I/Q Imbalance in Two-Way AF Relaying
Journal article, 2014

We analyze the performance of dual-hop, two-way amplify-and-forward relaying in the presence of in-phase and quadrature-phase imbalance (IQI) at the relay node. In particular, two power allocation schemes, namely, fixed power allocation and instantaneous power allocation, are proposed to improve the system reliability and robustness against IQI under a total transmit power constraint. For each proposed scheme, the outage probability is investigated over independent, non-identically distributed Nakagami-m fading channels, and exact closed-form expressions and bounds are derived. Our theoretical analysis indicates that without IQI compensation, IQI can create fundamental performance limits on two-way relaying. However, these limits can be avoided by performing IQI compensation at source nodes. Compared to the equal power allocation scheme, our numerical results show that the two proposed power allocation schemes can significantly improve the outage performance, thus reducing the IQI effects, especially when the total power budget is large.

power allocation

outage probability

two-way relaying

Nakagami-m fading

I/Q imbalance

Author

Jingya Li

Chalmers, Signals and Systems, Kommunikationssystem, informationsteori och antenner, Communication Systems

Michail Matthaiou

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Tommy Svensson

Chalmers, Signals and Systems, Kommunikationssystem, informationsteori och antenner, Communication Systems

IEEE Transactions on Communications

0090-6778 (ISSN)

Vol. 62 7 2271-2285

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

Communication Systems

Signal Processing

DOI

10.1109/TCOMM.2014.2325036

More information

Created

10/7/2017