QRD-BASED SIGNAL DETECTION FOR MIMO-NOMA SYSTEMS

In a multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) system, interference at the receiver can severely impact the successful decoding of the received signal. Transmit precoding has been widely used to address this issue. However, it requires the base station to acquire global channel state information (CSI) prior to transmission, which increases system overhead. Furthermore, precoding techniques are unable to effectively remove inter-cluster interference and restrict the number of receiving antennas. Consequently, the overall system performance suffers significant degradation. To overcome these limitations, we propose a MIMO detection technology that empowers users to eliminate interference autonomously. This approach eliminates the need for returning global CSI and ensures complete interference elimination. Additionally, it offers flexibility in adjusting the number of receiving antennas, providing greater adaptability in diverse scenarios. To evaluate the performance of the proposed detection technology, we conduct mathematical analyses on outage probability and throughput. Furthermore, we perform numerical simulations to compare the performance of different detection methods in order to validate the effectiveness of our approach and highlight its superior performance compared to existing detection methods.