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Relay Selection and Power Allocation for Full-Duplex Decode-and-Forward Relay Cooperative Networks

In this paper, outage probability is investigated for full-duplex (FD) multi-relay networks with decode-and-forward (DF) protocol. Since FD operation allows node to transmit and receive signals on the same frequency band simultaneously, loop interference (LI) caused by power leakage between transmit and receive antennas is inevitable and deteriorates system performance. We propose five relay selection strategies based on different channel situation information (CSI) and obtain closed-form expressions of outage probability for them. Furthermore, two power allocation algorithms are proposed to optimize outage performance and their closed-form optimal allocation solutions are derived. Numerical simulation is made to facilitate comparison and verify our analysis. By observing simulations, we find that outage performance can be significantly enhanced by power allocation and both proposed allocation algorithms have their pros and cons.