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I/Q Imbalance in Two-Way AF Relaying: Performance Analysis and Detection Mode Switch

Jingya Li (Institutionen för signaler och system, Kommunikationssystem) ; Michail Matthaiou (Institutionen för signaler och system, Signalbehandling) ; Tommy Svensson (Institutionen för signaler och system, Kommunikationssystem)
IEEE Global Communications Conference (GLOBECOM), Austin, TX, December 2014 p. 4001-4007. (2014)
[Konferensbidrag, refereegranskat]

This paper studies the impact of in-phase and quadrature-phase imbalance (IQI) in two-way amplify-and-forward (AF) relaying systems. In particular, the effective signal-to-interference-plus-noise ratio (SINR) is derived for each source node, considering four different linear detection schemes, namely, uncompensated (Uncomp) scheme, maximal-ratio-combining (MRC), zero-forcing (ZF) and minimum mean-square error (MMSE) based schemes. For each proposed scheme, the outage probability (OP) is investigated over independent, non-identically distributed Nakagami-m fading channels, and exact closed-form expressions are derived for the first three schemes. Based on the closed-form OP expressions, an adaptive detection mode switching scheme is designed for minimizing the OP of both sources. An important observation is that, regardless of the channel conditions and transmit powers, the ZF-based scheme should always be selected if the target SINR is larger than 3 (4.77 dB), while the MRC-based scheme should be avoided if the target SINR is larger than 0.38 (-4.20 dB).


Article number 7037433



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Denna post skapades 2014-07-24. Senast ändrad 2016-01-05.
CPL Pubid: 200717

 

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