Latency considerations for adaptive modulation in an interference-free slow Rayleigh fading channel

Torrance, J.M.; Hanzo, Lajos

doi:10.1109/vetec.1997.600522

Cited by 14 publications

(8 citation statements)

References 7 publications

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“…The basic idea is as following: if the bit error rate (BER) in the channel exceeds a given threshold, the number of transmitted bits per symbol is reduced (reducing the transmission rate in the channel), while keeping the transmitted average symbol energy at a constant level [6][7][8][9][10][11]. This improves the BER and, consequently, the packet error rate (PER).…”

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confidence: 99%

Analytical Comparison of the Performance of Adaptive Modulation and Coding in Wireless Network Under Rayleigh Fading

Bandiri

Braga

Spadoti

2017

J. Microw. Optoelectron. Electromagn. Appl.

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I. INTRODUCTION The rapid growth in the use of information networks, increasing the data rates, led to the necessity to implement novel technique aiming to improve wireless networks communication performance. In conventional communication systems, transmission characteristics are adjusted for the worst channel setting behavior in order to provide a lower limit to a specific error rate [1]. Adaptive Modulation and Coding (AMC), which includes both adaptive modulation (AdM) and adaptive Forward Error Correction (AdFEC) operating together, have been developed to face fading and enhance the wireless systems performance. They maximize bandwidth efficiency through selecting an optimal combination from the modulation and coding scheme (MCS), where the resolution depends on the channel state information. Consequently, every modulation and code scheme will be linked to a constellation size and coding rate respectively [2]. AMC allows spectrally efficient transmission in function of time-

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confidence: 99%

Analytical Comparison of the Performance of Adaptive Modulation and Coding in Wireless Network Under Rayleigh Fading

Bandiri

Braga

Spadoti

2017

J. Microw. Optoelectron. Electromagn. Appl.

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“…B URST-BY-BURST adaptive multilevel modulation was first suggested in [1]- [3] for slowly fading wireless pedestrian channels, inspiring intensive further research in recent years [4]- [15]. The proposed schemes provide a means of realizing some of the time-variant channel capacity potential of the fading wireless channel [17], [19], invoking a more robust transmission scheme (TS) on a burst-by-burst basis, when the channel is of low quality and vice versa, while maintaining a certain target bit error rate (BER) performance.…”

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confidence: 99%

Interference aspects of adaptive modems over slow Rayleigh fading channels

Torrance

Hanzo

Keller

1999

IEEE Trans. Veh. Technol.

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Adaptive modulation can achieve channel capacity gains by adapting the number of bits per transmission symbol on a burst-by-burst basis, in harmony with channel quality fluctuations. This is demonstrated in the paper for target bit error rates of 1 and 0.01%, respectively, in comparison to conventional fixed modems. However, the achievable gains depend strongly on the prevalant interference levels and hence interference cancellation is invoked on the basis of adjusting the demodulation decision boundaries after estimating the interfering channel's magnitude and phase. Using the modem-mode switching levels of Table X and with the aid of interference cancellation, target BER's of 1 and 0.01% can be maintained over slow-fading channels for a wide range of channel Signal-to-noise ratios (SNR) and Signal-tointerference ratios (SIR), as seen in Figs. 20 and 21, respectively.

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“…Adaptive modulation has been proposed to exploit the timevariant Signal-to-noise ratio (SNR) of slowly-fading pedestrian indoors channels [l, 21, while its latency aspects have been studied in [3]. In this treatise a statistical multiplexing scheme is proposed in order to mitigate the associated delay, which arises due to disabling transmissions during the low instantaneous channel SNR intervals of slowly-fading channels.…”

Section: Introductionmentioning

confidence: 99%

“…In this treatise a statistical multiplexing scheme is proposed in order to mitigate the associated delay, which arises due to disabling transmissions during the low instantaneous channel SNR intervals of slowly-fading channels. In our previous studies a lower-delay, bit error rate (BER) speech system and a BER, higherintegrity, higher latency data system were characterised [3].…”

Section: Introductionmentioning

confidence: 99%