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Table 3 Complexity comparison between the RBF and the SUS-ee

From: Low-complexity multiuser MIMO downlink system based on a small-sized CQI quantizer

  RBF SUS-ee
   Pre-coding N/A M × M matrix inversion
   User selection Simple magnitude comparison between quantized CQIs from K users Vector computations are needed between the previously selected users and the rest of the users until constructing users up to M
   Feed-forward information One desired effective channel out of M = 4 effective channels One desired effective channel out of 2 B CDI effective channels
   Finding feedback information Compute M = 4 combining vectors and CQIs Compute 2 B CDI combining vectors and CQIs