Multi-Threshold Detector With Fair Power Allocation Coefficients for NOMA Signals With Statistical CSI

In this letter, we modify the multi-threshold detector (MTD) for detection of downlink non-orthogonal multiple access (NOMA) signals in the Rician fading channel with statistical knowledge of channel state information (CSI). First, the error probability (
$P_{e} $
) for both MTD and successive interference cancellation (SIC) with statistical CSI is calculated. Then, we use the obtained
$P_{e} $
expression to fairly allocate power to different users in the sense that the maximum
$P_{e} $
of the users is minimized. Finally, computer simulations are performed, which show that MTD outperforms the SIC in the case that error propagation happens in the noise-free SIC.