Results 71 to 80 of about 1,022 (162)

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, Jing Lei, Wei Liu, Junshan Luo, Chaojing Tang   +4 more
doaj   +1 more source

Novel Sparse-Coded Ambient Backscatter Communication for Massive IoT Connectivity

, 2018
Low-power ambient backscatter communication (AmBC) relying on radio-frequency (RF) energy harvesting is an energy-efficient solution for batteryless Internet of things (IoT).
Kim, Dong In, Kim, Tae Yeong
core   +1 more source

A Superimposed Codebook Design for Downlink Sparse Code Multiple Access Visible Light Communication System

Photonics
The 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, Zixiong Wang, Jinlong Yu, Yang Jiang   +3 more
doaj   +1 more source

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, Mathieu Leonardon, Adrien Cassagne, Camille Leroux, Yvon Savaria   +4 more
doaj   +1 more source

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
doaj   +1 more source

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, Jing Wang, Jianrong Bao, Chao Liu   +3 more
doaj   +1 more source

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
doaj   +1 more source

Joint Domain Based Massive Access for Small Packets Traffic of Uplink Wireless Channel

, 2017
The fifth generation (5G) communication scenarios such as the cellular network and the emerging machine type communications will produce massive small packets.
Song, Qiang, Wei, Guo, Xie, Ronggui, Yin, Huarui   +3 more
core   +1 more source

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, Tiejun Lv, Ren Ping Liu, Xin Su, Mingyao Peng, Chang Wang, Jiajia Mei   +6 more
doaj   +1 more source

Dynamic interference for uplink SCMA in large-scale wireless networks without coordination

EURASIP Journal on Wireless Communications and Networking, 2018
Fast varying active transmitter sets are a key feature of wireless communication networks with very short length transmissions arising in communications for the Internet of Things.
Malcolm Egan, Laurent Clavier, Ce Zheng, Mauro de Freitas, Jean-Marie Gorce   +4 more
doaj   +1 more source