Results 171 to 180 of about 14,247 (230)
Designand Implementation of a Novel Wideband HF Communication System Based on NC-OFDM and Probabilistic Shaping. [PDF]
Sensors (Basel)Yang R, Bai Y, Hu Z.
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Channel quality predictions assisted by new algorithms for high throughput satellite and 5G systems. [PDF]
Sci RepAl-Saegh AM +11 more
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On the Computation of 16-QAM and 64-QAM Performance in Rayleigh-Fading Channels [PDF]
, 1992 SUMMARY Quadrature Amplitude Modulation (QAM) schemes are attractive in terms of bandwidth efficiency and offer a number of subchannels with different integrities via both Gaussian and Rayleigh-fading channels, Specifically, the 16-QAM phasor constellation has two, while the 64-QAM possesses three such subchannels, which become dramatically different ...
Fortune, P.M., Hanzo, L., Steele, R.
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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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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.
Jouko Vankka +2 more
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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.
Jouko Vankka +2 more
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Symbol Error Probability of Hexagonal QAM [PDF]
IEEE Communications Letters, 2016 This letter studies the symbol error probability (SEP) of quadrature-amplitude modulation (QAM) signals constructed from the hexagonal lattice, known as hexagonal QAM or triangular QAM.
Luca Rugini
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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 0001 +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 0001 +2 more
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2007 IEEE International Conference on Communications, 2007
In this paper, we investigate block-coded QAM constructed by multilevel coding for the noncoherent generalized likelihood ratio test (GLRT) detector. For the AWGN channel, we derive a new GLRT detector and the corresponding distance. The minimum noncoherent distance of block-coded QAM is derived and two construction of noncoherent block-coded QAM (NBC ...
Ruey-Yi Wei +3 more
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In this paper, we investigate block-coded QAM constructed by multilevel coding for the noncoherent generalized likelihood ratio test (GLRT) detector. For the AWGN channel, we derive a new GLRT detector and the corresponding distance. The minimum noncoherent distance of block-coded QAM is derived and two construction of noncoherent block-coded QAM (NBC ...
Ruey-Yi Wei +3 more
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Linearity Requirements of QAM Transmitters
Optical Fiber Communication Conference, 201516, 64QAM, and higher-modulation formats impose strict linearity requirements on the modulator-driver response. We experimentally demonstrate the relation between transmitter nonlinearity and OSNR penalty. Simulations confirm experimental data for a wide range of harmonic distortion.
Stuart Hughes +5 more
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Multimode modulation and coding of QAM
IEEE Transactions on Communications, 1993A general-purpose modulation and coding implementation that is based on the quadrature amplitude modulation (QAM) family of modulation is described. The technique utilizes the 'superposed' property of certain rectangular QAM constellations, along with the fact that optimal four-state trellis codes for such constellations are essentially identical, to ...
Hong Y. Chung, Stephen G. Wilson
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