In a device-to-device communication scenario, the number of far users (FUs) is higher than near (NUs) in each cluster. such paired NUs and FUs communicate through non-orthogonal multiple access (NOMA), remaining orthogonal accesses (OMA) schemes. This system called as hybrid-NOMA (HNOMA). letter proposes reconfigurable intelligent surface (RIS)-assisted HNOMA to enhance energy spectral efficiencies conventional HNOMA. this proposed RIS-assisted (PR-HNOMA) system, NU with allocations...

Terahertz (THz) band communication is a promising technology for the 6G wireless networks. However, due to very high spread attenuation and molecular absorption, THz frequencies provide limited coverage area need novel solutions overcome these constraints. Further, intelligent reflecting surfaces (IRS) introduced enhance by reconfiguring propagation environment. Therefore, in this paper, an IRS-assisted system designed analyzed referred as IRS-TH system. The proposed significantly improves...

In this letter, a precoded spatial modulation-aided cooperative nonorthogonal multiple access (NOMA), referred to as PC-NOMA, has been proposed for multiple-input and multiple-output (MIMO) downlink scenario. PC-NOMA scheme, the base station (BS) broadcasts three users' information over two time slots: in first slot, near users receive data through direct links second third user (far) receives indirectly from users. The links' signal superposed with indirect link's broadcast phase at BS....

The main characteristic of the next-generation wire-less communications are seamless connectivity, large bandwidth, and high spectral energy efficiencies. To acheive these objectives, reconfigurable intelligent surface (RIS), terahertz (THz) communication, user pairing nonorthogonal multiple access (NOMA) have been recognized as key enabling technologies. In this paper, we propose a RIS-assisted THz-NOMA system, which is referred to RTHz-NOMA. performed based on distance between users power...

In terahertz (THz) communication, the integration of reconfigurable intelligent surface (RIS), cooperative non-orthogonal multiple access (CNOMA), and multiple-input multiple-output (MIMO) techniques holds promise for next-gen wireless networks, enhancing spectral efficiency overall system access. However, traditional MIMO-NOMA faces power consumption implementation challenges. this paper, we propose a novel RIS-assisted spatial modulation (SM)-CNOMA THz termed RSM-CNOMA. RSM-CNOMA, base...

Spatial modulation uses index (IM)-based transmission scheme to reduce transmitted power and radio-frequency (RF) chains in multiple antenna systems. In this paper, we propose IM non-orthogonal access (NOMA) based IM-NOMA system (I-NOMA) support massive connectivity a wireless network. the proposed downlink I-NOMA, users are multiplexed using both transmit different levels at base station. The symbol error rate (SER) sum performances of I-NOMA analyzed compared with IMbased orthogonal (OMA)...

Abstract Nonorthogonal multiple access (NOMA) and reconfigurable intelligent surface (RIS) methods are explored to enhance spectral energy efficiency of a wireless network. In this article, we have proposed downlink RIS‐assisted index modulation NOMA for next‐generation systems, it is referred as R‐INOMA. the R‐INOMA system, base station transmits information through RIS three users, first user assigned in spatial domain remaining two users multiplexed using power NOMA. We provide an...

Reconfigurable intelligent surfaces (RIS) and non-orthogonal multiple access (NOMA) are promising technologies for next-generation wireless networks. RIS can reconfigure wire-less channels through passive reflecting elements, NOMA enhances spectral efficiency (SE) connectivity. In this paper, a base station (BS) transmits superimposed precoded symbols to near far users via two different deployment strategies. Initially, single is deployed at the BS consists of N referred as centralized...

Summary Paper has considered multiple reconfigurable intelligent surfaces (RISs) assisted downlink non‐orthogonal accesses (NOMA) system, referred to as MR‐NOMA. Multiple RISs create a line‐of‐sight (LOS) channel between BS and users improve network coverage, especially in high frequencies severe path attenuation scenarios. In MR‐NOMA, all are series activated simultaneously; therefore, multiplicative beamforming gain from the inter‐RIS channels is achieved. Bit error probability (BEP) under...

Terahertz (THz) band communication and reconfigurable intelligent surface (RIS) have emerged as promising technologies for next-generation wireless networks. In this paper, RIS-assisted THz system using spatial modulation (SM) transmission method is analyzed, it referred to SM (RSMT) system. The proposed RSMT achieves higher energy spectral efficiencies due RIS techniques. Further, imperfections of devices such in-phase/quadrature imbalance nonlinearity considered hybrid distortions,...