A combinding PAPR reduction method for DCO-OFDM UOWC

Optical orthogonal frequency division multiplexing (OFDM) has been adopted in underwater optical wireless communication (UOWC) system, to achieve high data rate and huge bandwidth, as well as to deal with the problem of inter symbol interference. However, it has the problem of high peak-to-average power ratio (PAPR) which will result in serious performance deterioration and increase equipment costs. In this paper, an SLM method is combined with μ-law companding method to reduce the PAPR of UOWC system, which reduce the signal PAPR by 6.8dB and is superior than both the traditional SLM and μ-law companding methods. As for the system bit error rate (BER), the proposed method has better performance than the μ-law companding method. With reasonable tradeoff with the BER, the proposed method has faster convergence than the traditional SLM method.