Cubic Metric Reduction for DCO-OFDM Visible Light Communication Systems

Doblado, J.G.; Oria, Ana Cinta Oria; Baena-Lecuyer, V.; López, P.; Pérez-Calderón, Darío

doi:10.1109/jlt.2015.2402755

Cited by 27 publications

(8 citation statements)

References 16 publications

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“…The probability of the PAPR being higher than a certain threshold level (i.e., PAPR 0 ) are illustrated in Figs. 7 and 8 where, as in [32][33][34], a complementary cumulative distribution function (CCDF) of 10 −4 , i.e. {PAPR > PAPR 0 } = 0.0001, is considered.…”

Section: U-pam-fdm Rxmentioning

confidence: 99%

Unipolar-pulse amplitude modulation frequency division multiplexing for visible light communication systems

Saied¹,

Ghassemlooy

Zvánovec

et al. 2020

Opt. Eng.

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Asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) has been proposed in visible light communication (VLC) systems to overcome the DC-biased optical OFDM (DC-OFDM) power consumption issue at the cost of the available electrical spectral efficiency. Due to the implementation of inverse fast Fourier transform (IFFT), all the optical OFDM schemes including ACO-OFDM suffer from large peck to average power ratio (PAPR), which degrade the performance in VLC systems as the light emitting diodes used as the transmitter have a limited optical power-current linear range. To address the PAPR issue in ACO-OFDM, in this work we introduce a unipolar-pulse amplitude modulation frequency division multiplexing (U-PAM-FDM) by adopting the single carrier frequency division multiple access (SC-FDMA). This is achieved by considering a PAM as an SC-FDMA data symbols and inserting a conjugate copy of the middle and first SC-FDMA FFT output subcarriers after the middle and last subcarriers, respectively. Simulation results show that, for the proposed scheme the PAPR is 3.6 dB lower compared with ACO-OFDM. The PAPR improvement is further analyzed with the simulation results demonstrating that the proposed scheme offers 2.5 dB more average transmitted power compared to ACO-OFDM.

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Section: U-pam-fdm Rxmentioning

confidence: 99%

Unipolar-pulse amplitude modulation frequency division multiplexing for visible light communication systems

Saied¹,

Ghassemlooy

Zvánovec

et al. 2020

Opt. Eng.

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show abstract

“…Consequently, various techniques have been proposed in literature to overcome this issue such as signal clipping, precoding, selective mapping (SLM) and partial transmit sequence (PTS) techniques. PAPR reduction of VLC-OFDM signals via signal clipping is straightforward and widely used in the literatures due to its simplicity [3]- [8]. Clipping performed by removing the high-power peaks of the signal, without changing its phase by multiplying the signal by a predetermined threshold.…”

Section: Related Workmentioning

confidence: 99%

A Hybrid PAPR Reduction Scheme for Optical Wireless OFDM Communication Systems

2018

KSII TIIS

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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.

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“… Cubic Metric [27] and, in our case, Raw Cubic Metric (RCM), is a good criterion for quantifying the power de-rating of the PA when driven by (OFDM) modulated signals, as suggested in 3GPP framework.…”

Section: Analysis Of Signals Characteristicsmentioning

confidence: 99%

Envelope Factorization with Partial Elimination and Recombination, EF-PER, a New Linear RF Architecture

Baudoin¹,

Diet²,

Lasaulce³

2015

RADIOENGINEERING

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In this paper, a new architecture for efficient linear radio frequency transmitters is proposed; it includes envelope-tracking (ET) and envelope-elimination-andrestoration (EER) architectures as special instances. The proposed technique is referred to as Envelope Factorization with Partial Elimination and Recombination (EF-PER). It relies on a decomposition of the RF signal before power amplification as a product of two signals, one of them being the envelope signal elevated to an exponent "α". Compared to ET or EER architectures, the parameter "α" constitutes a new degree of freedom. This allows one to realize good tradeoffs between different performance criteria such as spectrum use, power efficiency, and transmitter linearity. An intuitive aggregate cost function is introduced to capture the desired tradeoff and turns out to be maximized in α = 0.5. The full relevance of EF-PER is sustained both by analytical results and realistic simulations performed for OFDM signals. The EF-PER architecture (with α = 0.5) has been simulated under Agilent-ADS with a non-linear transistor model from Avago (E-PHEMT) and compared with ET and EER.

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Cubic Metric Reduction for DCO-OFDM Visible Light Communication Systems

Cited by 27 publications

References 16 publications

Unipolar-pulse amplitude modulation frequency division multiplexing for visible light communication systems

Unipolar-pulse amplitude modulation frequency division multiplexing for visible light communication systems

A Hybrid PAPR Reduction Scheme for Optical Wireless OFDM Communication Systems

Envelope Factorization with Partial Elimination and Recombination, EF-PER, a New Linear RF Architecture

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