Table 1 Simulation parameters

Number of OFDM symbols

\({10}^{5}\)

Number of subcarriers (\(\mathrm{K}\))

256

Number of data subcarriers (\({\mathrm{K}}_{D}\))

200

Channel

Multipath (Rayleigh channel)

Channel estimation

Ideal

Path loss exponent (\(\propto\))

2.8

Number of users (\(\mathrm{M}\))

2

Space between users (meters)

50

Power allocation ratios (\({\mathrm{\alpha }}_{\mathrm{FU}}/{\mathrm{\alpha }}_{\mathrm{NU}}\))

(0.8/.2)

HPA model

Soft limiter (SL)

Oversampling factor (\(\mathrm{L}\))

4

Number of alternatives (\(I\))

16, 64, and 256

Modulation type and order (FU/NU)

(4-QAM/4-QAM)

(4-QAM/16-QAM)

(4-QAM/64-QAM)

IBO (\(\mathrm{dB}\))

2

4

5