Transmission Subspace Tracking for MIMO Systems With Low-Rate Feedback

@article{Yang2007TransmissionST,
  title={Transmission Subspace Tracking for MIMO Systems With Low-Rate Feedback},
  author={Jingnong Yang and Douglas B. Williams},
  journal={IEEE Transactions on Communications},
  year={2007},
  volume={55},
  pages={1629-1639}
}
This paper describes a feedback algorithm for tracking the dominant subspaces of continuously time-varying channels in multiantenna communication systems. The nature of the problem is quantization of subspaces. It is well known that subspaces can be mathematically modeled as points in a Grassmann manifold. We model the variations between the dominant subspaces of channels at adjacent time instants to be along geodesics in the Grassmann manifold. Instead of quantizing the subspaces themselves… CONTINUE READING
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