Results 61 to 70 of about 1,022 (162)
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
doaj +2 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
Quantum Search-Aided Multi-User Detection for Sparse Code Multiple Access
IEEE Access, 2019 With the explosive proliferation of mobile devices, the scarcity of communication resources has emerged as a critical issue in the next generation (NG) communication systems.
Wenjing Ye +4 more
doaj +1 more source
Low-Density Code-Domain NOMA: Better Be Regular
, 2017 A closed-form analytical expression is derived for the limiting empirical squared singular value density of a spreading (signature) matrix corresponding to sparse low-density code-domain (LDCD) non-orthogonal multiple-access (NOMA) with regular random ...
Shamai, Shlomo +2 more
core +1 more source
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
doaj
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
doaj +1 more source
MIMO Hybrid PD-SCMA NOMA Uplink Transceiver System
IEEE Access, 2022 The application of multiple-input multiple-output (MIMO) on power domain sparse code multiple access (PD-SCMA) systems would enhance their performance by increasing the multiplexing and diversity gains.
Simon Chege, Tom Walingo
doaj +1 more source
A Universal Receiver for Uplink NOMA Systems
, 2018 Given its capability in efficient radio resource sharing, non-orthogonal multiple access (NOMA) has been identified as a promising technology in 5G to improve the system capacity, user connectivity, and scheduling latency.
Chen, Yan +3 more
core +1 more source
Pattern Division Multiple Access with Large-scale Antenna Array
, 2017 In this paper, pattern division multiple access with large-scale antenna array (LSA-PDMA) is proposed as a novel non-orthogonal multiple access (NOMA) scheme.
Jiang, Yanxiang +4 more
core +1 more source
SCMA for Open-Loop Joint Transmission CoMP
, 2015 Sparse Code Multiple Access (SCMA), a non-orthogonal multiple access scheme, has been introduced as a key 5G technology to improve spectral efficiency. In this work, we propose SCMA to enable open-loop coordinated multipoint (CoMP) joint transmission (JT)
Bayesteh, Alireza +3 more
core +1 more source