Results 21 to 30 of about 18,514,999 (137)

Optimized Low Density Superposition Modulation for 5G Mobile Multimedia Wireless Networks

IEEE Access, 2019
The explosive growth of mobile multimedia services and applications are increasing the demand of access ability for the recent 5G networks. Non-orthogonal multiple access (NOMA) techniques have been recently proposed for 5G to improve access efficiency ...
Kun Lu, Chengxin Jiang
doaj   +1 more source

A Deep Learning-Based Approach to Power Minimization in Multi-Carrier NOMA With SWIPT

IEEE Access, 2019
Simultaneous wireless information and power transfer (SWIPT) and multi-carrier non-orthogonal multiple access (MC-NOMA) are promising technologies for future fifth generation and beyond wireless networks due to their potential capabilities in energy ...
Jingci Luo, Jie Tang, Daniel K. C. So, Gaojie Chen, Kanapathippillai Cumanan, Jonathon A. Chambers   +5 more
doaj   +1 more source

Fairness-aware Joint Pattern and Power Design for Downlink PDMA Systems

Journal of Telecommunications and Information Technology
Pattern division multiple access (PDMA) is recognized as a promising non-orthogonal multiple access technique for overloaded wireless systems, capable of being used for multiplexing multiple users over a limited set of resources.
Farhad E. Mahmood
doaj   +1 more source

Repeat accumulate code division multiple access and its hybrid detection

, 2008
In this paper, we propose the novel concept of Repeat Accumulate Code Division Multiple Access (RA-CDMA), which employs unique, user-specific channel code generator matrices (interleavers) for differentiating the users.
Chen, Sheng, Xu, Lei, Zhang, Rong, Hanzo, Lajos   +3 more
core   +2 more sources

Massively Concurrent Non-Orthogonal Multiple Access for 5G Networks and Beyond

IEEE Access, 2019
We propose a new signal spreading-based non-orthogonal multiple access (NOMA) schemes that exploits the frame-theoretic design principles to enable the efficient concurrence of multiple users in both downlink (DL) and uplink (UL).
Razvan-Andrei Stoica, Giuseppe Thadeu Freitas De Abreu, Takanori Hara, Koji Ishibashi   +3 more
doaj   +1 more source

Investigating power scaling factor for pattern division multiple access [PDF]

Pattern division multiple access (PDMA) is a one type of multi-domain non-orthogonal multiple access (NOMA) that support massive connectivity and can improve spectral efficiency. The unique pattern is used by each user to map its transmitting data into a
Alwiyah, Nisa, Meylani, Linda, Hidayat, Iswahyudi, Widhi Prabowo, Vinsensius Sigit   +3 more
core   +1 more source

Research on improved multiple users detection algorithm in pattern division multiple access system

, 2023
Receiver detection algorithm has always been a research hotspot in communication system and the key point to determine the performance of 5G system. Both industry and academia have been committed to finding detection algorithms with lower complexity and ...
Han, Guofeng, Wang, Zedai, Tang, Wanwei, Zhao, Jinlong, Wang, Lixia, Yue, Xinwei   +5 more
core   +1 more source

A novel uplink multiple access scheme based on TDS-FDMA

, 2011
This contribution proposes a novel time-domain synchronous frequency division multiple access (TDS-FDMA) scheme to support multi-user uplink application.
Dai, Linglong, Sheng Chen, Zhaocheng Wang, Chen, Sheng, Wang, Zhaocheng, Linglong Dai   +5 more
core   +2 more sources

Lead‐free halide perovskites for efficient light‐emitting devices

FlexMat, EarlyView.
Overview of Lead‐free metal halide perovskites with different categories and optoelectronic application directions, including solid‐state lighting, light‐emitting diodes, piezoluminescence, flexible electronics, scintillators and CPL emitters. Abstract Lead halide perovskites exhibit promising optoelectronic properties for optoelectronic applications ...
Yueqi Shen, Kefan Meng, Yiqi Zhao, Chaoran Zhou, Jiaye Shu, Di Zhang, Chengqian Cao, Wanxin Chen, Yefeng Zhou, Weihua Ning   +9 more
wiley   +1 more source

Challenges and Opportunities for Layered Double Perovskite Solar Cells

Solar RRL, Volume 10, Issue 17, 15 September 2026.
Layered lead‐free double perovskites suffer from intrinsic and extrinsic limitations that hinder high photovoltaic performance. This review identifies key challenges, including unfavorable band structures, strong self‐trapping, defect‐induced recombination, processing‐induced inhomogeneity, and device‐level mismatches.
Krishnaiah Mokurala, Marija Mrkonjić, Ceylan Doyranli, Jovana V. Milić, Mohammad Reza Golobostanfard   +4 more
wiley   +1 more source