Spectrally efficient multicarrier modulation system for visible light communication

Deepa, T.; Mathur, Harshita; Sunitha, K. A.

doi:10.11591/ijece.v9i2.pp1184-1190

Cited by 8 publications

(7 citation statements)

References 9 publications

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“…The complex time signal can be expressed precisely in (5). This technique is applied after P/S block.…”

Section: Figure 2 New Dco-fbmc Optical Transmitter Block Diagrammentioning

confidence: 99%

“…One of the most common problems facing this VLC is the limited bandwidth modulation, so the trend is to use highly efficient modulation systems, to overcome this problem, many modulation schems were used, and the most prominent of which is the OFDM technique in VLC [5]. The transmitted signal must be real to achieve this is used Hermitian-symmetry [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…OFDM schemes such as DC bias optical OFDM (DCO-OFDM), and the other types of schemes each scheme has its pros and cons [8,9]. Researches has found that OFDM suffers from limited bandwidth due to the presence of CP OFDM suffers from leakage spectrum because of its large side lobes [5]. As in RF communication system, FBMC was considered a strong competitor to OFDM, in the fact, FBMC is a candidate waveform for 5G [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Low complexity DCO-FBMC visible light communication system

Qasim¹,

Abdullah²,

Talib³

et al. 2020

IJECE

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Filter Bank Multicarrier (FBMC) is a new waveform candidate in the visible light communication system (VLC). FBMC is a distinctive kind of multi-carrier modulation that can be regarded as an alternative to orthogonal frequency Division Multicarrier (OFDM) with CP (cyclic prefix). DCO-FBMC (DC-bias optical FBMC) has recently been used in VLC, because it overcomes all defects in the optical-OFDM system and has high spectral efficiency. But at the same time the traditional DCO-FBMC suffers from high complexity due to the use of Hermitian Symmetry for real signal, by using 2Npoint subcarrier IFFT (Inverse Fast Fourier Transformer) in the modulator, and the output is N-point subcarrier FFT (Fast Fourier Transform) in the demodulator. In this paper, for the first time, the possibility of minimizing complexity and generating a real signal without the use of Hermitian Symmetry or any other technique has been verified. The proposed technology provides 50% of the size of the IFFT / FFT and this results in a significant reduction in power consumption and occupied chip area.

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“…The complex time signal can be expressed precisely in (5). This technique is applied after P/S block.…”

Section: Figure 2 New Dco-fbmc Optical Transmitter Block Diagrammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low complexity DCO-FBMC visible light communication system

Qasim¹,

Abdullah²,

Talib³

et al. 2020

IJECE

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“…The results of this study indicate that VLC can be applied on the road and send information with a maximum distance of 1.5 m. In 2015, a study conducted by Azka et al [7] tried to transmit digital data in the form of files using the VLC system, this tool can communicate at a maximum distance of 30 cm between the transmitter and receiver at an angle of 0° and a range of 10 cm without interference from other objects. Other researches were done by Fuada et al [8], Deepa et al [9], and Qasin et al [10] that analyze VLC technology that will be used for those systems. Besides that, this technology has been implemented and applied indoors [11][12][13][14][15][16][17][18], underwater [19][20][21][22][23], vehicular [24], and internet network [25].…”

Section: Introductionmentioning

confidence: 99%

Light follower systems for visually impaired using visible light communication

2020

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Visual impairment is the condition of someone who has a disorder or an obstacle in their vision. In this research, the implementation of light follower systems for visually impaired using visible light is proposed. This system can enable visually impaired people to determine orientation and support mobility, especially in an indoor situation, using visible light. The prototype of the visually impaired pathway was made as visible light communication (VLC) transmitter consisting of a 12 V power supply, light emitting diode (LED), MPEG-1 Layer-3 (MP3), and band pass filter (BPF) filter circuit. The VLC receiver is made a prototype of a blind stick consisting of a photodiode, amplifier, buzzer, timer, and 9 V battery. The measurement of this system uses acrylic and color filters with system accuracy taking into account the angle and conditions when the fluorescent lights are turned on and off. This result showed the system could transmit audio signals at a frequency of 3000 Hz. Furthermore, the comparison results showed that the quality of measurements without using a filter is better than using a filter. The output voltage value without using a filter with an angle of 700 degree is 7.19 Vp-p, meanwhile using a filter with an angle of 700 degree is 6.48 Vp-p.

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“…Progress in modern telecommunication systems is connected with using complicated signal and code structures to form information signals [1][2][3][4][5]. Thus both phase locked loop (PLL), which recovers signal carrier frequency and clock synchronization devices (CSD) are needed to be included to the receiving part.…”

Section: Introductionmentioning

confidence: 99%

Signal processing with frequency and phase shift keying modulation in telecommunications

Boiko¹,

Tolubko²,

Барабаш³

et al. 2019

TELKOMNIKA

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In this paper represents research improving effectiveness of signal processing in telecommunication devices especially for its part, which relates to providing its noise resistance in conditions of noise and interference. This objective has been achieved through development of methods and means for optimization of filtering devices and semigraphical interpretation of clock synchronization systems in telecommunications with frequency shift keying on the base of stochastic models what determines relevance of the subject. Separately, in an article considered the urgent task is using of modified synchronization methods based on the interference influence of adjacent symbols on the phase criterion tract, in particular the use of the modified synchronization scheme, in order to get a formalized outlook representation of the synchronization schemas based on the polyphase structures with using a bank of filters, that allows to improve the characteristics of digital telecommunication channels. This work is devoted to the examination and modeling of these ways. The proposed ideas and results for the construction of synchronization systems can be used in modern means of telecommunication.

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Spectrally efficient multicarrier modulation system for visible light communication

Cited by 8 publications

References 9 publications

Low complexity DCO-FBMC visible light communication system

Low complexity DCO-FBMC visible light communication system

Light follower systems for visually impaired using visible light communication

Signal processing with frequency and phase shift keying modulation in telecommunications

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