Results 31 to 40 of about 51,024 (274)
Sparse code multiple access codebooks optimization [PDF]
, 2022 Fen Bilimleri Enstitüsü, Elektrik-Elektronik Mühendisliği Ana Bilim DalıSon yıllarda çok kullanıcılı iletişim kurma talebi günümüzün vazgeçilmez ihtiyaçlarından birisi haline gelmiştir.
Tezekici, Mürüvvet Aybüke
core
HARQ scheme for sparse code multiple access based on network coding
Tongxin xuebao, 2022 To fulfill the stringent reliability and throughput demand of the beyond-5G and the forthcoming 6G, a novel network coding (NC) based hybrid automatic retransmission request (HARQ) for low-density parity check (LDPC) coded SCMA was proposed.Two ...
Ke LAI, Jing LEI, Wei LIU, Lei WEN
doaj +2 more sources
Reconfigurable Intelligent Surface Optimization for Uplink Sparse Code Multiple Access [PDF]
IEEE Communications Letters, 2022 The reconfigurable intelligent surface (RIS)-assisted sparse code multiple access (RIS-SCMA) is an attractive scheme for future wireless networks. In this letter, for the first time, the RIS phase shifts of the uplink RIS-SCMA system are optimized based on the alternate optimization (AO) technique to improve the received signal-to-noise ratio (SNR) for
Ibrahim Al-Nahhal +4 more
openaire +4 more sources
Grant-Free Uplink Transmission With Multi-Codebook-Based Sparse Code Multiple Access (MC-SCMA)
IEEE Access, 2019 In sparse code multiple access (SCMA)-based grant-free (GF) access, both user's channel and the selected SCMA codebook (CB) are considered as a transmission signature for multi-user detection (MUD). In conventional SCMA-based grant-free (GF) access where
Ameha Tsegaye Abebe, Chung G. Kang
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Low-Complexity Codebook Design for SCMA-Based Visible Light Communication
IEEE Open Journal of the Communications Society, 2022 Sparse code multiple access (SCMA), as a code-domain non-orthogonal multiple access (NOMA) scheme, has received considerable research attention for enabling massive connectivity in future wireless communication systems.
Saumya Chaturvedi +4 more
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Deep-Unfolded Sparse CDMA: Multiuser Detector and Sparse Signature Design
IEEE Access, 2021 Sparse code division multiple access (SCDMA) is a promising non-orthogonal multiple access technique for future wireless communications. In SCDMA, transmitted symbols from multiple users are coded by their own sparse signature sequences, and a base ...
Satoshi Takabe +2 more
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Wavelet-Transform-Based Sparse Code Multiple Access for Power Line Communication
, 2022 This paper presents Discrete Wavelet Transformed Sparse Code Multiple Access (DWT-SCMA) in Power Line Communication (PLC) systems. In the present internet of things era, PLC provides an established infrastructure for low-cost and reliable indoor ...
Kaamran Raahemifar +4 more
core +1 more source
Interleaving based SCMA Codebook Design Using Arnold’s Cat Chaotic Map
Iraqi Journal of Information & Communication Technology, 2023 Non-orthogonal multiple access (NOMA) technology is a significant topic of the present 5G investigation. A possible NOMA approach is Sparse Code Multiple Access (SCMA), increasing next-generation communication's ability to handle multiple users. In SCMA,
Sura S. Mohamed, Hikmat N. Abdullah
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Channel code division multiple access and its multilevel structured LDPC based instantiation
, 2008 In this paper, we introduce and outline the concept of Channel Code Division Multiple Access (CCDMA) using a design example based on the recently proposed Multilevel Structured (MLS) LDPC codes. We succeeded in making the memory requirements of the multi-
Sheng Chen +9 more
core +1 more source
Multiple Access With Polarity Division Sparse Code for Visible Light Communication
IEEE Photonics Journal, 2019 The increasing demand of mobile internet and Internet of Things poses challenging requirements for indoor wireless communication. Visible light communication (VLC) is a promising technology to alleviate the growing traffic problem. In addition, nonlinear
Yu Xiao, Zhitong Huang, Yuefeng Ji
doaj +1 more source