Results 21 to 30 of about 76,661 (236)

Transmission of OCDM Based on Asymmetric Pair Mapping Over a Seven Core Fiber

IEEE Photonics Journal, 2022
In this paper, transmission of orthogonal chirp division multiplexing (OCDM) based on asymmetric pair mapping over a seven core fiber is proposed. High-order 32 quadrature amplitude modulation (QAM) is reduced to quadrature phase-shift keying (QPSK) and ...
Shuaidong Chen, Bo Liu, Jianxin Ren, Yaya Mao, Xiangyu Wu, Rahat Ullah, Xiumin Song, Yu Bai, Yibin Wan, Suiyao Zhu, Yongfeng Wu, Lilong Zhao, Tingting Sun   +12 more
doaj   +1 more source

Exact Bit Error-Rate Analysis of Two-User NOMA Using QAM With Arbitrary Modulation Orders

IEEE Communications Letters, 2020
This letter considers the exact bit error rate (BER) analysis of a two-user non-orthogonal multiple access (NOMA) system using square quadrature amplitude modulation (QAM).
Tasneem Assaf, A. Al-Dweik, M. E. Moursi, H. Zeineldin, M. Al-jarrah   +4 more
semanticscholar   +1 more source

Pengaruh Link Relay Terhadap Kinerja Komunikasi Kooperatif Vehicle-to-Vehicle (V2V)

Jurnal Elkomika, 2022
ABSTRAK Kebutuhan komunikasi bergerak saat ini sangat tinggi, Vehicular Ad-hoc Network (VANET) merupakan metode teknologi telekomunikasi untuk komunikasi bergerak pada kendaraan.
ISNAN MUHARRAM, RAMZI ADRIMAN, NASARUDDIN NASARUDDIN   +2 more
doaj   +1 more source

Comparison of 128-SP-QAM with PM-16-QAM

Optics Express, 2012
In this paper we investigate an interesting modulation format for fiber optic communications, set-partitioning 128 polarization-multiplexed 16-QAM (128-SP-QAM), which consists of the symbols with even parity from the symbol alphabet of polarization-multiplexed 16-QAM (PM-16-QAM).
Martin, Sjödin, Pontus, Johannisson, Jianqiang, Li, Erik, Agrell, Peter A, Andrekson, Magnus, Karlsson   +5 more
openaire   +2 more sources

Experimental Demonstration of Geometrically-Shaped Constellations Tailored to the Nonlinear Fibre Channel [PDF]

, 2018
A geometrically-shaped 256-QAM constellation, tailored to the nonlinear optical fibre channel, is experimentally demonstrated. The proposed constellation outperforms both uniform and AWGN-tailored 256-QAM, as it is designed to optimise the trade-off ...
Bayvel, P., Killey, R. I., Lavery, D., Semrau, D., Sillekens, E.   +4 more
core   +2 more sources

Theoretical and experimental design of an alternative system to 2 x 2 MIMO for LTE over 60 km directly modulated RoF link [PDF]

, 2012
Relay nodes (RN) are used as an important structure to extend the coverage of the Third Generation Partnership Program’s Long Term Evolution (3GPP-LTE). The promising technology as the interface between eNodeB (eNB) and RN is radio-over-fibre (RoF), due ...
Ghassemlooy, Zabih, Kanesan, Thavamaran, Lu, Chao, Ng, Wai Pang   +3 more
core   +1 more source

On the ASER performance of amplify-and-forward relaying MIMO/FSO systems using SC-QAM signals over log-normal and gamma-gamma atmospheric turbulence channels and pointing error impairments

Journal of Information and Telecommunication, 2020
In this work, we analyse pointing error effects on the performance of amplify-and-forward (AF) relaying multiple-input multiple-output (MIMO) free-space optical (FSO) communication system employing sub-carrier quadrature amplitude modulation (SC-QAM ...
Duong Huu Ai, Ha Duyen Trung, Do Trong Tuan   +2 more
doaj   +1 more source

Modulation Scheme Identification Based on Artificial Neural Network Algorithms for Optical Communication System

Journal of ICT Research and Applications, 2020
Higher-order modulation schemes in optical communication systems that suffer from several impairments can use artificial intelligence (AI) algorithms, among other possible techniques, to mitigate these issues.
Mustafa A. Jalil, Jenan Ayad, Hanan J. Abdulkareem   +2 more
doaj   +1 more source

Noise Shaping Enhanced DMT Signal Transmission Utilizing Low-Resolution DAC

IEEE Photonics Journal, 2021
In order to reduce the quantization noise of low-resolution DAC, we study a noise shaping technique that can reshape the white quantization noise to an irregular spectrum, in which the noise in the data subcarrier band is almost transformed into the null
Fan Li, Zhibin Luo, Ke Bai, Mingzhu Yin, Dongdong Zou, Wei Wang, Xiaowu Wang, Wenqin Tan, Qi Sui, Zhaohui Li   +9 more
doaj   +1 more source

Correlation scheme of frame synchronization in communication systems with QPSK-modulation

Tekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2017
The information efficiency of communication systems using quadrature amplitude modulation is reduced because of the costs for data transmission necessary to provide frame synchronization and the required time to search for the sync signal and to go into ...
A. V. Sadchenko, O. A. Kushnirenko, O. I. Yefimov, V. V. Punko, S. Y. Parovyi   +4 more
doaj   +1 more source