[논문]A Hybrid PAPR Reduction Scheme for Optical Wireless OFDM Communication Systems

Abdulkafi, Ayad Atiyah; Alias, Mohamad Yusoff; Hussein, Yaseein Soubhi; Omar, Nazaruddin; Salleh, Mohd Kamarulzamin Bin

doi:10.3837/tiis.2018.03.009

A Hybrid PAPR Reduction Scheme for Optical Wireless OFDM Communication Systems 원문보기

KSII Transactions on internet and information systems : TIIS, v.12 no.3, 2018년, pp.1136 - 1151

Abdulkafi, Ayad Atiyah (Faculty of Engineering, Multimedia University, Persiaran Multimedia) , Alias, Mohamad Yusoff (Faculty of Engineering, Multimedia University, Persiaran Multimedia) , Hussein, Yaseein Soubhi (Faculty of Engineering, Multimedia University, Persiaran Multimedia) , Omar, Nazaruddin (TM Research & Development Sdn Bhd, Innovation Center) , Salleh, Mohd Kamarulzamin Bin (TM Research & Development Sdn Bhd, Innovation Center)

Abstract ▼ AI-Helper

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.

주제어

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문제 정의

In this paper, a new PAPR reduction method for an optical OFDM-based VLC system is developed. ACO-OFDM and DCO-OFDM transmission schemes are compared in terms of PAPR and error rate performance.
Our recent works [4]-[5] have discussed the implementation of indoor VLC systems using a direct current-biased optical OFDM (DCO-OFDM) scheme [4] and proposed a new transmission approach for OFDM based VLC in order to increases the bandwidth efficiency [5]. The present work is dedicated to investigate the possible reduction of the PAPR for asymmetrically clipped optical OFDM (ACO-OFDM). The rest of the paper is organized as follows.
This is possible because the OFDM signal is generated in such a way that the positive part is an anti-symmetrical copy of the negative part [21]. This paper mainly focuses on the performance analysis of the VLC system based on ACO-OFDM taking into account its special time domain structure and its better power efficiency when compared to the previous approach.

제안 방법

In order to make a fair comparsion between ACO-OFDM and DCO-OFDM, simulations have been performed with the same size of IFFT and same M-QAM i.e. IFFT size is 64 and 16-QAM is used for signal modulation for both optical OFDM formats. Fig.
This paper proposes a new and hybrid scheme for reducing the PAPR of OFDM signals in VLC system using combined PTS and signal clipping techniques. In the proposed hybrid scheme, the PTS method is modified to be suitable for VLC transmission and then combined with signal clipping method for further improvements in both the PAPR reduction and BER performance of the VLC system.
This paper proposes a new and hybrid scheme for reducing the PAPR of OFDM signals in VLC system using combined PTS and signal clipping techniques. In the proposed hybrid scheme, the PTS method is modified to be suitable for VLC transmission and then combined with signal clipping method for further improvements in both the PAPR reduction and BER performance of the VLC system.

성능/효과

It is worth to mention that, a higher CR corresponds a higher threshold, and hence, the effect of PAPR reduction gets worse, and vise versa. According to the cumulative signal processing and the modifications proposed, the resulting ACO-OFDM signal is ready to be transmitted through LED and would enable the reduction of PAPR significantly as well as improves the BER performance. Due to the background light, the shot noise is assumed to be the dominant source of noise and has been modeled as an additive white Gaussian noise (AWGN) in the simulation.
For ACO- OFDM based VLC system, a PAPR reduction gain of about 8 dB can be obtained using the proposed hybrid scheme when compared with the basic ACO- OFDM signal at a CCDF of 10⁻¹. Comparing with other methods, the PAPR reduction gain of the proposed method is about 5.5 dB and 1 dB compare to the signal clipping and the modified PTS method, respectively. The corresponding BER values at 10 dB SNR are approximately 10^-1.
Not surprisingly, the system with signal clipping case shows worse BER performance. From the analysis above, it can be concluded that the hybrid scheme provides high PAPR reduction and also good BER performance in VLC system that based on ACO-OFDM and outperforms the other methods in terms of both the PAPR reduction and the BER performance.
8. It can be seen that the original ACO-OFDM signal has a better BER performance in compare with the original DCO-OFDM signal at lower SNR values due to its power efficiency. Meanwhile, for higher SNR values (beyond 13 dB in Figure 8), DCO-OFDM outperforms ACO-OFDM because of spectral efficiency.
93 for the hybrid scheme, modified PTS, clipping method and original ACO-OFDM signals, respectively. Moreover, at the expense of half spectral efficiency, it can be concluded that ACO-OFDM has about 2.5 dB better performance than DCO-OFDM at BER of 10⁻³ when using the PTS and hybrid schemes while it shows a better BER performance than DCO-OFDM for a corresponding clipping scenario over the entire SNR region. Future works will involve the channel estimation methods for further BER improvement along with development of an experimental testbed by mixing real optical front-end and simulated digital modems to support our simulations.
Clearly, about 8 dB PAPR reduction gain is obtained from the proposed hybrid scheme when compared with the basic ACO- OFDM signal at a CCDF of 10⁻¹. The PAPR reduction gain of the proposed method is about 5.5 dB and 1 dB compare to the signal clipping (with CR of 5.5 dB) and the modified PTS method, respectively.

후속연구

5 dB better performance than DCO-OFDM at BER of 10⁻³ when using the PTS and hybrid schemes while it shows a better BER performance than DCO-OFDM for a corresponding clipping scenario over the entire SNR region. Future works will involve the channel estimation methods for further BER improvement along with development of an experimental testbed by mixing real optical front-end and simulated digital modems to support our simulations.

참고문헌 (24)

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상세보기
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상세보기
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상세보기
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표제어: PCR

동의어: Packet Collision Rate

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