State of the art in 2015 and 2019

State of the Art at the beginning of the project (2015)

  • WP2: antenna for channel sounding, massive MIMO antenna
    • NOKIA mmWave system (2015) at 73,5 GHz
      • No spatial multiplexing, one single RF port
      • Mutibeam capability in one direction  at the same time
    • NIST 60GHz sounder with fixed beams (2015)
  • WP3: channel models in mmWave
    • Few channel measurements and modelling with large antenna arrays
    • No channel model for Massive MIMO
  • WP4: massive-MIMO for mmWave
    • Massive MIMO studies: mainly theoretical, do not take into account number of RF chains limitation and the specificities of mmWave propagation
    • Emergence ot the Hybrid Beamforming Concept
  • WP5: existing platforms
    • Mostly M-MIMO below 6 GHz (5G system)
    • M-MIMO in mm waves for indoor systems : IEEE 802.11ad (WiGig) – 4.6 Gbps max

A more detailed “State Of the Art” was  provided at the beginning of the project (available in pdf format): SoA_2015

A list of  projects dedicated to mmWave or massive MIMO was also provided (available in pdf format): M5HESTIA_Other_projects

Today’s state of the art (Oct. 2019)

  • Antennas for channel sounding and transmission
    • Tokyo Institute of Technology 2019 : Chip 802.11.ay without beamforming
    • No complete front-end RF with simultaneous beams
    • M5HESTIA: antennas for channel sounding at 60GHz, antenna for M-MIMO (8 RF chains in parallel) [Pham19a,19b,19c, Guer19] 
  • Channel modelling and mesurements
    • Still few channel measurements and modelling with large antenna arrays
    • M5HESTIA: improvement of the existing channel modelling (PyLayer) and contribution to mobility scenarios [Shah19, Bald19] 
  • Baseband signal processing
    • Mixed analog/digital or hybrid architectures  widely assumed for communicating systems based on large-scale antenna arrays, especially for mmWaves.
    • Various theoretical results for Massive MIMO systems relying on the today’s common assumption of (sparse) ray and cluster based channel representations in mmWaves
    • Confirmation of the interest for a two-stage precoding/beamforming strategy: both analog and digital precodings (5G)
    • M5HESTIA: New results in terms of theoretical performance and algorithms for M-MIMO systems taking into account mmWave propagation characteristics and relying on hybrid precoding and/or spatial modulation  [Sheh17, 18a, 18b, 18c, 19a, 19b, 19c, Mokh19]
  • mmWave M-MIMO plateforms
    • 5G proposes 26 GHz (over up to 400 MHz) for outdoor transmission (gNodeB)
    • Hybrid M-MIMO system up to 256 antenna array (with lens) -> Identical direction as M5HESTIA
    • M5HESTIA: integration of the antennas in the b<>com platform for beamsteering allowing 2 parallel beams in a 2GHz bandwidth

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