Implementation of NPS Precoding for Computational Complexity and PAPR Analysis of Uplink NOMA

Future multimedia and entertainment services demand fast and massive connectivity simultaneously. NOMA is a promising candidate to achieve massive connectivity and high spectral efficiency for future interference less communications. However, new signal precoding problems need to be resolved for obtaining the complete advantages from NOMA technologies for future deployments of 5G/6G. Traditionally, DFT, cyclic shift and HT precoding techniques are utilized in NOMA for obtaining less PAPR and negligibly minimum errors. Choosing appropriate data resource block size is the main optimization problem in DFT precoding. Error correction in cyclic shift is more computationally complex which cannot be used in novel NOMA output system. Less energy compacting is the major disadvantage of HT transform. The proposed NOMA precoding technique utilizes Newman Phase Spread (NPS) concept with power domain superposition coding (SC) on transmitter. IFWFT and FWFT is used in time to frequency and vice versa to reduce the complexity of NPS based NOMA. This work differentiates moderate user from secondary and primary users. The proposed NPS gives the reduced PAPR value of nearly 5.2 dB which is comparatively low when compared to all other NOMA techniques.