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G. Koliander, E. Riegler, G. Durisi, V. Morgenshtern, F. Hlawatsch:
"A Lower Bound on the Noncoherent Capacity Pre-log for the MIMO Channel with Temporally Correlated Fading";
Talk: Allerton Conference on Communication, Control, and Computing, Monticello, IL, USA; 10-01-2012 - 10-05-2012; in: "50th Annual Allerton Conference on Communication, Control, and Computing", (2012), ISBN: 978-1-4673-4537-8; 1198 - 1205.

We derive a lower bound on the capacity pre-log
of a temporally correlated Rayleigh block-fading multiple-input
multiple-output (MIMO) channel with T transmit antennas and
R receive antennas in the noncoherent setting (no a priori
channel knowledge at the transmitter and the receiver). In
this model, the fading process changes independently across
blocks of length L and is temporally correlated within each
block for each transmit-receive antenna pair, with a given rank
Q of the corresponding correlation matrix. Our result implies
that for almost all choices of the coloring matrix that models
the temporal correlation, the pre-log can be lower-bounded by
T(1 - 1/L) for T <= (L - 1)/Q provided that R is sufficiently
large. The widely used constant block-fading model is equivalent
to the temporally correlated block-fading model with Q = 1
for the special case when the temporal correlation for each
transmit-receive antenna pair is the same, which is unlikely to
be observed in practice. For the constant block-fading model,
the capacity pre-log is given by T(1 - T/L), which is smaller
than our lower bound for the case Q = 1. Thus, our result
suggests that the assumptions underlying the constant blockfading
model lead to a pessimistic result for the capacity pre-log.

information theory, noncoherent communication, MIMO

http://dx.doi.org/10.1109/Allerton.2012.6483354

http://publik.tuwien.ac.at/files/PubDat_211866.pdf

Project Head Erwin Herbert Riegler:
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