Exact BEP Analysis for Coherent M-ary PAM and QAM over AWGN and Rayleigh Fading Channels

In this paper, we propose an EADO-OFDM (Enhanced Asymmetrically Clipped DC Biased Optical Orthogonal Frequency Division Multiplexing) method for IM/DD (Intensity-Modulated DirectDetection) optical systems, in which the AV-DCO-OFDM (Absolute Valued DC Biased Optical OFDM) symbols on the even subcarriers and ACO-OFDM (Asymmetrically Clipped Optical OFDM) symbols on the odd subcarriers are combined for simultaneous transmission. Moreover, we discuss the PDF (Probability Density Function) and electrical SNR (Signal to Noise Ratio) of the symbols, which are utilized to estimate the BER (Bit Error Ratio) performance and overall performance of EADO-OFDM. The Monte Carlo simulation results have validated the theoretical analysis and have also confirmed the EADO-OFDM is attractive considering the following benefits. Firstly, EADO-OFDM is more energy efficient compared to the power-efficient DCO-OFDM (DC Biased Optical OFDM), since the required DC bias is smaller when appropriate constellation size combinations are chosen. In addition, EADO-OFDM performs better than the conventional ADO-OFDM (Asymmetrically Clipped DC Biased Optical OFDM), because the absolute value operation causes no clipping distortion.

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“…Therefore, we simply assume all the layers have the same absolute beta values as in (15). P b (l) is the BER of the Layer l ACO-OFDM signals in the DO-OFDM, which can be approximated by [33] …”

Section: Proposed Dimmable Vlc System Based On Multi-layer Aco-ofdmmentioning

confidence: 99%

Dimmable Visible Light Communications Based on Multilayer ACO-OFDM

et al. 2016

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This paper proposes a dimmable scheme for visible light communication (VLC) system based on multi-layer asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM), which is able to support a wide dimming range for different illumination requirements. In the proposed scheme, multiple layers of ACO-OFDM occupying different subcarriers are combined so that almost all the subcarriers can be used for data transmission. The polarities of different layers of ACO-OFDM are varied to obtain flexible time-domain waveform, which can fully exploit the dynamic range of LEDs and achieve better performance. The scaling factor and modulation order for each layer as well as the DC bias are optimized for different dimming requirements to achieve improved spectral efficiency. Simulation results demonstrate that the proposed scheme can support communication over a wide dimming range and achieve higher spectral efficiency compared with existing methods under different dimming requirements.

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Exact BEP Analysis for Coherent M-ary PAM and QAM over AWGN and Rayleigh Fading Channels

Cited by 28 publications

References 15 publications

Iterative receiver for ADO-OFDM with near-optimal optical power allocation

Iterative receiver for ADO-OFDM with near-optimal optical power allocation

Enhanced asymmetrically clipped DC biased optical OFDM for intensity-modulated direct-detection systems

Dimmable Visible Light Communications Based on Multilayer ACO-OFDM

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