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How often channel estimation is needed in MIMO systems

: Pohl, V.; Nguyen, P.H.; Jungnickel, V.; Helmolt, C. von

IEEE Communications Society:
Communications. The global bridge. GLOBECOM 2003, IEEE Global Telecommunications Conference. Vol.2 : 1 - 5 December 2003, San Francisco, CA, USA
Piscataway, NJ: IEEE, 2003
ISBN: 0-7803-7974-8
ISBN: 0-7803-7975-6
Global Telecommunications Conference (GLOBECOM) <2003, San Francisco/Calif.>
Fraunhofer HHI ()

In this paper we develop a unique framework for evaluating the required repetition rate of channel estimation for multiple-input multiple-output (MIMO) systems in slowly fading radio channels. An analytical formula for the interference due to the temporal variation of the channel coefficients is given. This makes it possible to evaluate the time interval in which the channel has to be estimated again, in order to keep the error probability below a desired threshold. This interval depends not only on the Doppler spread of the channel but also on the antenna configuration, detection algorithm and modulation scheme.