An Efficient Manifold Algorithm for Constructive Interference Based Constant Envelope Precoding

@article{Liu2017AnEM,
  title={An Efficient Manifold Algorithm for Constructive Interference Based Constant Envelope Precoding},
  author={Fan Liu and Christos Masouros and Pierluigi Vito Amadori and Huafei Sun},
  journal={IEEE Signal Processing Letters},
  year={2017},
  volume={24},
  pages={1542-1546}
}
In this letter, we propose a novel manifold-based algorithm to solve the constant envelope (CE) precoding problem with interference exploitation. For a given power budget, we design the precoded symbols subject to the CE constraints, such that the constructive effect of the multiuser interference is maximized. While the objective function for the original problem is not complex differentiable, we consider the smooth approximation of its real representation, and map it onto a Riemannian manifold… 

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