PAPR of Variable-Gain and Fixed-Gain Amplify and Forward Relaying

Michalopoulos D, Hadzi-Velkov Z, Karagiannidis GK, Schober R (2013)

Publication Language: English

Publication Type: Conference contribution

Publication year: 2013

Publisher: VDE

Event location: München DE

ISBN: 978-3-8007-3482-5

Abstract

Most works on amplify and forward (AF) relaying assume that the relay obtains perfect channel state information (CSI) of the source-relay channel. This renders variable-gain relaying (VGR) an attractive technique, as the relay can ideally invert the channel at its input and thus ensure constant output power. What happens to the output power, however, if the CSI at the input is outdated? As an attempt to answer this question, we introduce a study of AF relaying under a novel perspective. This involves the use of the well-known peak-to-average-powerratio (PAPR) for capturing the negative effects of imperfect channel inversion at the relay. The imperfect channel inversion, caused by imperfect CSI at the relay, results in using the power amplifier in its non-linear region, which induces signal distortion. In this regard, expressions for the complementary cumulative distribution function (CCDF) of the PAPR at the relay's output are derived. The analysis involves VGR with outdated CSI at its input, as well as its simpler counterpart which uses only statistical CSI, namely fixed-gain relaying (FGR). Our results manifest that there exists a threshold on the reliability of the CSI at the relay, below which VGR looses its advantage over FGR in being more efficient in terms of the potential signal distortion at the relay, caused by amplification in the non-linear region.

Authors with CRIS profile

Diomidis Michalopoulos Lehrstuhl für Digitale Übertragung Robert Schober Lehrstuhl für Digitale Übertragung

Involved external institutions

Aristotle University of Thessaloniki GR Greece (GR) Saints Cyril and Methodius University of Skopje / Универзитет „Св. Кирил и Методиј“ во Скопје MK Republic of North Macedonia (MK)

How to cite

APA:

Michalopoulos, D., Hadzi-Velkov, Z., Karagiannidis, G.K., & Schober, R. (2013). PAPR of Variable-Gain and Fixed-Gain Amplify and Forward Relaying. In VDE (Eds.), Proceedings of the SCC 2013; 9th International ITG Conference on Systems, Communication and Coding. München, DE: VDE.

MLA:

Michalopoulos, Diomidis, et al. "PAPR of Variable-Gain and Fixed-Gain Amplify and Forward Relaying." Proceedings of the SCC 2013; 9th International ITG Conference on Systems, Communication and Coding, München Ed. VDE, VDE, 2013.

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