Matrix division multiple access for mini centralized network

We consider a multiuser scenario with a center node for data fusion, where simultaneously transmitting is required in real time and with low probability of interception. We established a novel multiple access scheme, named matrix division multiple access (MDMA), based on OFDM technology. Precoded with different matrices, the signal from different end nodes can be distinguished due to the signal space division. At the receiver, the zero-forcing (ZF) and minimum mean square error (MMSE) decoding schemes are developed. Additionally, we analyze the sum capacity of the MDMA system. Simulations show that the MDMA scheme achieves the better performance compared to the OFDMA.