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We consider a bi-directional Full-Duplex (FD) Multiple-Input Multiple-Output(MIMO) communication system in which nodes are capable of performing transitter(TX)- Receiver (RX) digital precoding/combining and multi-tap analogcancellation, and have individual Signal-to-Interference-plus-Noise Ratio(SINR) requirements. We present an iterative algorithm for the TX powersminimization that includes closed-form expressions for the TX/RX digitalbeamformers at each algorithmic iteration step. Our representative simulationresults demonstrate that the proposed algorithm can reduce residualSelf-Interference (SI) due to FD operation to below -110dB, which is thetypical noise floor level for wireless communications. In addition, our designoutperforms relevant recent solutions proposed for 2-user MIMO systems (the socalled MIMO X channel) in terms of both power efficiency and computationalcomplexity.

Full-Duplex Transmission Optimization for Bi-directional MIMO links with QoS Guarantees