DVB-S2(X) standard are not suitable when multiuser detection is adopted and two ways to improve the performance are proposed based on the redesign of the code and of the bit mapping.
Proceedings ArticleDOI
Multiuser detection in multibeam satellite systems: Theoretical analysis and practical schemes
TL;DR: It is shown that classical codes from the DVB-S2(X) standard are not suitable when multiuser detection is adopted and two ways to improve the performance are proposed based on the redesign of the code and of the bit mapping.
Proceedings ArticleDOI
On the application of multiuser detection in multibeam satellite systems
TL;DR: In this paper, the achievable rate of a single user in multibeam satellite scenarios was studied. But the achievable rates were not analyzed for single user detection when the terminal is located near the edge of the coverage area, and when aggressive frequency reuse is adopted.
Journal ArticleDOI
Capacity of Interference Exploitation Schemes in Multibeam Satellite Systems
Alessandro Ugolini,Giulio Colavolpe,Martina Angelone,Alessandro Vanelli-Coralli,Alberto Ginesi +4 more
TL;DR: This paper proposes a framework to jointly optimize the achievable rates of two signals sharing the same frequency in the forward link of a multibeam satellite system and demonstrates that the use of multiuser detection can achieve significant gains over a reference strategy based on single-user detection.
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Pär Moqvist,Tor Aulin +1 more
TL;DR: An a posteriori probability (APP) algorithm for CPM is developed based on the classic APP algorithm for channel codes, showing that remarkably good performance can be obtained for some simple systems.
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Time-frequency packing for linear modulations: spectral efficiency and practical detection schemes
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