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Measurement of keyhole effect in a wireless multiple-input multiple-output (MIMO) channel

Publiceringsår: 2003
Språk: Engelska
Sidor: 373-375
Publikation/Tidskrift/Serie: IEEE Communications Letters
Volym: 7
Nummer: 8
Dokumenttyp: Artikel i tidskrift
Förlag: IEEE--Institute of Electrical and Electronics Engineers Inc.


It has been predicted theoretically that for some environments, the capacity of wireless multiple-input multiple-output systems can become very low even for uncorrelated signals; this effect has been termed "keyhole" or "pinhole." In this letter, We present the (to our knowledge) first measurement of this effect. The measurements are done in a controlled indoor environment, with transmitter and receiver in two adjacent rooms. One of the rooms is shielded, and propagation to, the other room can occur only through a hole or a waveguide in the wall. We find that only the waveguide leads to an unambiguous keyhole, while a hole of the same size still allows multimodal propagation. Measurement of amplitude statistics also confirm theoretical predictions.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • eigenvalues
  • double complex Gaussian
  • keyhole
  • multiple-input multiple-output (MIMO)
  • measurements


  • ISSN: 1089-7798

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