Abstract
In this thesis, we propose a single relay selection scheme based on symbol-error-rate (SER) performance analysis for two-way decode-and-forward (DF) relay networks. The proposed scheme aims at selecting the best relay that minimizes the overall average end-to-end SER of the system, where the multiple-access phase, along with the broadcasting phase, is considered. By contrast, the previous works only took the broadcasting phase to form their selection criteria. We first derive a closed-form average end-to-end SER of the system. Then the SER expression is further approximated in the high SNR regime to form a computation-affordable relay selection criterion. The theoretical result of our SER analysis is verified by Monte-Carlo simulations. Moreover, simulation results show that the proposed relay selection scheme achieves significant performance improvement over the random selection scheme and performs very close to the optimal selection scheme in the sense of minimum SER.