Optimization For Energy-Efficient OFDM Amplify and Forward Non-Concurrent Two-Way Relaying

We consider an orthogonal frequency division multiplexing based non-concurrent two-way relaying (ncTWR), where the base station (BS) serves a transmit user (TU) and a receive user (RU), whose receive signal is interfered by the TU transmit signal. The RU uses noisy side-information gathered by overhearing the TU transmit signal to neutralize the interference. We optimize the global energy efficiency (GEE) metric, which is a fractional function of the network sum-rate and its total energy consumption, by using a quadratic transformation-based algorithm. We numerically demonstrate that the proposed algorithm outperforms other state-of-the-art algorithms.