  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.
