ABOUT THIS TUTORIAL
The limitations of MIMOs relying on
co-located array-elements are highlighted and it is shown, how the
single-antenna-aided cooperative mobiles may circumvent these
limitations by forming MIMOs having distributed elements. This concept
is also referred to a Virtual Antenna Arrays (VAA). Then the
corresponding amplify-forward and decode-forward protocols as well as
their hybrids are studied. Channel coding has to be specifically
designed for the VAAs in order to prevent avalanche-like
error-propagation. Hence sophisticated three-stage-concatenated
iterative channel coding schemes are proposed and it is argued that in
the absence of accurate channel information at the relays the best way
forward might be to use multiple-symbol differential detection. Indeed,
it is rather unrealistic to expect that an altruistically relaying
handset would also accurately estimate the source-relay channel for the
sake of high-integrity coherent detection. EXIT-chart-aided designs are
used for creating near-capacity solutions and a range of future research
directions as well as open problems are stated.
Free access for a limited time only!
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