Integrated Radio Resource and Cluster Allocation for Scalable mmWave Distributed MIMO

This paper presents a novel radio resource allocation method for uplink scalable mmWave distributed MIMO (D-MIMO). The user-cluster-centric (UCC) partial minimum mean square error combining ($\mathrm{P}-\mathrm{MMSE}$) is a scalable reception scheme in large D-MIMO. However, the cluster-wise operation of the UCC approach causes performance degradation due to high intra- and inter-cluster interferences under high-user-density environments. In order to suppress the occurrence of both types of interferences, we propose an integrated radio resource and cluster allocation method that maximizes the performance of UCC-P-MMSE. The proposed method enables efficient suppression of the interference using two adjustable thresholds considering intra- and inter-cluster interferences. System-level simulations assuming an uplink mmWave D-MIMO system demonstrate that the proposed method improves a 5% -tile user throughput by $\mathrm{6 0 \%}$ compared to a conventional UCC-P-MMSE by avoiding the significant interference.