Low-Density Spreading Design Based on an Algebraic Scheme for NOMA Systems

TL;DR

This paper introduces an algebraic scheme for designing low-density spreading sequences in NOMA systems, improving bit error rate performance over fading and noise channels by leveraging projective geometry.

Contribution

It proposes a novel LDS sequence design based on algebraic and geometric principles, enhancing existing NOMA spreading schemes.

Findings

Improved LDS sequences outperform existing designs in BER.

Performance gains are demonstrated over Rayleigh fading and AWGN channels.

Optimal BER depends on the minimum distance of the sequence set.

Abstract

NOMA) technique based on an algebraic design is studied. We propose an improved low-density spreading (LDS) sequence design based on projective geometry. In terms of its bit error rate (BER) performance, our proposed improved LDS code set outperforms the existing LDS designs over the frequency nonselective Rayleigh fading and additive white Gaussian noise (AWGN) channels. We demonstrated that achieving the best BER depends on the minimum distance.