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Cooperative schemes for two-way relaying protocol

In this paper, three cooperative relaying schemes are proposed for relay networks comprised of two source terminals and multiple relays, each with single antenna. The new relaying schemes, corresponding to the maximum ratio combining of the downlink and uplink channels, phase rotation of the received signals at relays, and the channel gain equalization, are designed based on the maximization of the sum rate of the relay network subject to a total relay power constraint. Numerical simulations are conducted to illustrate the performance of the proposed schemes in terms of the capacity and the cumulative distribution function of the cooperative network.