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In this paper, we study many antenna beamforming algorithm research in cognitive radio two-way relay system. In this system, two primary users exchange information by second users, and the second users to configure multiple antennas, a user through the superposition signal sends it to the primary users, therefore in this article research the key problem is how to divide the primary user information of the signal power and power of user information signal; How to design the main users of beamforming matrix; How to design the beam forming matrix of users. This paper uses the maximum system capacity optimization guidelines, even is a convex optimization problem, this paper adopts positive semidefinite optimization and second-order cone optimization, closed solution is obtained. The simulation results show that this method due to previous beam forming algorithm.

An Beamforming Algorithm on Limited Feedback MIMO two-Way Relay Cognitive Networks