Results 21 to 30 of about 30,188 (287)
SCMA CODEBOOK DESIGN BASED ON GRADIENT ASCENT ALGORITHM [PDF]
Proceedings on Engineering Sciences, 2022 Sparse Code Multiple Access (SCMA) is a non-orthogonal multiple access scheme, which improves spectrum efficiency. SCMA codebooks determine the bit error rate (BER) performance.
Islam Kanatbekuli +4 more
doaj +1 more source
Spatial Modulated Multicarrier Sparse Code-Division Multiple Access [PDF]
IEEE Transactions on Wireless Communications, 2020 This paper proposes a novel spatial-modulated multicarrier sparse code-division multiple access (SM/MC-SCDMA) system for achieving massive connectivity in device-centric wireless communications. In our SM/MC-SCDMA system, the advantages of both MC signalling and SM are amalgamated to conceive a low-complexity transceiver.
Yusha Liu +4 more
openaire +4 more sources
Reconfigurable Intelligent Surface Optimization for Uplink Sparse Code Multiple Access [PDF]
IEEE Communications Letters, 2022 The reconfigurable intelligent surface (RIS)-assisted sparse code multiple access (RIS-SCMA) is an attractive scheme for future wireless networks. In this letter, for the first time, the RIS phase shifts of the uplink RIS-SCMA system are optimized based on the alternate optimization (AO) technique to improve the received signal-to-noise ratio (SNR) for
Ibrahim Al-Nahhal +4 more
openaire +5 more sources
Spatial Modulation Aided Sparse Code-Division Multiple Access [PDF]
IEEE Transactions on Wireless Communications, 2018 In order to support high-user-load multiple-access (MA), we propose a non-orthogonal MA scheme based on a beneficial amalgam of spatial modulation (SM) and sparse code-division multiple-access (SCDMA), which is termed the SM-SCDMA. Hence, SM-SCDMA inherits both the merits of SM with single radio-frequency MIMO transceiver implementation and the ...
Yusha Liu, Lie-Liang Yang, Lajos Hanzo
openaire +3 more sources
Space-Time Coded Generalized Spatial Modulation for Sparse Code Division Multiple Access [PDF]
IEEE Transactions on Wireless Communications, 2021 Space-time coded generalized spatial modulation-aided sparse code division multiple access (STC/GSM-SCDMA) is proposed, which exploits the two-dimensional transmit diversity potential of both the spatial and of the frequency domain. Hence, it constitutes a promising solution for the pervasive connectivity of devices in next-generation nonorthogonal ...
Yusha Liu +3 more
openaire +2 more sources
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
Delayed Bit Interleaved Coded Sparse Code Multiple Access
IEEE Transactions on Vehicular Technology, 2020 Targeting to provide reliable short-packet communications with tens of bits in machine-type networks, we investigate a novel sparse code multiple access (SCMA) scheme called delayed bit-interleaved coded SCMA (DBIC-SCMA). At the transmitter side, a delay module is introduced between each channel encoder and SCMA mapper such that data bits from ...
Zeina Mheich +3 more
openaire +4 more sources
Optimization of multiple access mode for large-scale constellation networking communication
Xibei Gongye Daxue Xuebao, 2023 In the large-scale satellite constellation technology, the establishment of satellite internal network is the top priority. As the network capacity of the constellation continues to expand and the number of satellite nodes continues to increase, the ...
GUO Xiaoxu +4 more
doaj +1 more source
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‐complexity sphere decoding for MIMO‐SCMA systems
IET Communications, 2021 Multiple‐input multiple‐output‐sparse code multiple access, a non‐trivial integration of sparse code multiple access and multiple‐input multiple‐output techniques, is able to achieve high spectrum efficiency and massive user connections.
Zhipeng Pan +4 more
doaj +1 more source