Feedback-aided selective subspace retransmission for outage-free spatial multiplexing

  title={Feedback-aided selective subspace retransmission for outage-free spatial multiplexing},
  author={Thomas Hunziker and Thomas Edlich and Dirk Dahlhaus},
  journal={2007 6th International Conference on Information, Communications & Signal Processing},
We study a novel spatial multiplexing scheme for a multiple-input/multiple-output (MIMO) architecture with vertical coding and a feedback channel. Rather than for sending back channel state information (CSI), the feedback channel is used to request the retransmission of signal parts in critical signal subspaces. This enables the receiver to perform linear reconstruction of the layered signals without the destructive noise enhancement in ill-conditioned channel matrices that is experienced with… CONTINUE READING


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