16 QAM Modulation for High Capacity Digital Radio System

Dupuis, Ph.; Joindot, Michel; Leclert, A.; Soufflet, D.

doi:10.1109/tcom.1979.1094363

Cited by 17 publications

(10 citation statements)

References 2 publications

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“…The performance of multilevel QAM operating in linear and nonlinear channels exhibiting Gaussian noise and other interference environments has been investigated by a number of researches [2][3][4]. However, much work is still required to investigate the performance of QAM in other important channels such as mobile satellite channel where fading and shadowing can affect the signaling performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a 16-ary Quadrature Amplitude Modulation for Land Mobile Satellite Data Communication

Eweda

Elagooz

Mabrouk

1997

International Conference on Aerospace Sciences and Aviation Tec

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The paper is concerned with evaluating the performance of a 16-ary quadrature amplitude modulation (QAM) signaling when transmitted through a land mobile satellite channel. The channel exhibits fading and shadowing as well as additive white Gaussian noise. Fading and shadowing cause both envelope and phase variations of the received signal. The paper derives upper bounds of the probability of error due to each one of these variations. An expression of the irreducible probability of error is also derived. The derived expressions are useful for the design of land mobile satellite data communication systems.

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Section: Introductionmentioning

confidence: 99%

Analysis of a 16-ary Quadrature Amplitude Modulation for Land Mobile Satellite Data Communication

Eweda

Elagooz

Mabrouk

1997

International Conference on Aerospace Sciences and Aviation Tec

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“…No account is taken of up-link AGN, but the results indicate that with typical nonlinear TWT amplifier 16-ary QAM signal loses its SNR advantage over 16-ary CPSK unless the signal is either predistorted or the TWT operated below saturation. Dupuis et al [3] presented a computer simulation procedure to evaluate the error probability of 16-ary QAM through a two-link nonlinear channel exhibiting AM-AM and AM-PM conversions. They included impairments such as AGN and intersymbol interference on the downlink only.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to spectrum efficient CPSK systems, digital radio transmission may use QAM signalling because of its relative simplicity of implementation and good error performance through linear channels in the presence of Gaussian noise [1]. Initial attempts at solving the problem of evaluating 16-ary QAM performance over two-link nonlinear channels were reported by Thomas et al [2] and Dupuis et al [3]. Thomas et al [2] investigated the performance of 16-ary QAM through a typical two-link nonlinear satellite channel with AGN on the down-link.…”

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confidence: 99%

Performance analysis of 16-ary QAM signalling through two-link nonlinear channels in additive Gaussian noise

Aghvami¹

1984

IEE Proc. F Commun. Radar Signal Process. UK

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This paper considers the problem of evaluating the performance of a 16-ary quadrature amplitude modulation (QAM) signal transmitted through a bandpass nonlinearity (BPNL), exhibiting AM-AM and AM-PM conversions, and in the presence of additive gaussian noise (AGN) both preceding and following the nonlinearity. An expression for the error probability is derived and computed. Also, the effect of TWT back-off from saturation on 16-ary QAM system performance is studied. Finally, as an example, a comparative study of 16-ary CPSK and 16-ary QAM transmissions is undertaken with the BPNL operated at various levels of back-off from saturation. IntroductionDue to rapid growth in demands for communication capacity, available RF bands for terrestrial and satellite communications are becoming more and more crowded. Suitable choice of efficient digital modulation techniques provides one means of achieving improved spectrum efficiency. In addition to spectrum efficient CPSK systems, digital radio transmission may use QAM signalling because of its relative simplicity of implementation and good error performance through linear channels in the presence of Gaussian noise [1]. Initial attempts at solving the problem of evaluating 16-ary QAM performance over two-link nonlinear channels were reported by Thomas et al. [2] and Dupuis et al. [3]. Thomas et al. [2] investigated the performance of 16-ary QAM through a typical two-link nonlinear satellite channel with AGN on the down-link. No account is taken of up-link AGN, but the results indicate that with typical nonlinear TWT amplifier 16-ary QAM signal loses its SNR advantage over 16-ary CPSK unless the signal is either predistorted or the TWT operated below saturation. Dupuis et al.[3] presented a computer simulation procedure to evaluate the error probability of 16-ary QAM through a two-link nonlinear channel exhibiting AM-AM and AM-PM conversions. They included impairments such as AGN and intersymbol interference on the downlink only. As expected, they demonstrated that 16-ary QAM is very sensitive to nonlinearities.As far as the author is aware, no work has been reported on the performance evaluation of 16-ary QAM transmission through two-link nonlinear channels when AGN is present on both up-and down-links. Such study is called for since 16-ary QAM is being seriously considered as a possible signalling scheme to improve the spectrum utilisation of 'bandwidth conscious' nonlinear satellite channels.In this paper, the method of Mathews and Aghvami [4] is extended to analyses the performance of 16-ary QAM transmission through a two-link nonlinear channel in the presence of AGN both preceding and following the nonlinearity. Computations of symbol error probability together with the effect of 'backing-off' the nonlinearity from saturation on system performance are given. Finally, as an example, we compare the effect of back-off on system performanes of 16-ary QAM and 16-ary CPSK transmissions.Paper 3034F (E7, E8). first 2Error probability analysis A schematic diagram of the two-link...

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“…Dupuis et al [3] have used a computer simulation to investigate the effect of intersymbol interference and other impairments and also nonlinear distortions on the performance of a 16-ary QAM digital radio system to be used in the 10.7-11.7 GHz frequency band which is assigned to digital systems in France. Yamamoto [4] in Japan has reported progress in the development of a commercial 16-QAM system (200 Mbits/s per radio channel) for use in the 4 and 5 GHz band.…”

Section: Introductionmentioning

confidence: 99%

New direct regenerator for 16-ary QAM signalling

Riris¹

1984

IEE Proc. F Commun. Radar Signal Process. UK

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This paper proposes a new 16-ary quadrature amplitude modulation (QAM) direct regenerator to be used in digital communications systems. Theoretical analysis follows to evaluate the performance of a two-link system in additive Gaussian noise (AGN) incorporating a practical 16-ary QAM direct regenerator and an ideal coherent receiver. In addition to nonlinearities and circuit limitations in the regenerator, optimum detection in the receiver is also taken into account.

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16 QAM Modulation for High Capacity Digital Radio System

Cited by 17 publications

References 2 publications

Analysis of a 16-ary Quadrature Amplitude Modulation for Land Mobile Satellite Data Communication

Analysis of a 16-ary Quadrature Amplitude Modulation for Land Mobile Satellite Data Communication

Performance analysis of 16-ary QAM signalling through two-link nonlinear channels in additive Gaussian noise

New direct regenerator for 16-ary QAM signalling

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