Average transmit power reduction in OFDM-based indoor wireless optical communications using SLM

Farooqui, Muhammad Zubair; Saengudomlert, Poompat; Kaiser, M. Shamim

doi:10.1109/icelce.2010.5700765

Cited by 15 publications

(20 citation statements)

References 15 publications

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“…RoC-ACO-OFDM: The ACO-OFDM samples are upper clipped by applying the proposed RoC procedure. Other PAPR reduction methods for optical OFDM: SLM in [15], [16] and precoding based method in [20]. Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Finally, in Fig. 12, we also compare the PAPR reduction performance of RoC-ACO-OFDM with other PAPR reduction technologies, including the SLM in [15], [16] and precoding schemes in [20]. In an SLM with R phase sequences, any r th sequence u r has N=4 components and u r ;n represents the nth component of r th phase sequence.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Similarly by applying the symmetry property of the hypotheses, the functions f y uc ;ŷ uc jH 2 ðy 1 ; y 2 Þ, f y uc ;ŷ uc jH 4 ðy 1 ; y 2 Þ and f y uc ;ŷ uc jH 6 ðy 1 ; y 2 Þ can be readily obtained. Now that, given the obtained received value ðy 1 ; y 2 Þ, the transmission detection in (15) can be calculated by using the derived probability functions in (17), (18), and (22). In Fig.…”

Section: Map Detection With Recovery For Roc-aco-ofdmmentioning

confidence: 99%

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ACO-OFDM-Specified Recoverable Upper Clipping With Efficient Detection for Optical Wireless Communications

Zhang

et al. 2014

IEEE Photonics J.

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The high peak-to-average-power ratio (PAPR) of orthogonal frequency-division multiplexing (OFDM) degrades the performance in optical wireless communication systems. This paper proposes a modified asymmetrically clipped optical OFDM (ACO-OFDM) with low PAPR via introducing a recoverable upper-clipping (RoC) procedure. Although some information is clipped by a predetermined peak threshold, the clipped error information is kept and repositioned in our proposed scheme, which is named RoC-ACO-OFDM, instead of simply being dropped in conventional schemes. The proposed method makes full use of the specific structure of ACO-OFDM signals in the time domain, where half of the positions are forced to zeros within an OFDM symbol. The zero-valued positions are utilized to carry the clipped error information. Moreover, we accordingly present an optimal maximum a posteriori (MAP) detection for the RoC-ACO-OFDM system. To facilitate the usage of RoC-ACO-OFDM in practical applications, an efficient detection method is further developed with near-optimal performance. Simulation results show that the proposed RoC-ACO-OFDM achieves a significant PAPR reduction, while maintaining a competitive bit-error rate performance compared with the conventional schemes.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Simulation Resultsmentioning

confidence: 99%

Section: Map Detection With Recovery For Roc-aco-ofdmmentioning

confidence: 99%

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ACO-OFDM-Specified Recoverable Upper Clipping With Efficient Detection for Optical Wireless Communications

Zhang

et al. 2014

IEEE Photonics J.

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“…However, increasing the required transmission bandwidth of VLC system is the main drawback of these techniques. Other methods of signal transformation such as the SLM method for reducing the signal peak values in an optical OFDM system has been studied in [12]- [13]. SLM method can statistically enhance the characteristics of the PAPR distribution of the OFDM signal by transmitting a huge amount of overhead in order to properly demodulate data [14].…”

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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“…Authors in [4] proposed the use of pilot signal in reducing PAPR by rotating the phase of data symbols with randomly generated pilot symbol sequence. This approach is a generalised form of the widely reported selected mapping (SLM) [7] PAPR reduction technique.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Pilot-Assisted PAPR Reduction Technique in Optical OFDM Systems

Ogunkoya

Popoola

Shahrabi

et al. 2015

IEEE Photon. Technol. Lett.

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The pilot-assisted peak-to-average power ratio (PAPR) reduction technique proposed for optical orthogonal frequency division multiplexing (OFDM) communication systems is evaluated empirically and theoretically in this letter. The PAPR reduction is achieved by rotating the phase of data symbols with P iterations of randomly generated pilot symbol sequence. The results of our hardware implementation and analysis show a close agreement to that of computer simulations. In comparison with basic OFDM where no PAPR reduction technique is implemented, experimental PAPR reduction gain of pilot-assisted OFDM (PA-OFDM) at a complementary cumulative distribution function (CCDF) of 10 −3 with P = 5 is about 2 dB. This gain is approximately 0.2 dB less than that of analytical results. The experimental results also show that the pilot-assisted technique does not cause any significant deterioration of the bit error performance.

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Average transmit power reduction in OFDM-based indoor wireless optical communications using SLM

Cited by 15 publications

References 15 publications

ACO-OFDM-Specified Recoverable Upper Clipping With Efficient Detection for Optical Wireless Communications

ACO-OFDM-Specified Recoverable Upper Clipping With Efficient Detection for Optical Wireless Communications

A Hybrid PAPR Reduction Scheme for Optical Wireless OFDM Communication Systems

Performance Evaluation of Pilot-Assisted PAPR Reduction Technique in Optical OFDM Systems

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