Performance analysis of layered ACO-OFDM

Abstract

Layered asymmetrically clipped optical orthogonal frequency division multiplexing (LACO-OFDM) has been proposed for improving the spectral efficiency of conventional asymmetrically clipped optical OFDM (ACO-OFDM). Multiple base layers that are orthogonal in the frequency domain are sequentially superimposed to form LACO-OFDM, where each superimposed layer fills the empty subcarriers left by the previous layer. As our contribution, the bit error ratio (BER) considering the effect of thermal noise, clipping distortion, inter-layer interference and the bit rate difference between layers is analysed in this paper. Since the BER performance of LACO-OFDM is closely related to its peak-to-average power ratio (PAPR) distribution, we also provide the analytical expression of the PAPR distribution in this paper, which quantifies how the number of layers in LACOOFDM reduces the PAPR. As a further advance, we propose a tone-injection aided PAPR reduction design for LACO-OFDM, which in turn improves the BER performance. Simulations are provided for verifying both the analytical BER performance and the PAPR distribution of LACO-OFDM. The results show that the expressions derived match well with the simulations. Furthermore, the PAPR reduction method proposed attains a 5 dB PAPR reduction at the 10^-3 probability-point of the complementary cumulative distribution function (CCDF), as well as a better BER performance than the original LACO-OFDM scheme.

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Identifiers

ORCID for Xiaoyu Zhang: orcid.org/0000-0002-0793-889X

ORCID for Qi Wang: orcid.org/0000-0003-2645-5807

ORCID for Lajos Hanzo: orcid.org/0000-0002-2636-5214

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