Comparison of discrete multitone and carrierless AM/PM techniques for line equalization

Shalash, Ahmed F.; Parhi, Keshab K.

doi:10.1109/iscas.1996.541786

Cited by 16 publications

(12 citation statements)

References 5 publications

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“…This is demonstrated at 40 Gbps in [9]. In addition, it is shown that CAP is superior to DMT in terms of SNR requirements and robustness towards multipath interference [10].…”

Section: Overview Of Recent Breakthroughs In Spectrally Efficient Im/mentioning

confidence: 86%

Modulation Formats for Beyond-100Gbps Ethernet Optical Links - A Review of Research

Jensen

Olmeido

Monroy

2013

Asia Communications and Photonics Conference 2013

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“…This is demonstrated at 40 Gbps in [9]. In addition, it is shown that CAP is superior to DMT in terms of SNR requirements and robustness towards multipath interference [10].…”

Section: Overview Of Recent Breakthroughs In Spectrally Efficient Im/mentioning

confidence: 86%

Modulation Formats for Beyond-100Gbps Ethernet Optical Links - A Review of Research

Jensen

Olmeido

Monroy

2013

Asia Communications and Photonics Conference 2013

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“…It is interesting to note that OPAM is very similar to what has been originally understood as carrier-less amplitude and phase (CAP) modulation [19], where instead of quadrature up-and down-conversion band-pass filters are…”

Section: Block Transmission With Fdementioning

confidence: 96%

Transmission schemes for visible light communications in multipath environments

Wolf

Cheema

Khalighi

et al. 2015

2015 17th International Conference on Transparent Optical Networks (ICTON)

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Discrete multitone transmission (DMT) is a useful approach to cope with the dispersive nature of VLC indoor channels. In such environments, the dispersion occurs either due to the LED in combination with its driver and or the multipath propagation channel. In this paper, we consider the impact of both types of dispersions on the bit error rate performance of a DMT based Li-Fi system. However, the main goal of this work is to compare the DMT scheme results with the transmission strategies employing frequency domain equalization. Here, we distinguish between pulse-amplitude modulation (PAM), partial-response coding, single-subcarrier (SSC) modulation, and "carrier-less amplitude and phase" (CAP) modulation. Keywords: visible light communication (VLC), Li-Fi, orthogonal frequency division multiplex (OFDM), discrete multitone transmission (DMT), block transmission, frequency domain equalization (FDE), wireless infrared (IR) transmission, polymer optical fiber (POF) communication, DC-balanced codes, partial-response coding INTRODUCTIONVisible light communication (VLC) uses the visible light portion of the electromagnetic spectrum to transmit data. It has become more and more attractive, since the LED lighting sources in homes, workplaces, factories or streets can additionally be used for wireless communication. Meanwhile, Li-Fi is an accepted term to describe this Wi-Fi analogy.In this work, we focus on the comparison of suitable transmission schemes for VLC based Li-Fi systems. Specifically, we consider only transmission schemes which ensure a DC-balance and thus a constant, data independent brightness, or schemes which can be easily combined with DC-balanced line codes. In order to take into account the bandwidth limitation caused by the LED in combination with its driver, we employ a Gaussian low-pass filter model at the transmitter. We do not claim that this model is generally valid, but the measurement results presented in [1] suggest rather a steep than a gradually roll-off beyond the upper cut-off frequency, which is said to be between 60 MHz and 180 MHz for a common high-power phosphorescent white-light LED with an optimized driver [1]. We also consider the effect of multipath propagation, if several spatially separated LEDs are used for illumination. Here we use simulated impulse responses, where high order diffuse reflections have been also taken into account.Discrete multitone transmission (DMT) is a promising approach to cope with the bandwidth limitation of the LED/LED-driver combo [2, 3]. Here we consider DC-biased DMT, since it inherently provides a DC-balance. DMT can be interpreted as a real valued variant of orthogonal frequency division multiplex (OFDM), where no quadrature up-conversion takes place after the inverse fast Fourier transform (IFFT) and digital-to-analog conversion at the transmitter. For VLC, it is impossible to modulate the field of a pair of sinusoidal high frequency (optical) carriers with a 90 • phase shift, since the LED-light source is strongly non-coherent. The optical field ap...

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“…However, for high speed transmission, CAP modulation has been demonstrated to be simpler and has better performance than discrete multitone (DMT) [15]. Multi carrier modulation format like DMT is much more complex compared to CAP where inverse fast Fourier transform (IFFT) and fast Fourier transform (FFT) are needed in modulation and demodulation process while on the other hand, CAP uses a filter or digital convolution with less computational complexity.…”

Section: Cap Motivationmentioning

confidence: 99%

A Carrierless Amplitude Phase (CAP) Modulation Format: Perspective and Prospect in Optical Transmission System

Ridzuan

Abdullah

Othman

et al. 2018

IJECE

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The explosive demand of broadband services nowadays requires data communication systems to have intensive capacity which subsequently increases the need for higher data rate as well. Although implementation of multiple wavelengths channels can be used (e.g. 4 × 25.8 Gb/s for 100 Gb/s connection) for such desired system, it usually leads to cost increment issue which is caused by employment of multiple optical components. Therefore, implementation of advanced modulation format using a single wavelength channel has become a preference to increase spectral efficiency by increasing the data rate for a given transmission system bandwidth. Conventional advanced modulation format however, involves a degree of complexity and costly transmission system. Hence, carrierless amplitude phase (CAP) modulation format has emerged as a promising advanced modulation format candidate due to spectral efficiency improvement ability with reduction of optical transceiver complexity and cost. The intriguing properties of CAP modulation format are reviewed as an attractive prospect in optical transmission system applications.

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Comparison of discrete multitone and carrierless AM/PM techniques for line equalization

Cited by 16 publications

References 5 publications

Modulation Formats for Beyond-100Gbps Ethernet Optical Links - A Review of Research

Modulation Formats for Beyond-100Gbps Ethernet Optical Links - A Review of Research

Transmission schemes for visible light communications in multipath environments

A Carrierless Amplitude Phase (CAP) Modulation Format: Perspective and Prospect in Optical Transmission System

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