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

Abstract

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 (Pe) for both MTD and successive interference cancellation (SIC) with statistical CSI is calculated. Then, we use the obtained Pe expression to fairly allocate power to different users in the sense that the maximum Pe 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.