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Two-Way OFDM-Based Nonlinear Amplify-and-Forward Relay Systems
Abstract— We derive closed-form outage probability expressions for fixed-gain (FG) and variable-gain (VG) two-way amplify-and-forward (AF) relay networks subject to a nonlinear transmission at the relay. We then derive an explicit expression for the relay gain that optimizes the network’s performance. Finally, we show that, if the source nodes have no access to the distortion characteristics of the relay’s amplifier, which inhibits self-interference removal, the network’s performance will change negligibly. Relay networks will be a vital part of future wireless systems due to the gain in diversity they can achieve and their ability to extend the coverage area of a network. Amplify-and-forward (AF) relay networks are particularly attractive when low-complexity/latency systems are required [3]. By employing network coding [4] at the relay of two-way systems, we can alleviate some of the shortcomings that occur in half-duplex networks, i.e., the requirement for two time slots per transmitted packet. Thus, two-way relaying can provide improved network performance compared with one-way relaying, and a thorough assessment of its theoretical behavior is necessary. < final year projects >
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