Precoder Based Transceivers Design for Non-Orthogonal Multiple Access Mixed Numerologies

Orthogonal Frequency Division Multiplexing (OFDM) based mixed numerology scheme and Non-Orthogonal Multiple Access (NOMA) are the two important key features of 5G radio standard capable of handling diversified service requirements. However, the mixed numerology scheme suffers from an inherent problem called Inter Numerology Interference (INI) that arises due to non-orthogonality issue between any two numerologies, whereas NOMA suffers from potential Bit Error Rate (BER). In this research work, transmitter architecture based on windowing and pre-coding techniques to mitigate the INI and two receiver architectures based on the principle of Successive Interference Cancellation (SIC) and Combined Maximum Likelihood (CDML) decoding are proposed for optimal decoding of the information. The proposed system model is designed to operate under mixed numerology NOMA scenario. The BER performance analysis is done for both the receivers and compared with each other and the conclusive remarks are drawn.