Results 231 to 240 of about 7,220 (258)

Performance Study of SCMA Codebook Design

2017 IEEE Wireless Communications and Networking Conference (WCNC), 2017
Sparse code multiple access (SCMA) is a non- orthogonal codebook (CB) based multiple access scheme, proposed to cope with the heterogeneous and challenging performance requirements for mission critical communication and massive machine-type communication (MTC) in the fifth Generation (5G) wireless system. In this paper, the performance of SCMA has been
Mehmood Alam, Qi Zhang
openaire   +1 more source

Design of Uplink SCMA Codebooks Using Evolution Strategies

IEEE Communications Letters
Sparse Code Multiple Access (SCMA) is a promising non-orthogonal multiple access (NOMA) technique in future wireless communications. In this letter, a novel uplink codebook optimization method for SCMA using evolution strategies is proposed.
Junxiang Yang, Yuan Zeng, Wei Wan, Xi Ye
semanticscholar   +1 more source

Low Complexity Message Passing Receiver Design for SCMA-GFDM System

IEEE Transactions on Vehicular Technology
Sparse code multiple access (SCMA) and generalized frequency-division multiplexing (GFDM) are two promising techniques that can effectively handle massive connectivity and enhance spectrum efficiency in the sixth generation wireless communication systems.
Hao Cheng, Min Zhang, Chuan Zhang, Haiyang Zhang, Yongming Huang, Baoyun Wang   +5 more
semanticscholar   +1 more source

An SCMA-Based Grant-Free Access Scheme

IEEE Wireless Communications and Networking Conference
This paper elaborates on the idea of building grant-free channel access schemes from non-orthogonal multiple access ones, and proposes an explicit such scheme based on sparse code multiple access (SCMA).
Alessandro Mirri, Diego Forlivesi, Lorenzo Valentini, Marco Chiani, Enrico Paolini   +4 more
semanticscholar   +1 more source

An Anti-Jamming SCMA Method Using Turbo-Hadamard Codes for Satellite Communications

2024 International Conference on the Frontiers of Electronic, Electrical and Information Engineering (ICFEEIE)
Given the demand for ubiquitous connectivity and massive service access in future wireless communications, the application of sparse code multiple access (SCMA) to satellite communications has great potential.
Wenzhen Li, Zhong Zheng, Shan Luan, Gaofeng Pan   +3 more
semanticscholar   +1 more source

High Security and Low Complexity SCMA-OFDM Transmission System Based on Dual Three-Dimensional Memory Hyperchaotic in Seven-Core Optical Fibers

Journal of Lightwave Technology
This paper proposes a physical layer encryption scheme with high security and low complexity for sparse code multiple access (SCMA) in weakly coupled seven-core optical fibers, using orthogonal frequency division multiplexing (OFDM) modulation to improve
Ze-Ping Guo, Bo Liu, Jianxin Ren, Y. Mao, Xiangyu Wu, Shuaidong Chen, Rahat Ullah, Yongfeng Wu, Ying Li, Shuyu Zhou, Mengjie Wu, Zhongwen Ding, Jie Cui, Juntao Zhang   +13 more
semanticscholar   +1 more source

An Overview of “SCMA II”

1997
The goals of this conference (and those of “SCMA I”) [FB1992] were three fold. i) To expose statisticians to the statistical challenges posed by the explosive growth in the amount and complexity of astronomical data and in astrophysical theory and experimentation during the second half of this century.
openaire   +1 more source

Random Codebook-Based 3D-SCMA-OFDM High-Security Optical Communication

Journal of Lightwave Technology
In this article, a three-dimensional sparse code division multiple access (SCMA) orthogonal frequency division multiplexing (OFDM) passive optical network (PON) high-security optical transmission system based on a random codebook is proposed.
Yi Lu, Bo Liu, Jianxin Ren, Y. Mao, Xiangyu Wu, Shuaidong Chen, Rahat Ullah, Yongfeng Wu, Ying Li   +8 more
semanticscholar   +1 more source

Receiver Designs for SC-SCMA Systems Over Frequency Selective Channels

IEEE Vehicular Technology Conference
Sparse code multiple access (SCMA) is a candidate technology for further wireless communication system to enhance the multiple access capacity. The existing multi carriers technique based SCMA schemes, such as orthogonal frequency division multiplexing ...
Tianzhu Qin, Ziyi Yang, Jia'ao Liang, Kaining Han, Jianhao Hu   +4 more
semanticscholar   +1 more source

On the Average Sum-Rate of the 3D Single-Cell SCMA Systems

IEEE Communications Letters
Two-dimensional (2D) models for performance analysis of wireless networks are inappropriate for high-rise buildings and city central business districts, particularly when massive connectivity is required.
Maryam Cheraghy, Meysam Soltanpour
semanticscholar   +1 more source