Literature Database Entry

lazarev2025simulation

Vladimir Lazarev, "Simulation of cell-free Wi-Fi," Bachelor Thesis, School of Electrical Engineering and Computer Science (EECS), TU Berlin (TUB), June 2025. (Advisor: Anatolij Zubow; Referees: Falko Dressler and Thomas Sikora)

Abstract

This thesis presents a PHY-layer Monte Carlo simulation of distributed Multi-User Multiple Input Multiple Output (MU-MIMO) Wi-Fi based on the IEEE 802.11ac standard. The goal is to evaluate how a cell-free architecture compares to conventional co-located MIMO arrays and Frequency-Division Multiple Access (FDMA)-based Single Input Single Output (SISO) setups in realistic indoor environments. The simulation is implemented in MATLAB and uses a deterministic ray-tracing channel model to capture spatial geometry and signal propagation. Three transmission schemes are compared: FDMA SISO, conventional MU-MIMO with co-located antennas, and distributed MU-MIMO using either Zero Forcing (ZF) or Multiuser Eigenmode Transmission (MET) precoding. For each scenario, user positions are randomly generated once per drop, and various throughput metrics such as mean and median are computed based on the resulting performance. Several hundreds of drops are done to achieve meaningful results. The results show that a cell-free architecture provides a 9–40% gain in median sum throughput compared to a co-located MIMO array, and a 110–133% gain over distributed SISO. Even when accounting for sounding overhead and channel coherence time, the distributed setup offers clear benefits in dense indoor scenarios, especially when more transmit antennas are available. These findings support the idea that distributed MU-MIMO, already explored in cellular networks, can bring similar gains to Wi-Fi systems—especially when combined with fiber-based backhaul for tight synchronization.

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Vladimir Lazarev

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@phdthesis{lazarev2025simulation,
    author = {Lazarev, Vladimir},
    title = {{Simulation of cell-free Wi-Fi}},
    advisor = {Zubow, Anatolij},
    institution = {School of Electrical Engineering and Computer Science (EECS)},
    location = {Berlin, Germany},
    month = {6},
    referee = {Dressler, Falko and Sikora, Thomas},
    school = {TU Berlin (TUB)},
    type = {Bachelor Thesis},
    year = {2025},
   }
   
   

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Last modified: 2026-04-20