Reproducing Single-Carrier Digital Modulation Schemes for VLC by Controlling the First Switching Harmonic of the DC–DC Power Converter Output Voltage Ripple

Rodríguez, Juan; Lamar, Diego G.; Miaja, Pablo F.; Sebastián, J.

doi:10.1109/tpel.2017.2774178

Cited by 39 publications

(22 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…where f (θ i ) is given in (9). By noting that the real and imaginary parts of r i are independent, and dropping the index i for notational simplicity, then f (r i |α i , θ i , s m ) can be written as…”

Section: Optimum Ac Detectormentioning

confidence: 99%

Error Rate Analysis of Amplitude-Coherent Detection Over Rician Fading Channels With Receiver Diversity

Al‐Jarrah

Park

Al-Dweik

et al. 2020

IEEE Trans. Wireless Commun.

View full text Add to dashboard Cite

Amplitude-coherent (AC) detection is an efficient detection technique that can simplify the receiver design while providing reliable symbol error rate (SER). Therefore, this work considers AC detector design and SER analysis using M -ary amplitude shift keying (MASK) modulation over Rician fading channels. More specifically, we derive the optimum, near-optimum and a suboptimum AC detectors and compare their SER to the coherent, noncoherent and the heuristic AC detectors. Moreover, the analytical SER of the heuristic detector is derived using two different approaches for single and multiple receiving antennas. One of the derived expressions is expressed in terms of a single integral that can be evaluated numerically, while the second approach gives a closed-form analytical expression for the SER, which is also used to derive a simple formula for the asymptotic SER at high signal-to-noise ratios (SNRs).The obtained analytical and simulation results show that the SER of the AC and coherent MASK detectors are comparable, particularly for high values of the Rician K-factor, and small number of receiving antennas. Moreover, the obtained results show that the SER of the optimal AC detector is equivalent to that of the coherent detector.However, the optimal AC detector complexity is prohibitively high, particularly at high SNRs. In most of the scenarios, the heuristic AC detector significantly outperforms the optimum noncoherent detector, except for the binary ASK case at low SNRs. Moreover, the obtained results show that the heuristic AC detector is immune to phase noise, and thus, it outperforms the coherent detector in scenarios where system is subject to considerable phase noise.keywords: Optical wireless communications (OWC), free space optics (FSO), non-coherent, semi-coherent, amplitudecoherent, Rician, Ricean, receiver diversity, phase noise. the channel gain, which can be obtained blindly and efficiently for single and multicarrier modulation schemes [30].The channel phase information is not required, which is the main factor that contributes to the complexity reduction of the detector. The optimum, suboptimum and a heuristic detectors are derived in Rayleigh fading channels, and the performance of the heuristic detector is evaluated with and without perfect knowledge of the channel gain in [1] and [30], respectively. The optimum amplitudes of the transmitted MASK symbols are then derived for multibranch detectors in [31]. However, the Rayleigh fading model is limited to wireless applications with no line-of-sight (LoS) signal component. Therefore, applying the AC detector and evaluating its performance in a more general channel model is indispensable.Consequently, this paper considers applying the AC detection technique to communications system in Rician fading channels with single and multiple receiving antennas. More specifically, the optimum AC detector is derived, and its SER is compared with the optimum coherent and noncoherent MASK detectors. Moreover, the SER of the heuristic detector [1] is derived usin...

show abstract

Section: Optimum Ac Detectormentioning

confidence: 99%

Error Rate Analysis of Amplitude-Coherent Detection Over Rician Fading Channels With Receiver Diversity

Al‐Jarrah

Park

Al-Dweik

et al. 2020

IEEE Trans. Wireless Commun.

