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In this paper we deal with amultiple-input multiple-output (MIMO)
multiuser broadcast channel (BC) featuring linear precoding at the
transmitter. The design of such precoder is performed according
to the channel state information (CSI) sent by the different users
through parallel feedback links. A general feedback framework based
on the quantization of each user’s channel Gram matrix is presented.
Once the channel Gram matrices are available at the transmitter, they
can be used to compute equivalent triangular MIMO channels for
which the optimum precoder is calculated. As an application of this
framework, a robust precoder design that takes into account errors in
the CSI that are originated, for example, from the finite-bit quantization
process applied in the feedback, is also presented. Finally the
benefits of the proposed robust strategy are evaluated by means of
CitationSacristán Murga, D.; Payaró, M.; Pascual Iserte, A. Robust linear precoding for MSE minimization in MIMO broadcast systems with channel Gram matrix feedback. A: IEEE International Workshop on Signal Processing Advances in Wireless Communications. "IEEE 12th International Workshop on Signal Processing Advances in Wireless Communications". San Francisco: IEEE, 2011, p. 331-335.
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