Non-orthogonal Multiple Access (NOMA) has been envisioned as one of the key enabling techniques to fulfill requirements future wireless networks. The primary benefit NOMA is higher spectrum efficiency compared Orthogonal (OMA). This paper presents an error rate comparison two distinct schemes, i.e., power domain (PD-NOMA) and Sparse Code (SCMA). In a typical PD-NOMA system, successive interfere...

This paper studies a downlink system that combines orthogonal-time-frequency-space (OTFS) modulation and sparse code multiple access (SCMA) to support massive connectivity in high-mobility environments. We propose cross-domain receiver for the considered OTFS-SCMA which efficiently carries out OTFS symbol estimation SCMA decoding joint manner. is done by iteratively passing extrinsic informatio...

<span lang="EN-GB">The progressions in telecommunication beyond the 5<sup>th</sup> generation have created a need to improve research drifts. The current 5G study has an important focus on non-orthogonal multiple access (NOMA) technology. sparse code (SCMA) is promising technique within NOMA, enhancing multi-user handling capability of next-generation communication. In SCMA sp...

Sparse code multiple access (SCMA) is a new multiple access technique which supports massive connectivity. Compared with the current Long Term Evolution (LTE) system, it enables the overloading of active users on limited orthogonal resources and thus meets the requirement of the fifth generation (5G) wireless networks. However, the computation complexity of existing detection algorithms increas...

the wiener index w(g) of a connected graph g is defined as the sum of the distances betweenall unordered pairs of vertices of g. the eccentricity of a vertex v in g is the distance to avertex farthest from v. in this paper we obtain the wiener index of a graph in terms ofeccentricities. further we extend these results to the self-centered graphs.

Sparse Code Multiple Access (SCMA) is capable of ameliorating the performance wireless communication systems for massive connectivity. The sparsity codeword allows SCMA to employ message-passing algorithm (MPA) at receiver address connection overload. detection complexity traditional MPA, on other hand, exponentially exploding with increasing number connected devices. In this paper, a low-compl...

As 5G networks are being rolled out in many different countries nowadays, the time has come to investigate how upgrade and expand them toward 6G, where latter is expected realize interconnection of everything as well development a ubiquitous intelligent mobile world for life. To enable this epic leap communications, article provides an overview outlook on application sparse code multiple access...