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Table 1 The proposed CQI quantizer (RBF)

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

  1-bit quantizer (N = M) 1-bit quantizer (N= M- 1)
Level 1 0<x<0.8 5 2 γ 4 : Q 4 0<x<0.8 5 2 γ κ : Q κ ( QBC : κ = 2 , MESC : κ = 3 )
Level 2 0.8 5 2 γ 4 : Q 4 x< 0.8 5 2 γ κ : Q κ x< ( QBC : κ = 2 , MESC : κ = 3 )
  2-bit quantizer ( N = M ) 2-bit quantizer ( N = M - 1)
Level 1 0<x<0. 8 2 γ 4 : Q 4 0<x<0. 8 2 γ 3 : Q 3
Level 2 0. 8 2 γ 4 : Q 4 x<0.8 5 2 γ 3 : Q 3 0. 8 2 γ 3 : Q 3 x<0. 9 2 γ 2 : Q 2
Level 3 0.8 5 2 γ 3 : Q 3 x<0. 9 2 γ 1 : Q 1 0. 9 2 γ 2 : Q 2 x< γ 1 : Q 1
Level 4 0. 9 2 γ 1 : Q 1 x< γ 1 : Q 1 x<
Expected γ a : Q a =2 σ 2 ρlog Q a γ a : Q a = 2 σ 2 ρ [ log ( ( 3 2 ) Q a 2 σ 2 ρ ) log [ log ( ( 3 2 ) Q a 2 σ 2 ρ ) + 1 2 σ 2 ρ ] ]
CQI