@article{twostepcodeworddesignformillimeterwave,
  title = {Two-Step Codeword Design for Millimeter Wave Massive MIMO Systems with Quantized Phase Shifters},
  year = {2020},
  eprint = {2002.06351},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/2002.06351v1},
}