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Wireless Networks
Erschienen in: Wireless Networks 8/2012

01.11.2012

Throughput performance of parallel and repetition coding in incremental decode-and-forward relaying

verfasst von: Hirley Alves, Richard Demo Souza, Gustavo Fraidenraich, Marcelo Eduardo Pellenz

Erschienen in: Wireless Networks | Ausgabe 8/2012

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Abstract

The throughput performance of cooperative repetition and parallel coding in incremental decode-and-forward is investigated. Four transmission methods are considered: parallel coding with and without distributed space-time coding (PC-ST and PC, respectively); and repetition coding with and without Chase combining at the destination (RC and SC, respectively). The analysis is based on the mutual information seen at the receiver for each scheme. Exact expressions for the outage probability and throughput for all methods are derived. Both ad-hoc and infra-structured relaying scenarios are investigated. Results show that SC can perform very close to RC, PC and PC-ST in terms of throughput, specially in the case of infra-structured relaying or adequate power and rate allocation. The conclusion is that SC would be a better option in practice, since it requires a simpler receiver than PC-ST, PC, and RC.
Nächster Artikel Enhancing the performance of TCP over Wi-Fi power saving mechanisms

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Fußnoten
1
In SC, as the receiver does not combine the original and the retransmitted messages, the outage is determined by the link with the best SNR between the source to destination and the relay to destination links. Thus, we can say that the receiver applies “selection combining” between the signals received from the source and from the relay.
 
2
In this paper all channels are modeled as a random variable from a complex Gaussian distribution with zero mean and unity variance, so that the channel envelope is Rayleigh distributed with unity energy.
 
3
The source and the relay retransmit in perfect synchronism only if the relay was able to decode the original source transmission. Otherwise, the retransmission comes from the source alone.
 
4
The Matlab function fmincon was used to numerically solve the optimization problem.
 
5
One might argue that power allocation between source and relay should not be considered for the infra-structured scenario, since the relay is deployed by the service provider. However, we consider the power allocation between source and relay because in an energy efficiency sense it is interesting to see how well the methods can perform under a limited amount of resources (one could compare the efficiency of ad-hoc relaying to that of infra-structured relaying). Moreover, the general conclusion—that the schemes perform basically the same—simply does not change if one considers only rate allocation in the infra-structured scenario.
 
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Metadaten
Titel
Throughput performance of parallel and repetition coding in incremental decode-and-forward relaying
verfasst von
Hirley Alves
Richard Demo Souza
Gustavo Fraidenraich
Marcelo Eduardo Pellenz
Publikationsdatum
01.11.2012
Verlag
Springer US
Erschienen in
Wireless Networks / Ausgabe 8/2012
Print ISSN: 1022-0038
Elektronische ISSN: 1572-8196
DOI
https://doi.org/10.1007/s11276-012-0440-5

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