Results 21 to 30 of about 255,246 (314)
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
CG-SCMA Codebook Design Based on Maximized Euclidian Distance
Journal of Telecommunications and Information Technology, 2023 Sparse code multiple access (SCMA) is a multi-dimensional codebook based on a class of non-orthogonal multiple access (NOMA) technologies enabling the delivery of non-orthogonal resource elements to numerous users in 5G wireless communications without ...
Sura S. Mohamed, Hikmat N. Abdullah
doaj +1 more source
Composite CDMA - A statistical mechanics analysis [PDF]
, 2009 Code Division Multiple Access (CDMA) in which the spreading code assignment to users contains a random element has recently become a cornerstone of CDMA research.
David Saad +12 more
core +3 more sources
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