Zobrazeno 1 - 10
of 10 922
pro vyhledávání: '"QAM"'
Publikováno v:
Radioengineering, Vol 33, Iss 1, Pp 195-203 (2024)
Weak target detection is a great challenging in radar field. To detect weak targets via radar communication integrated signal, a method for constructed step-LFM (CStep-LFM) signal is proposed based on quadrature amplitude modulation-orthogonal freque
Externí odkaz:
https://doaj.org/article/5304f420dc8d405194b52262b403f929
Autor:
Mohammed G. Al-Hamiri, Haider J. Abd
Publikováno v:
Results in Optics, Vol 16, Iss , Pp 100675- (2024)
Light fidelity (LiFi) is one of the most promising areas within wireless optical communication system. It provides many benefits, including high capacity, improved security and enhanced cost-effectiveness. However, there is still challenges which are
Externí odkaz:
https://doaj.org/article/b8dac36be1784a8593d3884e0d86cf61
Publikováno v:
Guangtongxin yanjiu, Pp 23010301-23010308 (2024)
【Objective】The commonly used max-log-map algorithm reduces the complexity of soft information computation compared to the log-map algorithm. However, it still consumes significant resources for high-order Orthogonal Amplitude Modulation (QAM), su
Externí odkaz:
https://doaj.org/article/3ff7ee8dca834f9cb3d455c28f52372d
Autor:
Georgios Konstantopoulos, Yves Louet
Publikováno v:
IEEE Open Journal of the Communications Society, Vol 5, Pp 4337-4353 (2024)
In this work, we investigate the optimal beamformer design for the downlink of Multiple-Input Single-Output (MISO) Non-Orthogonal Multiple Access (NOMA), mainly focusing on a two-user scenario. We derive novel closed-form expressions for the Bit Erro
Externí odkaz:
https://doaj.org/article/d087a6d3ae6149e2815d907a8e300425
Autor:
Taejun Jang, Joon Ho Cho
Publikováno v:
IEEE Access, Vol 12, Pp 3736-3755 (2024)
Recently, it is shown that a spectrally-efficient low-complexity quadrature amplitude modulation (QAM) filter-bank multicarrier (FBMC) system can be designed by relaxing the constraints on the time-frequency (TF) product at the transmitter (TX) and t
Externí odkaz:
https://doaj.org/article/e3cae99f10b34de8b913c26bf3db8bc8
Autor:
Hasan k. Al Deen, Haider J. Abd
Publikováno v:
Journal of Telecommunications and Information Technology, Vol 2, Iss 2 (2024)
Rapid development of 5G networks encourages researchers to improve the radio-over-fiber (RoF) technique in order to reach 10 Gbps data transmission rates, to increase bandwidth and range, while reducing latency and implementation cost. This paper eva
Externí odkaz:
https://doaj.org/article/51ee8ac0ae384334a940cb94b7e47453
Publikováno v:
Guangtongxin yanjiu, Pp 23-29 (2023)
Free Space Optical (FSO) communication systems are easily affected by atmospheric turbulence effects. In order to reduce the Bit Error Rate (BER) of the system under saturated turbulence condition, and considering the requirement of maximum diversity
Externí odkaz:
https://doaj.org/article/db83c7ee75634d67a5269981143320c6
Publikováno v:
Sensors, Vol 24, Iss 15, p 5038 (2024)
In our paper, we propose a generalized version of the Alternating Projections Digital Hard Successive Interference Cancellation (AP-HSIC) algorithm that is capable of decoding any order of constellation M in an M-Quadrature Amplitude Modulation (QAM)
Externí odkaz:
https://doaj.org/article/c6a5f49a1f5a4fa68a9e5cf3c696439a
Publikováno v:
Drones, Vol 8, Iss 7, p 300 (2024)
Unmanned aerial vehicles (UAVs) are extensively employed in pursuit, rescue missions, and agricultural applications. These operations require substantial data and video transmission, demanding significant spectral resources. The ultra-broad bandwidth
Externí odkaz:
https://doaj.org/article/85cf86bd9b654d9ba4c80b5538f27d9e
Autor:
Jiexin Chen, Qi Zhang, Qihan Zhao, Xiangjun Xin, Ran Gao, Haipeng Yao, Feng Tian, Yongjun Wang, Qinghua Tian, Leijing Yang, Lan Rao, Fu Wang, Sitong Zhou
Publikováno v:
Photonics, Vol 11, Iss 7, p 584 (2024)
In this paper, a subset-optimized eight-dimensional trellis-coded quadrature amplitude modulation (SO-8DTCM-16QAM) format for higher-order constellations in high-speed optical communications is proposed. This scheme increases the number of subsets of
Externí odkaz:
https://doaj.org/article/45fa9fa1f32c459890858ef1a0b6e545