Performance Analysis for Massive MIMO Downlink With Low Complexity Approximate Zero-Forcing Precoding

  title={Performance Analysis for Massive MIMO Downlink With Low Complexity Approximate Zero-Forcing Precoding},
  author={Cheng Zhang and Yindi Jing and Yongming Huang and Luxi Yang},
  journal={IEEE Transactions on Communications},
Zero-forcing (ZF) precoding plays an important role for massive MIMO downlink due to its near optimal performance. However, the high computation cost of the involved matrix inversion hinders its application. In this paper, we adopt the first order Neumann series (NS) for a low-complexity approximation. By introducing a relaxation parameter jointly with the channel non-orthogonality between one selected user and others into the precondition matrix, we propose the identity-plus-column NS (ICNS… 

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