###### Abstract  
Non-orthogonal multiple access (NOMA) has emerged as a key enabling technology in the realm of millimeter-wave (mmWave) massive MIMO (mMIMO) systems for enhancing spectral efficiency (SE). Furthermore, it is believed that simultaneous wireless information and power transmission (SWIPT) will allow for the system's energy efficiency (EE) to be maximised. The effectiveness of the mmWave mMIMO-NOMA system along with SWIPT has been examined in this article under multi-user (MU) scenarios. This paper's major goal is to construct a low-complexity hybrid-precoder (HP) while taking into account the sub-connected (SC) architecture. The linear precoder is a computationally demanding technique as a result of the matrix inversion. The authors of this paper have suggested a symmetric sequential over-relaxation (SSOR) complex regularised zero-forcing (CRZF) linear precoder. The power distribution for the mmWave mMIMO-NOMA system and power splitting factors for SWIPT are jointly tuned to maximize the sum rate along with the suggested SSOR-CRZF precoder. In regards to complexity, SE, and EE, the SSOR-CRZF-HP surpasses conventional linear precoders. m 2024 5 823-845. 18 August 2024 18 August 20  
networks [6; 7; 8]. Although SWIPT significantly improves battery life and EE, its practical application is severely constrained by the ineffectiveness of the wireless transmission of power caused by scattering as well as attenuation in route loss. Integrating SWIPT with massive multiple-input multiple-out (mMIMO) technology serves as a technically doable way to get around these restrictions, and it enables SWIPT to reach its full potential [9; 10; 11]. The combination of NOMA and SWIPT has garnered significant interest lately. Successive interference cancellation (SIC) demonstrates a sizeable gain for SWIPT systems when taking into account a bipolar ad hoc network [12]. The author in [13] introduces a mmWave mMIMO-NOMA SWIPT system with hybrid precoding, user grouping, power splitting (PS), and power allocation (PA) for enhancing the SE as well as the EE. The authors in [14] propose a novel cooperative SWIPT-NOMA transmission method to assist cell-edge users. The authors in [4] introduce an alternating optimization (AO) algorithm to decouple the joint PA and PS nonconvex optimization problem for enhancing the SE as well as the EE. In [15], the performance of cooperative MIMO-NOMA networks is examined by incorporating broadcast antenna selection and SWIPT protocols. The authors in [16] propose a low-complexity optimisation technique linked to PS control and timeslot allocation in order to maximise the weighted sum throughput for each downlink (DL) as well as uplink (UL) for MIMO-NOMA systems, along with SWIPT. In an effort to improve the SE and EE, the authors in [17] introduce a novel affinity propagating clustering technique to support the grouping of users and a Lagrangian duality approach to decouple the joint PA as well as transmitting power. The authors in [18] have enhanced the NOMA-SWIPT system by simultaneously designing the transmit beamforming and PS coefficients to seek high EE for information transmission. HPs have undergone a great deal of effort in their design. The maximum ratio transmission (MRT) system has been thoroughly explored, in addition to zero-forcing (ZF), regularised ZF (RZF) [19], and minimum mean square error (MMSE) [20]. There have been numerous proposals over the years for designing effective HPs, including the Kalman filter-reliant strategy [21; 22], block diagonalization mechanism [23], modified block diagonalization mechanism [24], and the singular-value-decomposition (SVD) reliant strategy [25], as well as the lattice reduction (LR) reliant strategy [26; 27; 28; 29]. The authors of [30] have presented an outline enabling LR-assisted precoding via vector perturbation (VP) to improve the performance of mMIMO systems.