Results 41 to 50 of about 7,220 (258)
Multi Site Coordination using a Multi-Agent System [PDF]
, 2007 A new approach of coordination of decisions in a multi site system is proposed. It is based this approach on a multi-agent concept and on the principle of distributed network of enterprises.
Anciaux, Didier +2 more
core +4 more sources
Transceiver design and performance analysis for uplink SCMA based on CP-free OFDM
Dianxin kexue, 2021 A typical sparse code multiple access (SCMA) system utilizes orthogonal frequency division multiplexing (OFDM) technology with cyclic prefix (CP) to combat multipath fading in wireless channels.Therefore, its capacity is reduced by the CP-insertion.To ...
Li ZHOU, Xiqing LIU
doaj +2 more sources
A Tutorial on Decoding Techniques of Sparse Code Multiple Access
IEEE Access, 2022 Sparse Code Multiple Access (SCMA) is a disruptive code-domain non-orthogonal multiple access (NOMA) scheme to enable future massive machine-type communication networks.
Saumya Chaturvedi +4 more
doaj +1 more source
Iterative detection and decoding for SCMA systems with LDPC codes
, 2015 Sparse code multiple access (SCMA) is a promising multiplexing approach to achieve high system capacity. In this paper, we develop a novel iterative detection and decoding scheme for SCMA systems combined with Low-density Parity-check (LDPC) decoding. In
Chen, Zhiyong +5 more
core +1 more source
SCMA Codebook Design Based on Divided Extended Mother Codebook
IEEE Access, 2021 Sparse code multiple access (SCMA) is one of the competitive non-orthogonal multiple access (NOMA) techniques for the next generation communication systems.
Zhaoyang Hou +3 more
doaj +1 more source
Channel estimation and performance analysis for uplink SCMA system
Dianxin kexue, 2017 There are two types of physical mapping for SCMA named RE-Sparse SCMA and RB-Sparse SCMA.A frequency division multiplexing (FDM) based pilot pattern was proposed for RE-Sparse SCMA,and existing code division multiplexing pilot patterns based on cyclic ...
Xian’an HU, Xiangnian ZENG
doaj +2 more sources
Experimental demonstration of SCMA for visible light communications [PDF]
, 2018 We propose an experimental demonstration of sparse code multiple access (SCMA) based visible light communications (VLC) system, in which the multi-dimensional codewords selected from a predefined codebook set are used to encode the transmitted data and a
Ghassemlooy, Zabih +4 more
core +1 more source
Unequal Error Protection SCMA Codebooks
IEEE Transactions on Vehicular Technology, 2019 This paper investigates the design of unequal error protection (UEP) codebooks for sparse code multiple access (SCMA) systems. We propose a joint low-density parity check (LDPC) code and SCMA codebook design approach by incorporating cloud partitioning of codewords in the design of SCMA codebooks with different protection levels.
Zeina Mheich +3 more
openaire +4 more sources
IEEE Photonics Journal, 2022 Sparse code multiple access (SCMA) is a promising technology to provide high throughput and overall improved system performance at affordable cost for next-generation passive optical networks (NG-PONs).
Hui Yang +4 more
doaj +1 more source
Impact of factor graph on average sum rate for uplink sparse code multiple access systems [PDF]
, 2016 In this paper, we first study the average sum rate of sparse code multiple access (SCMA) systems, where a general scenario is considered under the assumption that the distances between the mobile users and the base station are not necessarily identical ...
Chen, Dageng +5 more
core +1 more source