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A New Look at Dual-Hop Relaying: Performance Limits with Hardware Impairments
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
2013 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 61, no 11, 4512-4525 p.Article in journal (Refereed) Published
Abstract [en]

Physical transceivers have hardware impairments that create distortions which degrade the performance of communication systems. The vast majority of technical contributions in the area of relaying neglect hardware impairments and, thus, assume ideal hardware. Such approximations make sense in low-rate systems, but can lead to very misleading results when analyzing future high-rate systems. This paper quantifies the impact of hardware impairments on dual-hop relaying, for both amplify-and-forward and decode-and-forward protocols. The outage probability (OP) in these practical scenarios is a function of the effective end-to-end signal-to-noise-and-distortion ratio (SNDR). This paper derives new closed-form expressions for the exact and asymptotic OPs, accounting for hardware impairments at the source, relay, and destination. A similar analysis for the ergodic capacity is also pursued, resulting in new upper bounds. We assume that both hops are subject to independent but non-identically distributed Nakagami-m fading. This paper validates that the performance loss is small at low rates, but otherwise can be very substantial. In particular, it is proved that for high signal-to-noise ratio (SNR), the end-to-end SNDR converges to a deterministic constant, coined the SNDR ceiling, which is inversely proportional to the level of impairments. This stands in contrast to the ideal hardware case in which the end-to-end SNDR grows without bound in the high-SNR regime. Finally, we provide fundamental design guidelines for selecting hardware that satisfies the requirements of a practical relaying system.

Place, publisher, year, edition, pages
IEEE Press, 2013. Vol. 61, no 11, 4512-4525 p.
Keyword [en]
Amplify-and-forward, Decode-and-forward, Dual-hop relaying, Ergodic capacity, Nakagami-m fading, Outage probability, Transceiver hardware impairments
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-139985DOI: 10.1109/TCOMM.2013.100913.130282ISI: 000330223000009ScopusID: 2-s2.0-84890440160OAI: diva2:689160
Swedish Research Council, 2012-228EU, European Research Council, 305123 MOREVinnova

QC 20140120

Available from: 2014-01-20 Created: 2014-01-16 Last updated: 2014-02-27Bibliographically approved

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