NOMA-NR-FOFDM Performance Enhancement-Based Sub-band Filtering

Abstract

The orthogonal multiple access (OMA) used in fifth generation (5G) is suffered from limited resources. Due to the increasing number of users and ultra-high data rate requirements for user applications, non-orthogonal multiple access (NOMA) is a promising scheme for future communication systems. NOMA suffered from inter-user interference due to non-orthogonal resource sharing. This paper proposes the enhanced NOMA technique to be employed in the 5G system to satisfy the data rate requirements for Beyond 5G (B5G). The performance improvement is achieved through incorporating the filtering techniques with the new-radio orthogonal frequency division multiplexing (NR-OFDM) in 5G used waveform. The limitation in high out of band emission (OOBE) in the existing waveforms can also be reduced through the proposed method. Performance evaluation of the proposed system is demonstrated, and the results proved an improvement in bit error rate (BER) and power spectral density (PSD). As compared with the literature, the proposed system provides almost the same error floor with a benefit of approximately 11dB and 17dB SNR for full-band and sub-band-based filtering techniques, respectively. The achieved side lobe gain is up to 257dB for the Kaiser-Chebyshev-based filtering method.

Joint MU-mMIMO-OFDM with Hybrid Beamforming System Spectral Efficiency Improvement based NOMA Technique

“…It enables more users to share the available resources efficiently. Power and code domains are the two main types of NOMA [22,23]. The power domain NOMA technique is used in this paper due to its compatibility with the current wireless generation.…”