Some 5G challenges at the beginning of the project

  •  New frequencies: Higher frequencies and larger bandwidths
    • mmWave transmissions for both indoor and outdoor
    • since the beginning of the project:  26GHz and 72 GHz bands have been defined
  • Improvment of the spectral efficiency
    • By increasing the number of antennas: massive MIMO

Main challenges for M5HESTIA  project

  1. Improve the link budget
    • The high path losses in millimeterwave   impose to use directive antenna with very high gains to ensure a sufficient SNR (Signal to Noise Ratio)
    • HW implementation is very critical: calibration, interference, integration losses…
  2. Increase of the number of  antennas
    • Massive MIMO: main theoretical studies assume as many RF chains as many antennas but increasing the number of antenna RF chains at high frequencies lead to a lot of problems such as the complexity in terms of algorithms and HW integration, the system consumption…
    • Hybrid massive MIMO
      • less number of RF chains, several antennas linked to one RF chain
      • optimisation: trade-off between the number of antennas and the number of RF chains
  3. Channel measurements and channel modelling
    • Need of channel models for theoretical studies
      • Development of a deterministic channel simulator well suited for 5G mmW scenarios
    • Need of new channel sounders: in both elevation and azimuth, for both indoor and outdoor communications
      • Exploitation of indoor and outdoor data from Aalto University
    •  Need of tracking position and orientation algorithm studies
  4. Develop  proofs of concept by designing one HW platform that integrates powerful analog and digital parts
    • To Implement new enablers
    • To integrate new services
    • To validate the use of new frequencies
    • To make experiments


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