Design of power domain non-orthogonal demodulation based on OFDM system
He Liu, Xu Li · Third International Symposium on Computer Engineering and Intelligent Communications (ISCEIC 2022) · 2023
In mobile ad-hoc networks, OFDM technology is widely used, and in order to improve system capacity and reduce the problem of multiple retransmissions caused by collisions, non-orthogonal multiple access technology is usually used, which leads to non-orthogonal aliasing at the receiver of the OFDM system. In order to solve the aliasing signal separation problem of OFDM system, SIC(successful interference cancellation) technology, a non-orthogonal demodulation method based on OFDM system is proposed in this paper, according to the channel error vector magnitude (EVM), selecting sub-carrier blocks with better channel conditions for transmission, focusing on the use of subcarrier block SIC solution when there is non-orthogonal aliasing in the power domain at the receiver under strict synchronization. The simulation results show that, in this case, the aliasing signal separation technology for OFDM system adopted in this paper can not only improve the system capacity and improve the bit error performance, but also easy to implement in engineering.