Cell-free massive multiple-input multiple-output (MIMO) is a promising cellular technology in which a large number of distributed access points (APs) jointly serve a small number of user equipments (UEs). In this work, we investigate the impact of the spatial distribution of APs on the performance of a cell-free massive MIMO system, considering different downlink power control policies. Further, we analyze the performance for the case where only subsets of all APs serve the individual UEs: this scenario has lower backhaul requirements and associated CAPEX/OPEX costs. In this framework, we first propose a novel, tractable approximation for the average spectral efficiency (SE) of the transmission to a UE conditioned on the estimated channel gains. This approximation is then used to develop different downlink power control policies. Further, we extend the policies to the scenario when power control is coordinated only among subsets of APs and not across the subsets. Through extensive system-level simulations, we evaluate the improvement in SE by spreading out the APs and the SE loss when a subset of all APs serve a UE and coordination across subsets is absent.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Downlink Power Control in Cell-free Massive MIMO with Partially Distributed Access Points


    Contributors:


    Publication date :

    2019-09-01


    Size :

    571205 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Cell-Free Massive MIMO System With Dedicated Interference Cancellation Access Points

    Park, Sung-Min / Kim, Do-Yup / Kim, Kyeong-Won et al. | IEEE | 2023


    Downlink Performance Analysis of Cell-Free Massive MIMO with Finite Fronthaul Capacity

    Parida, Priyabrata / Dhillon, Harpreet S. / Molisch, Andreas F. | IEEE | 2018



    Achievable Rate of Multi-Cell Downlink Massive MIMO Systems with D2D Underly

    Al-Rimawi, Ashraf / Ibrahim, Laith / Ajib, Wessam | IEEE | 2020


    Clustering Method in Downlink Cell-Free MIMO Using Layered Partially Non-orthogonal ZF-Based Beamforming

    Ishii, Daisuke / Hara, Takanori / Nonaka, Nobuhide et al. | IEEE | 2023