Millimeter-wave (mmWave) communications, along with massive multiple-input multiple-output (MIMO) systems, are recently being considered extensively as enabling technologies for emerging 5G cellular networks. The existing literature shows that the capacity in massive MIMO systems is limited by the pilot contamination effect, caused by the reuse of pilot sequences during the uplink channel estimation stage. It has also been proved that the pilot contamination effect increases with the angular spread (AS) of the multipath clusters. In this work, we study the relation between the AS and the capacity of a cellular network, where we show that there exists an optimal AS that maximizes the capacity. Furthermore, we observe that the optimal AS depends on the specific configuration of the network, such as the number of antennas installed at the base station, and the number of cells and users per cell. Since the AS depends on the operating frequency, we argue that the system capacity can be maximized by proper selection of the carrier frequency.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Optimal Angular Spread of the Multipath Clusters in mmWave Systems under Pilot Contamination


    Contributors:


    Publication date :

    2017-09-01


    Size :

    224296 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Multipath Assisted Near-Field Localization for STAR-RIS Based mmWave Systems

    Li, Binliang / Zhang, Fengjiao / Zhao, Ming-Min et al. | IEEE | 2024




    Spread-spectrum ranging multipath model validation

    Braasch, M.S. / DiBenedetto, M.F. | IEEE | 2001


    Performance of Spread-Spectrum Systems in a Multipath Environment

    Feldman, Nathaniel E. / Kelly, Charles M. | AIAA | 1971