5G Research

MIMO

Stairs landing in Dipoli with people sitting in two armchairs and looking at a painting / photo by Aalto University, Tuomas Uusheimo

Practical Massive MIMO

  • Remove the pilot contamination problem
    • Channel estimation based on subspace approach, random matrix theory
  • Codebooks for massive MIMO

    • Closed form low coherence frames / Grassmannian codebooks for k-dimensional subspaces in 2m–dimensional spaces, some optimal
    • Stiefel & Grassmannian codebooks
    • Convergence of gradient search for low-dimensional matrix completion in high-dimensional spaces
    • Minimum distance bounds on Stiefel and Grassmannian manifolds
  • Distributed Antenna Systems (DAS)

    • Over the air synchronization of remote radio units
    • Centralized base band processing
  • Published:
  • Updated:
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