Results 1 to 10 of about 76,661 (236)
Design, comparative study and analysis of CDMA for different modulation techni
Egyptian Informatics Journal, 2015 In this work, we have design a MIMO–CDMA using 4 ∗ 8 antennas with the combination of MMSE (Minimum Mean square Error Equalizer) for BPSK (Binary Phase shift Keying), QPSK (Quadrature Phase Shift Keying), 16-QAM, 64-QAM and 256-QAM (Quadrature Amplitude ...
Arun Kumar, Manisha Gupta
doaj +4 more sources
IEEE Open Journal of the Communications Society, 2021 Communication system’s performance is sensitive to bandwidth, power, cost etc. There have been various solutions to improve the performance, out of them, one of the fundamental solutions over the years is design of optimum modulation schemes.
Praveen Kumar Singya +4 more
doaj +2 more sources
Jurnal Nasional Teknik Elektro dan Teknologi Informasi, 2023 Generalized frequency division multiplexing (GFDM) merupakan sistem multicarrier masa datang yang bersifat nonortogonal. GFDM merupakan teknik transmisi data berbentuk blok yang setiap subcarrier-nya dibentuk dari pulsa berbentuk nonrectangular ...
Ari Endang Jayati, Budiani Destyningtias
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A Novel QAM Technique for High Order QAM Signaling
Radioengineering, 2011 The paper proposes a novel spread quadrature amplitude modulation (S-QAM) technique with high SNR improvement for high-order QAM channels. Simulated and experimental bit error rate (BER) performance analyses of the proposed technique in blind and non ...
A. Ozen
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Improved Two-Dimensional Double Successive Projection Algorithm for Massive MIMO Detection [PDF]
International Journal of Electronics and Telecommunications, 2023 In a massive multiple-input multiple-output (MIMO) system, a large number of receiving antennas at the base station can simultaneously serve multiple users.
Sourav Chakraborty +2 more
doaj +1 more source
High-Rate Continuous Variable Quantum Key Distribution Based on Probabilistically Shaped 64 and 256-QAM [PDF]
European Conference on Optical Communication, 2021 We designed a CV-QKD system with off-the-shelf components and established the feasibility of distributing 67.6 and 66.8 Mb/s secret key rates on average over a 9.5 km SMF link, using respectively probabilistically shaped 64 and 256 QAM, and relying on a ...
François Roumestan +5 more
semanticscholar +1 more source
A Novel Low Complexity Faster-than-Nyquist (FTN) Signaling Detector for Ultra High-Order QAM [PDF]
IEEE Open Journal of the Communications Society, 2021 Faster-than-Nyquist (FTN) signaling is a promising non-orthogonal pulse modulation technique that can improve the spectral efficiency (SE) of next generation communication systems at the expense of higher detection complexity to remove the introduced ...
Ahmed Ibrahim +2 more
semanticscholar +1 more source
Analisis Perbandingan Kinerja Sistem Radio Over Fiber Modulasi Optik Langsung dan Eksternal
Jurnal Elkomika, 2023 ABSTRAK Radio Over Fiber (ROF) adalah sistem komunikasi yang digunakan untuk mentransmisikan sinyal radio frequency (RF) melalui serat optik. Kapasitas dan mobilitas jaringan akses dapat ditingkatkan dengan memanfaatkan sistem ROF. Modulasi sinyal optik
FEBRIZAL UJANG, AINUL YAKIN
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Optics Express, 2023 A probabilistic shaping (PS) quadrature amplitude modulation (QAM) based on Y-00 quantum noise stream cipher (QNSC) has been proposed. We experimentally demonstrated this scheme with data rate of 201.6Gbit/s over a 1200-km standard single mode fiber ...
Jihui Sun +7 more
semanticscholar +1 more source
A Study of a Millimeter-Wave Transmitter Architecture Realizing QAM Directly in RF Domain
IEEE Transactions on Circuits and Systems Part 1: Regular Papers, 2023 Realization of high-order modulation schemes directly in the RF domain enables the generation of spectrally efficient $4^{M}$ quadrature-amplitude-modulated ( $4^{M}$ QAM) symbols using the vectorial summation of $M$ quadrature phase-shift keying ...
Mohammad Oveisi, Huan Wang, P. Heydari
semanticscholar +1 more source