Results 181 to 190 of about 76,661 (236)
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Analysis of throughput and error rate of 16-QAM, 64-QAM, and 256-QAM O-NOMA waveforms
Journal of Optical Communications, 2023Abstract This study presents a comprehensive analysis of the throughput performance, spectrum efficiency, and block error rate (BLER) of optical non-orthogonal multiple access (O-NOMA) waveforms using 16-quadrature amplitude modulation (QAM), 64-QAM, and 256-QAM modulation schemes.
Arun Kumar, Nidhi Gour, Himanshu Sharma
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IEEE transactions on microwave theory and techniques, 2020
This article presents a 5G 37–42-GHz $8\times 8$ phased array. The array is based on $2\times 2$ SiGe transmit/receive (TRX) beamformer chips in the SiGe technology with 6 bits of phase control and 8 bits of gain control.
Yusheng Yin +6 more
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This article presents a 5G 37–42-GHz $8\times 8$ phased array. The array is based on $2\times 2$ SiGe transmit/receive (TRX) beamformer chips in the SiGe technology with 6 bits of phase control and 8 bits of gain control.
Yusheng Yin +6 more
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A hybrid lightwave subcarrier CATV/16-QAM/16-QAM OFDM transmission system
Asia Communications and Photonics Conference 2013, 2013A hybrid lightwave subcarrier CATV/16-QAM/16-QAM orthogonal frequency-division multiplexing (OFDM) transmission system employing light injection/optoelectronic feedback techniques and photonic crystal fiber (PCF) is proposed and demonstrated. Good performance of carrier-to-noise ratio (CNR), composite second order, and composite triple beat were ...
Chia-Yi, Chen +5 more
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A 24-29.5 GHz 256-Element 5G Phased-Array with 65.5 dBm Peak EIRP and 256-QAM Modulation
Intelligent Memory Systems, 2020This paper presents a 24-29.5 GHz 256-element phased-array for 5G applications. The array is based on commercial 2×2 TRX beamformer chips, designed with SiGe BiCMOS technology, which employ 6 bits of phase control and 8 bits of gain control.
Yusheng Yin +4 more
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10 Tbit/s QAM Quantum Noise Stream Cipher Coherent Transmission over 160 km
Optical Fiber Communications Conference and Exhibition, 2020We present the first 10 Tbit/s secure physical layer transmission over 160 km with a spectral efficiency of 6 bit/s/Hz by using digital coherent QAM quantum noise stream cipher (QNSC) and injection-locked WDM techniques.
Masato Yoshida +4 more
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International Journal on Wireless & Optical Communications, 2003
A quotient coded quadrature amplitude modulation system having only a finite number of transmitted signal amplitudes is proposed. The expression to estimate the Symbol-Error-Rate (SER) performance of the quotiently coherent demodulated QAM (QQAM) system over a multiplicative Rayleigh fading channel is obtained.
Mingwei Wu +2 more
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A quotient coded quadrature amplitude modulation system having only a finite number of transmitted signal amplitudes is proposed. The expression to estimate the Symbol-Error-Rate (SER) performance of the quotiently coherent demodulated QAM (QQAM) system over a multiplicative Rayleigh fading channel is obtained.
Mingwei Wu +2 more
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Journal of Lightwave Technology, 2020
We use the generalized pair-wise optimization (PO) algorithm to optimize the geometrically shaped 32-ary quadrature amplitude modulation (GS-32-QAM) constellation and adopt the probabilistic fold shaping (PFS) scheme to generate the probabilistically ...
Junjie Ding +5 more
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We use the generalized pair-wise optimization (PO) algorithm to optimize the geometrically shaped 32-ary quadrature amplitude modulation (GS-32-QAM) constellation and adopt the probabilistic fold shaping (PFS) scheme to generate the probabilistically ...
Junjie Ding +5 more
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ISCAS'99. Proceedings of the 1999 IEEE International Symposium on Circuits and Systems VLSI (Cat. No.99CH36349), 2003
A multicarrier QAM modulator has been developed and simulated. The multicarrier QAM modulator contains four upconversion circuits. Each upconverting circuit accepts 12 b in-phase and quadrature data streams, interpolates those by 16 and upconverts the baseband signal to a selected center frequency.
J. Vankka, M. Kosunen, K. Halonen
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A multicarrier QAM modulator has been developed and simulated. The multicarrier QAM modulator contains four upconversion circuits. Each upconverting circuit accepts 12 b in-phase and quadrature data streams, interpolates those by 16 and upconverts the baseband signal to a selected center frequency.
J. Vankka, M. Kosunen, K. Halonen
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Different QAM schemes analyses for ARS fading channels
Transactions on Emerging Telecommunications Technologies, 2020Quadrature amplitude modulation (QAM) techniques are employed for various communication systems due to its advantages such as efficient bandwidth and high rate.
M. Bilim
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CP-OFDM Achieves the Lowest Average Ranging Sidelobe Under QAM/PSK Constellations
IEEE Transactions on Information TheoryThis paper aims to answer a fundamental question in the area of Integrated Sensing and Communications (ISAC): What is the optimal communication-centric ISAC waveform for ranging?
Fan Liu +7 more
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