Abstract
In this paper, we propose a low-complexity peak-to-average power ratio (PAPR) reduction scheme that combines both multi-band (MB)-Hadamard precoding and clipping for the optical orthogonal frequency division multiplexing (OFDM) systems. Approximations of PAPR distribution for baseband OFDM signals are analyzed and the effective signal-to-noise ratio (SNR) of the whole transmission link considering both the clipping and quantization noise are presented. After that, the MB-Hadamard precoding is adopted to compresses the peak signals, minimizing the contaminating influence of signal distortions in subsequent clipping operations. In addition, the received SNRs and bit error rate (BER) are calculated theoretically for each split sub-band. The 50-m step-index polymer optical fiber (POF) transmission is adopted as a special case to both evaluate the system performance and then compare the proposed scheme with other well-known PAPR reduction techniques. With this scheme, the PAPR is reduced effectively and the system’s BER performance is improved significantly. The results show that the proposed scheme with appropriate number of sub-bands precoding provides favorable trade-offs among PAPR reduction, power spectral density, transmission rate, BER, and computational complexity, which demonstrates its feasibility and validity.
Highlights
Orthogonal frequency division multiplexing (OFDM) is regarded as a promising modulation candidate for optical wireless communication (OWC) and polymer optical fiber (POF) as it provides a high data rate, high spectral efficiency, and high tolerance to multi-path interference [1,2]
The results show that the proposed scheme with appropriate number of sub-bands precoding provides favorable trade-offs among peak-to-average power ratio (PAPR) reduction, power spectral density, transmission rate, bit error rate (BER), and computational complexity, which demonstrates its feasibility and validity
The discrete multi-tone (DMT) suffers from a high peak-to-average power ratio (PAPR) and is more susceptible to nonlinear distortions
Summary
Orthogonal frequency division multiplexing (OFDM) is regarded as a promising modulation candidate for optical wireless communication (OWC) and polymer optical fiber (POF) as it provides a high data rate, high spectral efficiency, and high tolerance to multi-path interference [1,2]. Clipping, filtering and companding are well-known varieties of signal distortion schemes that directly limit the peak envelope of the transmitting signals to a desired value [13,14,15] These signal processing schemes result in both in-band distortion and out-of-band high frequency components, which further degrades the bit error rate (BER) performance and reduces the spectral efficiency. An efficient low-complexity PAPR reduction scheme combining both multi-band (MB)-Hadamard precoding and clipping is proposed in DMT systems. The results demonstrated that the proposed scheme reduces the PAPR significantly and improves the BER performance effectively It matches well with the bit-loading technique to enhance the system capacity. Let N μ, σ2 denotes the Gaussian distribution with a mean of μ and a variance of σ2
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