From: Performance limits of conventional and widely linear DFT-precoded-OFDM receivers in wideband frequency-selective channels
Receiver type
Gap for N r = 1
Gap for N r = 2
Conv ZF-LE
NA
3.0
Conv ZF-DFE
2.5
1.19
WL ZF-LE
1.25
WL ZF-DFE
1.17
0.5644