Abstract
Two-way relay X networks offer a higher degrees of freedom, in contrast to traditional wireless communication networks. The relay processing based on zero forcing only considers the interference, ignoring the desired signal, so that the sum rate of the network to be improved. Specifically, the lower user transmission power, the greater disadvantages. The interference alignment scheme was researched for asymmetric two-way relaying X networks, moreover the relay beamforming technique based on the desired signal and interference signal was also presented. Firstly, a mathematical model was obtained for the network sum rate by the spatial relationship between user signal vectors. Then, the relay beamforming scheme based on sum rate maximization was transformed into a linear search for the optimal value through the matrix analysis and numerical analysis theory, and the objective function of the network was approximated by the limitation. Furthermore, the objective function was approximated by the linear combinations of parameters of one-way network. Finally, the relay precoder matrix to maximize the sum rate was obtained. Simulation results show that the proposed scheme significantly improved the network rate compared with existing relay processing scheme, while simplifying the complexity of the algorithm.
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