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In this paper, we consider a network-coded cooperative wireless network, where users mutually pair among\udthemselves to realize network coding. We assume a multi-user environment, where users transmit to a common\uddestination in the absence of dedicated relaying nodes. We address the important problem of the mutual pairing\udof users, which directly governs the overall network performance. An optimal user pairing algorithm is proposed\udand tailored to maximize the network capacity. Next, we develop heuristic user pairing schemes, which\uddemonstrate near-optimal performance at significantly reduced computational complexity. In particular, we propose\udmax-max pairing to maximize the network capacity and max-min pairing to minimize the outage probability. We\udthen consider power minimization for energy-constrained networks. A joint optimization problem is formulated and\udsolved to find the pairing which maximizes the network capacity and minimizes the transmission power, while\udmeeting certain network performance constraint, such as in terms of the minimum average capacity per user or\udmaximum average outage probability per user

User pairing in cooperative wireless network coding with network performance optimization