Interference Leakage Minimization in RIS-Assisted MIMO Interference Channels
Ignacio Santamarı́a, Mohammad Soleymani, Eduard A. Jorswieck, Jesús Gutiérrez
Abstract
We address the problem of interference leakage (IL) minimization in the K-user multiple-input multiple-output (MIMO) interference channel (IC) assisted by a reconfigurable intelligent surface (RIS). We describe an iterative algorithm based on block coordinate descent to minimize the IL cost function. A reformulation of the problem provides a geometric interpretation and shows interesting connections with envelope precoding and phase-only zero-forcing beamforming problems. As a result of this analysis, we derive a set of necessary (but not sufficient) conditions for a phase-optimized RIS to be able to perfectly cancel the interference on the K-user MIMO IC.
Topics & Concepts
MIMOPrecodingInterference (communication)BeamformingLeakage (economics)Zero-forcing precodingComputer scienceMulti-user MIMOMinificationElectronic engineeringCoordinate descentEnvelope (radar)AlgorithmChannel (broadcasting)Topology (electrical circuits)Control theory (sociology)TelecommunicationsEngineeringElectrical engineeringArtificial intelligenceEconomicsControl (management)MacroeconomicsRadarProgramming languageAdvanced Wireless Communication TechnologiesAntenna Design and AnalysisWireless Communication Security Techniques