Javascript verkar inte påslaget? - Vissa delar av Lunds universitets webbplats fungerar inte optimalt utan javascript, kontrollera din webbläsares inställningar.
Du är här

Rate of MIMO Systems with CSI at Transmitter and Receiver from Pilot-Aided Estimation

  • N B Mehta
  • F Digham
  • Andreas Molisch
  • J Zhang
Publiceringsår: 2004
Språk: Engelska
Sidor: 1575-1579
Publikation/Tidskrift/Serie: IEEE 60th Vehicular Technology Conference, VTC 2004-Fall.
Volym: 3
Dokumenttyp: Konferensbidrag


We consider realistic multiple input multiple output antenna systems operating over spatially colored channels with instantaneous, albeit imperfect, channel state information at the receiver and only covariance knowledge available at the transmitter. We focus on pilot-aided channel estimation in which the receiver uses minimum mean square error channel estimation. For such a setup, our goal is then to design both the pilot and data sequences optimally to maximize the information rates achievable over the channel. We first demonstrate that the estimation error cannot be modeled as additive white Gaussian noise. We adopt a lower bound on channel capacity with imperfect channel knowledge and show that an optimum design leads to a matching of the eigenspaces of the pilots and of the data to the eigenspace of the channel. Furthermore, the ranks of the pilot and data covariance matrices need to be equal, and the optimal training duration need only equal the above rank. The assignment of powers to the different modes of transmission can then be obtained numerically. The paper, in essence, extends the results in the literature that assume perfect channel knowledge at the receiver, and shows that fully exploiting covariance knowledge leads to a visible improvement in capacity when compared to schemes that assume no channel knowledge, whatsoever, at the transmitter.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • channel estimation
  • covariance matrices
  • eigenvalues and eigenfunctions
  • least mean squares methods
  • optimisation
  • radio receivers
  • radio transmitters
  • channel capacity
  • MIMO systems


IEEE Vehicular Technology Conference, VTC Fall, 2004
  • ISSN: 1090-3038
  • ISBN: 0-7803-8521-7

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen