Zobrazeno 1 - 10
of 595
pro vyhledávání: '"sparse code multiple access"'
Publikováno v:
Jurnal Nasional Teknik Elektro dan Teknologi Informasi, Vol 13, Iss 2, Pp 124-130 (2024)
Sparse code multiple access (SCMA) dapat mendukung sistem saat terjadi overloading di sisi penerima sehingga meningkatkan efisiensi spektrum sistem dengan merancang mapping symbol dengan tepat. Kinerja SCMA ditentukan dengan codebook yang bersifat sp
Externí odkaz:
https://doaj.org/article/8f5e3c8a30064b4e8ec446e1f23717df
Publikováno v:
天地一体化信息网络, Vol 4, Pp 82-88 (2023)
At the physical layer, sparse code multiple access (SCMA) technology is used to solve the problem of massive user access.In the current research on SCMA, in addition to the research on SCMA multi-user detection technology, more attention will be paid
Externí odkaz:
https://doaj.org/article/85b3b5906bce488182e94308efa75679
Publikováno v:
Photonics, Vol 11, Iss 4, p 321 (2024)
The capacity performance of visible light communication (VLC) systems can be improved by using sparse code multiple access (SCMA). Since SCMA is a codebook-based multiple access scheme, the design of the codebook is crucial. SCMA codebook performance
Externí odkaz:
https://doaj.org/article/043dbf2b13484c17904c0483f0f3a30d
Publikováno v:
IEEE Access, Vol 11, Pp 133059-133069 (2023)
In this paper, we consider an intelligent reflecting surface (IRS)-aided orthogonal time frequency space (OTFS)-based uplink sparse code multiple access (SCMA) communications system. We first conduct performance analysis in terms of pairwise error pr
Externí odkaz:
https://doaj.org/article/71967c2a76e34b75bb7edf978695eb36
Publikováno v:
IEEE Open Journal of Circuits and Systems, Vol 4, Pp 218-227 (2023)
Massive Machine-type Communications (mMTCs) is a major use case for the 5G standard. The grant-free (GF) sparse-coded multiple access (SCMA) transmission is particularly spectrum efficient in the sporadic uplink traffic, which is characteristic of th
Externí odkaz:
https://doaj.org/article/482769a96fc641d3853b099101a14c14
Publikováno v:
IEEE Access, Vol 11, Pp 39978-39989 (2023)
The cellular network coexisting with device-to-device (D2D) communications has been studied extensively. Reconfigurable intelligent surface (RIS) and non-orthogonal multiple access (NOMA) are promising technologies for the evolution of 5G, 6G and bey
Externí odkaz:
https://doaj.org/article/94898844ae2a4a2c91dd0ef2efbbc5fd
Publikováno v:
Tongxin xuebao, Vol 43, Pp 57-69 (2022)
To fulfill the stringent reliability and throughput demand of the beyond-5G and the forthcoming 6G, a novel network coding (NC) based hybrid automatic retransmission request (HARQ) for low-density parity check (LDPC) coded SCMA was proposed.Two incor
Externí odkaz:
https://doaj.org/article/f761310d9a6a47a58ef147db217f0cf6
Publikováno v:
Proceedings on Engineering Sciences, Vol 4, Iss 3, Pp 281-290 (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. There are various methods of constructing codebooks, but most of them ar
Externí odkaz:
https://doaj.org/article/ff886087d2fd482ea37b9b4d36084d77
Publikováno v:
Tongxin xuebao, Vol 43, Pp 107-113 (2022)
According to the symbol error eate (SER) of the superimposed constellation, the near-optimal space code multiple access (SCMA) codebooks were explored under uplink and downlink Rayleigh fading channels, respectively.A near-optimal codebook design sch
Externí odkaz:
https://doaj.org/article/896d5f55b8664086b0cc965bcabb2eb0
Publikováno v:
Entropy, Vol 25, Iss 11, p 1514 (2023)
The introduction of sparse code multiple access (SCMA) is driven by the high expectations for future cellular systems. In traditional SCMA receivers, the message passing algorithm (MPA) is commonly employed for received-signal decoding. However, the
Externí odkaz:
https://doaj.org/article/dda6c8e3ca6446c28719107b62d96f25