Results 31 to 40 of about 198 (123)
Channel Estimation in Uplink SCMA System
Известия высших учебных заведений России: Радиоэлектроника, 2016 The effect of channel estimation error on bit error probability of uncoded and coded sparse code multiple access (SCMA) system in uplink channel with block fading is considered.
A. B. Sergienko, V. P. Klimentjev
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Enabling High Order SCMA Systems in Downlink Scenarios With a Serial Coding Scheme
IEEE Access, 2018 In the future fifth generation communication systems, sparse code multiple access (SCMA) shows strong competitiveness as a novel non-orthogonal multiple access (NOMA) technique. Attributing to multi-dimensional codebooks, the SCMA can obtain shaping gain
Yuxi Han +3 more
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Impact of overload factor on uplink SCMA system
Dianxin kexue, 2018 Sparse code multiple access (SCMA) is regarded as a promising multiple access technology for 5G because of its excellent performance.One of the major challenges that 5G networks are facing is the massive connectivity in terms of both data volume and the ...
Hongyang ZHANG +3 more
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Grant-Free Rateless SCMA for Cellular Internet of Things Networks
IEEE Access, 2019 For supporting the massive connectivities and better adapting the high dynamical channel states of the cellular Internet of things networks, in this paper we proposed a new grant-free rateless sparse code multiple access (RSCMA) protocol. In the proposed
Zhipeng Pan +4 more
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PhotonicsThe capacity performance of visible light communication (VLC) systems can be improved by using sparse code multiple access (SCMA). Since SCMA is a codebook-based multiple access scheme, the design of the codebook is crucial.
Jingxuan Dong +3 more
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Toward High-Performance Implementation of 5G SCMA Algorithms
IEEE Access, 2019 The recent evolution of mobile communication systems toward a 5G network is associated with the search for new types of non-orthogonal modulations such as sparse code multiple access (SCMA).
Alireza Ghaffari +4 more
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Sparse code multiple access on the generalized frequency division multiplexing
EURASIP Journal on Wireless Communications and Networking, 2020 Recent advances in the communication systems culminated in a new class of multiple access schemes, named non-orthogonal multiple access (NOMA), where the main goal is to increase the spectrum efficiency by overlapping data from different users in a ...
Guilherme P. Aquino, Luciano L. Mendes
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Optimized SCMA Codebook Design by QAM Constellation Segmentation With Maximized MED
IEEE Access, 2018 An optimized design of a sparse code multiple access (SCMA) codebook for uplink wireless communications is presented by dividing an optimized 16-point round quadrature amplitude modulation (QAM) into several subsets.
Shunlan Liu +3 more
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Investigation on Evolving Single-Carrier NOMA Into Multi-Carrier NOMA in 5G
IEEE Access, 2018 Non-orthogonal multiple access (NOMA) is one promising technology, which provides high system capacity, low latency, and massive connectivity, to address several challenges in the fifth-generation wireless systems. In this paper, we first reveal that the
Jie Zeng +6 more
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Biological Resource Allocation Algorithms for Heterogeneous Uplink PD-SCMA NOMA Networks
IEEE Access, 2020 Due to their ability to multiplex users on a resource element (RE), Non-orthogonal multiple access (NOMA) techniques have gained popularity in 5G network implementation.
Thabelang Sefako, Tom Walingo
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