Performance analysis of DCO-OFDM in VLC system

Abdulkafi, Ayad Atiyah; Alias, Mohamad Yusoff; Hussein, Yaseein Soubhi

doi:10.1109/micc.2015.7725427

Cited by 37 publications

(33 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Satu simbol OFDM membawa satu set simbol data yang didefinisikan X pada domain frekuensi. Simbol OFDM merupakan vektor yang terdiri atas subpembawa N/2 [5]. Seperti pada Gbr.…”

Section: Desain Sistem Ofdm Merupakan Teknik Penjamakan (Multiplunclassified

“…5, sinyal yang masuk ke Hermitian merupakan hasil perkalian dengan fase yang berbeda, yang nilai fase tersebut telah didefinisikan pada (2) untuk CSLM dan (7) untuk SSLM. Hasil dari matriks simetris Hermitian membuat keluaran dari IFFT menjadi sebesar N [5].…”

Section: Matriks Simetris Hermitianunclassified

“…Beberapa kasus penerapan OFDM mengharuskan sinyal yang dikirim bernilai real, yang salah satunya terdapat pada penerapan komunikasi melalui cahaya. Agar sinyal pada output IFFT menjadi real, setelah sinyal dipetakan (proses mapping), matriks simetris Hermitian digunakan untuk membuat sinyal menjadi real [5].…”

unclassified

See 2 more Smart Citations

Perbandingan PAPR Metode CSLM dan SSLM pada Pengirim OFDM

Nuriadnyana

Fahmi

Syihabuddin

2019

Jurnal Nasional Teknik Elektro dan Teknologi Informasi

View full text Add to dashboard Cite

OFDM has multiple weaknesses, one of which is a high Peak to Power Average (PAPR). The maximum power value of the OFDM signal will be much greater than the average power, so the efficiency of the amplifier will be reduced. A popular and effective method to reduce PAPR values is by using Conventional Selected Mapping (CSLM). The CSLM method utilizes the PAPR sensitivity to phase rotation by multiplying the signal that will enter IFFT against different phase rotations and then selects the signal with the lowest PAPR. However, to detect the signal to be selected, the CSLM method requires Side Information (SI) transmission. The method called Symmetric Selected Mapping (SSLM) has been introduced to reduce PAPR values in DCO-OFDM systems without sacrificing bandwidth efficiency caused by SI transmission. The technique on SSLM multiplies signals that will be sent with additional magnitude and different phase rotations. This paper designs OFDM transmitters using Hermitian Symmetry and then analyzes the results of PAPR value reduction using SSLM and CSLM methods. The simulation results show that the PAPR value using CSLM and SSLM methods can reduce PAPR by 3.08 and 3.04 dB. Intisari-OFDM memiliki kelemahan, salah satunya adalah Peak to Power Average (PAPR) yang tinggi. Nilai daya maksimum sinyal OFDM jauh lebih besar dibandingkan daya rata-ratanya, sehingga efisiensi amplifier menjadi berkurang. Salah satu metode efektif yang telah banyak digunakan untuk mereduksi nilai PAPR adalah Conventional Selected Mapping (CSLM). Metode CSLM memanfaatkan sensitivitas PAPR terhadap rotasi fase dengan mengalikan sinyal yang akan masuk ke IFFT terhadap rotasi fase yang berbeda lalu memilih sinyal dengan nilai PAPR yang terendah. Namun, untuk mendeteksi sinyal yang akan dipilih, metode CSLM membutuhkan transmisi Side Information (SI). Metode yang dinamakan Symmetric Selected Mapping (SSLM) telah diperkenalkan untuk mereduksi nilai PAPR di sistem DCO-OFDM tanpa mengorbankan efisiensi lebar bidang (bandwith) yang disebabkan oleh transmisi SI. Teknik pada SSLM mengalikan sinyal yang akan dikirim dengan magnitude tambahan dan rotasi fase yang berbeda. Makalah ini mendesain pengirim OFDM dengan menggunakan matriks simetris Hermitian, lalu menganalisis hasil reduksi nilai PAPR dengan metode SSLM dan CSLM. Dari hasil simulasi didapatkan nilai PAPR menggunakan CSLM dan SSLM dapat mereduksi PAPR sebesar 3,08 dan 3,04 dB.

show abstract

“…Satu simbol OFDM membawa satu set simbol data yang didefinisikan X pada domain frekuensi. Simbol OFDM merupakan vektor yang terdiri atas subpembawa N/2 [5]. Seperti pada Gbr.…”

Section: Desain Sistem Ofdm Merupakan Teknik Penjamakan (Multiplunclassified

Section: Matriks Simetris Hermitianunclassified

See 1 more Smart Citation

Perbandingan PAPR Metode CSLM dan SSLM pada Pengirim OFDM

Nuriadnyana

Fahmi

Syihabuddin

2019

Jurnal Nasional Teknik Elektro dan Teknologi Informasi

View full text Add to dashboard Cite

show abstract

“…The addition of a constant DC-bias current results in a high-power requirement [2]. Further details on the DCO-OFDM performance in VLC system can be found in [20]. Nevertheless, for indoor VLC systems that are designed for lighting applications, this power constraint is not very significant as the constant DC-bias current is regardless required to provide a constant level of room illumination.…”

Section: Optical Ofdm Approachesmentioning

confidence: 99%

A Hybrid PAPR Reduction Scheme for Optical Wireless OFDM Communication Systems

2018

KSII TIIS

View full text Add to dashboard Cite

This paper proposes a new hybrid scheme to decrease the high peak to average power ratio (PAPR) of optical orthogonal frequency division multiplexing (OFDM) signals in visible light communication (VLC) systems. The PAPR causes nonlinear signal distortions and high power requirements for the VLC transmitter (light emitting diode, LED). The proposed method is applicable for both direct current-biased optical OFDM (DCO-OFDM) and asymmetrically clipped optical OFDM (ACO-OFDM). In the proposed scheme, the PTS method is firstly modified to fit both optical OFDM approaches transmission and then combined with signal clipping method for further PAPR reduction and bit error rate (BER) improvement of the VLC system. The performance of hybrid scheme has been evaluated and compared with the original OFDM based VLC system, conventional PTS and clipping methods. The results show that the hybrid scheme outperforms other methods in terms of both the PAPR reduction and BER performance.

show abstract

“…According to Fourier transforms properties, for traditional OFDM, if the discrete input sequence of the modulator has its first and center coefficients null, and if it presents Hermitian symmetry with respect to its center, then the OFDM time modulated signal is real [12], while existing an OFDM instituted modulation, FBMC inherits from many features related to traditional OFDM systems [13]. Nevertheless, the Hermitian symmetry of the frequency symbols ends in a duplicated size of FFT/IFFT components [14]. Consequently, to modulate N frequency symbols, 2N-point IFFT/FFT transforms are required [15].…”

mentioning

confidence: 99%

Low complexity DCO-FBMC visible light communication system

Qasim¹,

Abdullah²,

Talib³

et al. 2020

IJECE

View full text Add to dashboard Cite

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.

show abstract

Performance analysis of DCO-OFDM in VLC system

Cited by 37 publications

References 11 publications

Perbandingan PAPR Metode CSLM dan SSLM pada Pengirim OFDM

Perbandingan PAPR Metode CSLM dan SSLM pada Pengirim OFDM

A Hybrid PAPR Reduction Scheme for Optical Wireless OFDM Communication Systems

Low complexity DCO-FBMC visible light communication system

Contact Info

Product

Resources

About