Abstract
Cooperative non-orthogonal multiple access (NOMA) is a technology that addresses many challenges in future wireless generation networks by delivering a large amount of connectivity and huge system capacity. The aim of this paper is to design the varied distances and power location coefficients for far users. In addition, this paper aims to evaluate the outage probability (OP) performance against a signal-to-noise ratio (SNR) for a 6G downlink (DL) NOMA power domain (PD) and DL cooperative NOMA PD networks. We combine a DL cooperative NOMA with a 16 x 16, a 32 x 23, and a 64 x 64 multiple-input multiple-output (MIMO) and a 128 x 128, a 256 x 256, and a 512 x 512 massive MIMO in an innovative method to enhance OP performance rate and mitigate the power location coefficient's effect for remote users. The results were obtained from Rayleigh fading channels using the MATLAB simulation software program. According to the outcomes, increasing the power location coefficients for the far user from 0.6 to 0.8 reduces the OP rate because increasing the power location coefficient for the far user decreases the power location coefficient for the near user, which results in less interference between them. In terms of the OP performance rate, the DL cooperative NOMA outperforms the NOMA. According to the findings, the DL cooperative NOMA OP rate outperforms the DL NOMA by a rate of 10(-0.5). Whereas the 16 x 16 MIMO enhances the OP for the far user by 78.0 x 10(-4), the 32 x 32 MIMO increases the OP for the far user by 19.0 x 10(-4), and the 64 x 64 MIMO decreases the OP rate for the far user by 5.0 x 10(-5). At a SNR of 10 dB, the 128 x 128 massive MIMO improves the OP for the far user by 1.0 x 10(-5). The 256 x 256 massive MIMO decreases the OP for the far user by 43.0 x 10(-5), and the 512 x 512 massive MIMO enhances the OP for the far user by 8.0 x 10(-6). The MIMO techniques improve the OP performance, while the massive MIMO technology enhances the OP performance dramatically.