Table 1 Comparison of the computational complexities
From: DFT codebook-based hybrid precoding for multiuser mmWave massive MIMO systems
Algorithm | Median operation |
|---|---|
Proposed DFT hybrid | \( \mathcal{O}\left({N}_{\mathrm{BS}}{U}^2+{U}^2\right) \) |
Full digital algorithm | \( \mathcal{O}\left({N}_{\mathrm{BS}}^3\right) \) |
Exhausted searching hybrid | \( \mathcal{O}\left({N}_{\mathrm{BS}}{U}^2+{C}_{N_{\mathrm{BS}}}^{N_{\mathrm{RF}}}\right) \) |
Beamsteering hybrid in [4] | \( O\left({N}_{\mathrm{BS}}^2{U}^2\right) \) |
802.15.3c hybrid in [5] | \( \mathcal{O}\left({N}_{\mathrm{BS}}{U}^2+{U}^2\right) \) |
Q-bit resolution hybrid in [7] | \( \mathcal{O}\left({N}_{\mathrm{BS}}{U}^2+{U}^2\right) \) |
JWSPD hybrid in [11] | \( \mathcal{O}\left({N}_{\mathrm{BS}}^4{U}^4\right) \) |