View full text Add to dashboard Cite

show abstract

“…However, there is a lack of technical analysis and some important issues, such as the dependence of the HB-LED behavior on the operating temperature, are not considered. In [13], a two-phase synchronous buck converter able to reproduce single-carrier digital modulation schemes by controlling its output voltage ripple is presented. Since the first switching harmonic acts as the carrier of the reproduced modulation scheme, the approach provides the highest ratio between the bit rate and the required switching frequency.…”

Section: (B)]mentioning

confidence: 99%

Performance evaluation of a VLC transmitter based on the split of the power

Rodríguez

Aller

Lamar

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

Self Cite

View full text Add to dashboard Cite

Abstract-Visible Light Communication (VLC) has gained relevance during last years. It consists in using High-Brightness LEDs (HB-LEDs) both for lighting and for transmitting information changing the light intensity rapidly. However, there are some bottlenecks that are slowing down the deployment of this technology. One of the most important problems is that the HB-LED drivers proposed for addressing high data rates in VLC achieve poor power efficiency. Since these HB-LED drivers must be able to reproduce fast current waveforms, the use of Linear Power Amplifiers (LPAs) has been adopted, which clearly damage the power efficiency of HB-LED lighting. In order to alleviate this problem, a HB-LED driver made up of two DC-DC power converters is presented in this work. One of them is responsible for performing the communication functionality by operating at high switching frequency (10 MHz), whereas the second one fulfills the illumination functionality by ensuring a certain biasing point. The split of the power allows to minimize the power delivered by the fast-response DC-DC power converter. Thus, the efficiency can be maximized for scenarios with changing conditions (i.e., mobile transmitter and/or receiver, presence of mobile obstacles, etc.). In this sense, how the lighting level and the communication signal power affect both the power efficiency and the communication efficiency is deeply analyzed. The implemented prototype achieves an overall efficiency around 90%. In addition, the proposed VLC transmitter is able to reproduce a wide range of digital modulation schemes, including Orthogonal Frequency Division Multiplexing (OFDM).

show abstract

“…A technique that enables the use of a lower switching frequency is reported in [11]. This technique will be noted as Ripple Modulation (RM) and it consists in modulating both the amplitude and the phase of the first switching harmonic of the output voltage ripple in order to reproduce an SCM signal.…”

Section: A Hb-led Drivers Able To Reproduce MCM Schemesmentioning

confidence: 99%

“…As was previously mentioned, the RM technique enables the reproduction of SCM signals by modulating both the amplitude and the phase of the first switching harmonic of the output voltage ripple [11]. The HB-LED driver topology proposed for applying this technique is a two-phase synchronous buck converter with M th order output filter (see Fig.…”

Section: B Operating Principle Of the Rm Techniquementioning

confidence: 99%

Power-Efficient VLC Transmitter Able to Reproduce Multi-Carrier Modulation Schemes by Using the Output Voltage Ripple of the HB-LED Driver

Rodreguez

Lamar

Aller

et al. 2018

2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)

Self Cite

View full text Add to dashboard Cite

Abstract-Visible Light Communication (VLC) consists in using High-Brightness LEDs (HB-LEDs) not only for lighting, but also for transmitting information by changing the light intensity rapidly. One of the most important problems of VLC is that the HB-LED drivers that have been proposed for achieving the highest bit rates offer low power efficiency. The reason is that since these HB-LED drivers must be able to reproduce fast current waveforms, the use of Linear Power Amplifiers (LPAs) has been adopted, which damages the power efficiency of HB-LED lighting. To the author's knowledge, there is only one approach reported in the literature that is able to reproduce the most recommended modulation schemes by using a power efficient HB-LED driver. However, since it is based on the use of pulse-width modulated dc-dc power converters, the required switching frequency is between 3 and 6 times higher than the maximum frequency of the communication signal. As a result, the approach suffers from high switching losses when the highest bandwidths are addressed. A method for reproducing the most recommended modulation schemes by modulating both the amplitude and the phase of the output voltage ripple is presented in this work. The major benefits are the high efficiency, the simplicity and the lower switching frequency required for the implementation. Keywords-Visible Light

show abstract

Reproducing Single-Carrier Digital Modulation Schemes for VLC by Controlling the First Switching Harmonic of the DC–DC Power Converter Output Voltage Ripple

Cited by 39 publications

References 62 publications

Error Rate Analysis of Amplitude-Coherent Detection Over Rician Fading Channels With Receiver Diversity

Error Rate Analysis of Amplitude-Coherent Detection Over Rician Fading Channels With Receiver Diversity

Performance evaluation of a VLC transmitter based on the split of the power

Power-Efficient VLC Transmitter Able to Reproduce Multi-Carrier Modulation Schemes by Using the Output Voltage Ripple of the HB-LED Driver

Contact Info

Product

Resources

About