Journal ArticleDOI
Contention Resolution Diversity Slotted ALOHA (CRDSA): An Enhanced Random Access Schemefor Satellite Access Packet Networks
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TLDR
It is shown that CRDSA largely outperforms the classical lotted ALOHA (SA) technique in terms of throughput under equal packet loss ratio conditions, and can be easily integrated in systems equipped with digital burst demodulators.Abstract:
In this paper a new multiple access scheme dubbed contention resolution diversity slotted ALOHA (CRDSA) is introduced and its performance and implementation are thoroughly analyzed. The scheme combines diversity transmission of data bursts with efficient interference cancellation techniques. It is shown that CRDSA largely outperforms the classical lotted ALOHA (SA) technique in terms of throughput under equal packet loss ratio conditions (e.g. 17-fold improvement at packet loss ratio = 2 middot 10-2). CRDSA allows to boost the performance of random access (RA) channels in the return link of interactive satellite networks, making RA very efficient and providing low latency for the transmission of small size sparse packets. Implementation-wise it is shown that the CRDSA technique can be easily integrated in systems equipped with digital burst demodulators.read more
Citations
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Journal ArticleDOI
Graph-Based Analysis and Optimization of Contention Resolution Diversity Slotted ALOHA
TL;DR: The IC process of CRDSA can be conveniently described by a bipartite graph, establishing a bridge between the IC process and the iterative erasure decoding of graph-based codes and proposing a novel scheme, named irregular repetition slotted ALOHA, that can achieve a throughput of 0.97 for large frames and near to T ≅ 0.8 in practical implementations.
Journal ArticleDOI
Satellite Communications in the New Space Era: A Survey and Future Challenges
Oltjon Kodheli,Eva Lagunas,Nicola Maturo,Shree Krishna Sharma,Bhavani Shankar,Jesus Fabian Mendoza Montoya,Juan Carlos Merlano Duncan,Danilo Spano,Symeon Chatzinotas,Steven Kisseleff,Jorge Querol,Lei Lei,Thang X. Vu,George Goussetis +13 more
TL;DR: In this article, the authors present a survey of the state of the art in satellite communications, while highlighting the most promising open research topics, such as new constellation types, on-board processing capabilities, non-terrestrial networks and space-based data collection/processing.
Journal ArticleDOI
Satellite Communications Supporting Internet of Remote Things
TL;DR: This work provides an integrated view of satellite-based IoT, handling this topic as a jigsaw puzzle where the pieces to be assembled are represented by the following topics: MAC protocols for satellite routed sensor networks, efficient IPv6 support, heterogeneous networks interoperability, quality of service (QoS) management, and group-based communications.
Proceedings ArticleDOI
A perspective on massive random-access
TL;DR: This paper discusses the contemporary problem of providing multiple-access (MAC) to a massive number of uncoordinated users and defines a random-access code for Ka-user Gaussian MAC to be a collection of norm-constrained vectors such that the noisy sum of any Ka of them can be decoded with a given probability of error.
Journal ArticleDOI
LEO Satellite Constellation for Internet of Things
TL;DR: An overview of the architecture of the LEO satellite constellation-based IoT including the following topics: LEOatellite constellation structure, efficient spectrum allocation, heterogeneous networks compatibility, and access and routing protocols is provided.
References
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Proceedings ArticleDOI
THE ALOHA SYSTEM: another alternative for computer communications
TL;DR: A remote-access computer system under development as part of a research program to investigate the use of radio communications for computer-computer and console-computer links and a novel form of random-access radio communications developed for use within THE ALOHA SYSTEM is described.
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ALOHA packet system with and without slots and capture
TL;DR: Roberts investigates methods of increasing the effective channel capacity of such a channel and proposes to consider the channel to be slotted into segments of time whose duration is equal to the packet transmission time, and to require the devices to begin a packet transmission at the beginning of a time slot.
Journal ArticleDOI
Analysis of a simple successive interference cancellation scheme in a DS/CDMA system
P. Patel,J.M. Holtzman +1 more
TL;DR: This work analyzes a simple successive interference cancellation scheme for coherent BPSK modulation and extends the analysis for a noncoherent modulation scheme, namely M-ary orthogonal modulation.
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The Throughput of Packet Broadcasting Channels
TL;DR: This paper provides a unified presentation of packet broadcasting theory, derived some properties of power-limited packet broadcasting channels, showing that the throughput of such channels can approach that of equivalent point-to-point channels.
Journal ArticleDOI
Diversity ALOHA--A Random Access Scheme for Satellite Communications
G. Choudhury,S. Rappaport +1 more
TL;DR: A generalization of the slotted ALOHA random access scheme is considered in which a user transmits multiple copies of the same packet and it is found that under light traffic, multiple transmission gives better delay performance.