研究目的
To reduce the peak-to-average power ratio (PAPR) in underwater optical wireless communication (UOWC) systems using optical orthogonal frequency division multiplexing (O-OFDM) by combining selective mapping (SLM) and μ-law companding methods.
研究成果
The combined SLM and μ-law companding method effectively reduces PAPR by 6.8dB compared to the original OFDM signal, outperforming traditional SLM and companding methods individually. It offers faster convergence and better BER performance than companding alone, making it a viable approach for UOWC systems with a reasonable trade-off between PAPR reduction and BER.
研究不足
The paper does not explicitly discuss limitations, but potential constraints may include the complexity of the combined method, reliance on simulations without real-world testing, and sensitivity to parameters like μ value and number of subcarriers, which could affect practical implementation and optimization.
1：Experimental Design and Method Selection:
The study combines SLM and μ-law companding methods to reduce PAPR in UOWC systems. SLM involves copying the OFDM input signal into multiple groups with different phase factors to select the one with the lowest PAPR, while μ-law companding amplifies small signals and compresses large signals. The proposed method integrates both to achieve better PAPR reduction with faster convergence.
2：Sample Selection and Data Sources:
Simulations are conducted using QPSK modulation with 1024 subcarriers and 1000 OFDM signals. Blue-green laser is selected for transmission in seawater channels, based on its lower attenuation properties.
3：List of Experimental Equipment and Materials:
Not explicitly detailed in the paper; simulations likely use computational tools for modeling UOWC systems, but specific equipment is not mentioned.
4：Experimental Procedures and Operational Workflow:
The process includes data mapping to QPSK, applying SLM with phase factors, performing IFFT, selecting the signal with minimum PAPR, applying μ-law companding, and transmitting through the UOWC channel. At the receiver, inverse operations are performed for signal recovery.
5：Data Analysis Methods:
PAPR is calculated using the formula PAPR(dB) = 10log10(max{|xn|^2} / E{|xn|^2}), and complementary cumulative distribution function (CCDF) is used to evaluate the probability of PAPR exceeding a threshold. Bit error rate (BER) is analyzed to assess performance trade-offs.
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