LAUSR

In this paper, a hybrid technique using a low complexity selective mapping (LCSLM) cascading an improved μ law companding scheme (LCSLM- μ ) is proposed to reduce the peak-to-average power ratio (PAPR) and complexity in coherent optical orthogonal frequency division multiplexing system. The simulation results show that at the complementary cumulative distribution function of $${10}^{{ - 4}}$$ 10 - 4 , the PAPRs of the scheme LCSLM- μ ( D  = 4,m = 3, $$\mu { = 1}$$ μ = 1 ) are optimized by 1.488 dB and 1.166 dB compared those of LCSLM ( D  = 4) and companding( $$\mu { = 1}$$ μ = 1 ) schemes, respectively. Meanwhile, when the bit error rate (BER) is 10 –3 , the optical signal to noise ratios (OSNRs) of the LCSLM- μ ( D  = 4,m = 3, $$\mu { = 1}$$ μ = 1 ) scheme are optimized by 6.61 dB and 7.31 dB compared with those of companding ( $$\mu { = 1}$$ μ = 1 ) and improved $$\mu$$ μ law companding (m = 3, μ = 1) schemes, respectively. The computational complexity and PAPR reduction performance of various schemes, such as traditional SLM, LCSLM, improved law companding and LCSLM- μ schemes are analyzed respectively. The simulation results show that the LCSLM- $$\mu$$ μ ( D  = 4, m = 3, μ = 1)provides better PAPR reduction performance. When the alternative signal is 16, compared with the traditional SLM algorithm, the LCSLM- $$\mu$$ μ ( D  = 4, m = 3, $$\mu { = 1}$$ μ = 1 ) scheme reduces the computational complexity of complex addition and complex multiplication by 53.1% and 45%, respectively. This paper provides a choice for a trade-off among PAPR reduction, BER and reduced complexity.