Abstract
In this paper we consider heterogeneous cellular network with a number of millimeter-wave (mmWave) small cells overlaying LTE macro cells. The impact of mutual interference in millimeter-wave band (57–64 GHz) is addressed and evaluated. We introduce several active interference cancellation techniques which are implemented at TX sides of mmWave small cell BSs equipped with adaptive antenna arrays. We started from the task of multi-stream intra-cell interference suppression in MU-MIMO mode by means of well-known Zero-Forcing (ZF) algorithm. Then more complex schemes involving coordinated multi-point (CoMP) operation of several neighboring BSs with Coordinated Scheduling (CS) and Coordinated Beamforming (CB) are investigated. Finally, performance evaluation and comprehensive comparative analysis are done by simulations for different mmWave small cell sizes and densification. Presented results allow to establish lower and upper bounds of interference impact and make reasonable selection of the suitable interference mitigation technique for mmWave overlaying network.
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