Results 131 to 140 of about 887 (159)

SCMA with new codebook design

2019 9th International Conference on Advances in Computing and Communication (ICACC), 2019
Sparse code multiple access (SCMA) is one of the promising non-orthogonal multiple access which utilizes iterative message passing algorithm (MPA) as decoding technique. This paper discusses about, basics of SCMA, mapping of information to codebooks, codebook structure and functioning of receiver. In SCMA, each user has their own codebook.
J Prabhavathi bhai, K Rama Naidu
openaire   +1 more source

Spherical Codes for SCMA Codebook

2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), 2016
In this paper, we investigate the application of spherical codes in a sparse code multiple access (SCMA) system. We use spherical codes to build multidimensional mother constellations for SCMA codebooks, to lower peak to average power ratio (PAPR) as well as to improve the overall spectrum efficiency.
Jinchen Bao, Zheng Ma, Mahamuda Alhaji Mahamadu, Zhongliang Zhu, Dageng Chen   +4 more
openaire   +1 more source

Low Complexity MIMO-SCMA Detector

2019 IEEE 5th International Conference on Wireless and Telematics (ICWT), 2019
The implementation of Multiple Input Multiple Output (MIMO) on the Sparse Code Multiple Access (SCMA) can enhance performance in 5G future communication. Low complexity detector for the MIMO-SCMA system to achieve near-optimum bit error rate (BER) performance is still hot topic in this research field.
Dayat Kurniawan, Mohammad Sigit Arifianto, Adit Kurniawan   +2 more
openaire   +1 more source

User capacity for uplink SCMA system

Physical Communication, 2020
Abstract Sparse Code Multiple Access (SCMA) is a non-orthogonal multiple access (NOMA) scheme which allows multi-user communication with massive connectivity. In this paper, we consider an uplink SCMA network of limited resources (time/frequency/power). We seek to answer the following question: what is the maximum number of users that can be admitted
Doaa Gamal, Ahmed Hesham Mehana, Khaled M.F. Elsayed   +2 more
openaire   +1 more source

Sparse Code Multiple Access (SCMA)

2018
Sparse Code Multiple Access (SCMA) enables non-orthogonal transmissions of multiple users’ signals among code and power domain, which could greatly improve the spectral efficiency. Due to the sparsity of the multi-dimensional codewords, the low-complexity message-passing algorithm (MPA) can be adopted and near maximum likelihood (ML) performance for ...
Zheng Ma, Jinchen Bao
openaire   +1 more source

System-level performance estimation of SCMA

2016 IEEE International Conference on Communication Systems (ICCS), 2016
Sparse code multiple access (SCMA) is a novel non-orthogonal multiple access technique, which enjoys the low complexity of message passing algorithm (MPA) and the shaping gain of multidimensional codewords. The performance of SCMA is usually evaluated by the system level simulation and represented by the block error rate (BLER) as a metric.
Ce Sun, Lei Li, Jianqiang Chen, Dai Jia, Hanxiao Yu, Jingxuan Huang, Zesong Fei   +6 more
openaire   +1 more source

SCMA Uplink Decoding with Codebook Collision

2017 IEEE 86th Vehicular Technology Conference (VTC-Fall), 2017
Sparse code multiple access (SCMA) is a non-orthogonal multiplexing technique proposed to the 5G mobile communication system, which can improve the system performance in massive connectivity scenarios. However, during the random access phase of the SCMA system, the codebook used by a user is unknown to the base station.
Yanjun Yang, Yuping Zhao, Dou Li
openaire   +1 more source

RBF-SCMA: Faster Machine Learning Based SCMA

ICC 2022 - IEEE International Conference on Communications, 2022
Ameya Vikram, Ekagra Ranjan, A. Rajesh, Prabin Kumar Bora   +3 more
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Low Complexity Techniques for SCMA Detection

2015 IEEE Globecom Workshops (GC Wkshps), 2015
Sparse code multiple access (SCMA) is a codebook- based non-orthogonal multiplexing technique. In SCMA, the procedure of bit to QAM symbol mapping and spreading of CDMA are combined together and incoming bits are directly mapped to multi-dimensional codewords of SCMA codebook sets.
Alireza Bayesteh, Hosein Nikopour, Mahmoud Taherzadeh, Hadi Baligh, Jianglei Ma   +4 more
openaire   +1 more source

Weighted message passing algorithm for SCMA

2015 International Conference on Wireless Communications & Signal Processing (WCSP), 2015
Sparse code multiple access (SCMA) is a new frequency domain non-orthogonal multiple-access technique which can make full use of limited spectrum resources in wireless communication system. In SCMA, multiple users share the same time-frequency resources of orthogonal frequency division multiple access (OFDMA).
Dacheng Wei, Yuxi Han, Sihai Zhang, Lei Liu   +3 more
openaire   +1 more source