We investigate the performance of dual-hop two-way amplify-and-forward (AF) relaying in the presence of inphase and quadrature-phase imbalance (IQI) at the relay node. In particular, the effective signal-to-interference-plus-noise ratio (SINR) at both sources is derived. These SINRs are used to design an instantaneous power allocation scheme, which maximizes the minimum SINR of the two sources under a total transmit power constraint. The solution to this optimization problem is analytically determined and used to evaluate the outage probability (OP) of the considered two-way AF relaying system. Both analytical and numerical results show that IQI can create fundamental performance limits on two-way relaying, which cannot be avoided by simply improving the channel conditions.
|Title of host publication||2014 IEEE International Conference on Communications (ICC)|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Publication status||Published - Aug 2014|
Li, J., Matthaiou, M., & Svensson, T. (2014). I/Q imbalance in two-way AF relaying: Power allocation and performance analysis. In 2014 IEEE International Conference on Communications (ICC) Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/ICC.2014.6884120