Results 191 to 200 of about 7,220 (258)

Enabling SCMA long codewords with a parallel SCMA coding scheme

2015 International Conference on Wireless Communications & Signal Processing (WCSP), 2015
Fifth generation (5G) wireless networks require massive connectivity with a large number of devices and ask for non-orthogonal multiple access which has been proposed as a paradigm shift of physical layer technologies. Among all the existing non-orthogonal technologies where the number of users can be larger than the spreading factor, recently proposed
Yuxi Han, Sihai Zhang, Wuyang Zhou, Qing Ling   +3 more
openaire   +1 more source

Dynamically changing SCMA codebooks

2017 International Siberian Conference on Control and Communications (SIBCON), 2017
Sparse code multiple access is a new method for non-orthogonal multiplexing proposed in the framework of the 5G concept development. Noise immunity of this method depends directly on the codebooks. The article reviews the method of forming dynamically changing complex numbers of SCMA codebooks depending on the signal noise ratio. The method is based on
D. A. Pokamestov, A. Ya. Demidov, Ya. V. Kryukov, E. V. Rogozhnikov   +3 more
openaire   +1 more source

SCMA Decoding via Deep Learning

IEEE Wireless Communications Letters, 2021
Sparse code multiple access (SCMA) has become a highly competitive technology for future cellular systems. For the receiver of the SCMA system, besides the traditional maximum likelihood and message passing algorithm solutions, a deep neural network (DNN) method that causes whirlwinds in image recognition can reduce the computational complexity of the ...
Chia-Po Wei, Han Yang, Chih-Peng Li, Yen-Ming Chen   +3 more
openaire   +1 more source

Deep Learning-Aided SCMA

IEEE Communications Letters, 2018
Sparse code multiple access (SCMA) is a promising code-based non-orthogonal multiple-access technique that can provide improved spectral efficiency and massive connectivity meeting the requirements of 5G wireless communication systems. We propose a deep learning-aided SCMA (D-SCMA) in which the codebook that minimizes the bit error rate (BER) is ...
Minhoe Kim, Nam-I Kim, Woongsup Lee, Dong-Ho Cho   +3 more
openaire   +1 more source

Joint Beamforming and Resource Allocation for STAR-IRS-Aided SCMA ISAC Systems Using Meta Deep Reinforcement Learning

IEEE Transactions on Wireless Communications
In response to growing demands for both sensing and communication performance from future applications of wireless networks, simultaneous transmitting and reflecting intelligent reflecting surface (STAR-IRS), sparse code multiple access (SCMA), and ...
Armin Farhadi, Ali Olfat, Christos Masouros   +2 more
semanticscholar   +1 more source

Near-Global-Optimal Resource Allocation for Uplink SCMA Systems Based on Whale Optimization Algorithm

IEEE Transactions on Wireless Communications
This paper investigates a joint resource allocation (RA) algorithm to maximize the average sum rate (ASR) of the sparse code multiple access (SCMA) random model-based networks.
Meysam Soltanpour, Haixia Zhang
semanticscholar   +1 more source

Adapting SCMA Codebooks to Channel State

2021 3rd International Youth Conference on Radio Electronics, Electrical and Power Engineering (REEPE), 2021
Non-orthogonal multiple access (NOMA) methods are a promising technology for organizing the physical layer of next generation communication networks. Sparse code multiple access (SCMA) is one of the most efficient NOMA implementations. The SCMA method is based on the use of codebooks – sets of sparse signals.
Dmitriy A. Pokamestov, Yakov V. Kryukov, Eugeniy V. Rogozhnikov, Islam Kanatbekuli   +3 more
openaire   +1 more source

Synchronous and Asynchronous HARQ-CC Assisted SCMA Schemes

IEEE Signal Processing Letters
This letter proposes a novel hybrid automatic repeat request with chase combining assisted sparse code multiple access (HARQ-CC-SCMA) scheme. Depending on whether the same superimposed packet is retransmitted, synchronous and asynchronous modes are ...
Man Wang, Zheng Shi, Yunfei Li, Xianda Wu, Weiqiang Tan   +4 more
semanticscholar   +1 more source

A Lightweight Stepwise SCMA Codebook Design Scheme for AWGN Channels

Forests
Forests play a critical role in maintaining global ecological balance, regulating climate, and supporting biodiversity. Effective forest management and monitoring relies on the deployment of large-scale wireless sensor networks (WSNs) for real-time data ...
Min Hua, Shuo Meng, Yue Juan, Borui Bian, Xiaoming Liu   +4 more
semanticscholar   +1 more source

Single Carrier SCMA Detection Schemes for Frequency Selective Channels

IEEE Transactions on Wireless Communications
Sparse code multiple access (SCMA) is a candidate technology for future wireless communication systems to enhance network access capacity. Existing multi-carrier techniques, such as orthogonal frequency division multiplexing (OFDM) that are based on SCMA
Tianzhu Qin, Ziyi Yang, Jia'ao Liang, Kaining Han, Jianhao Hu   +4 more
semanticscholar   +1 more source