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A relay-aided interference alignment algorithm for SISO system

In this paper, we research a (1×1, 1/2)3 symmetric wireless interference network with a relay, and analyze the necessity of using relay in interference alignment for SISO wireless system. Comprehensively considering the biggest chord distance of all the users, we propose an optimization distributed interference alignment algorithm. Based on the optimization algorithm and adding relay, we can realize interference alignment only requiring two time slots extension for the network, and can achieve 1/2 Degrees of freedom for each user. Simulation results justify that using relay and optimization algorithm can significantly improve the capacity and energy efficiency of the system.