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Table 1 Pilot cost comparison

From: Deep double-pilot-based hybrid precoding in UAV-enabled mmWave massive MIMO

Pilots required
Method Period
  A period of the beam sampling step A period of prediction period
Proposed \({N_t}^2+N_{RF}^2(R_{\mathrm{smpl}}-1)\) \(N_{RF}^2\)
Taylor expansion \({N_t}^2R_{\mathrm{smpl}}\) \({N_t}^2\)