摘要
Active constellation expansion(ACE) and iterative clipping and filtering(ICF) are simple and effective techniques for reducing the peak-to-average ratio(PAPR) in coherent optical orthogonal frequency division multiplexing(CO-OFDM) systems, but effective PAPR suppression requires a lot of iterations. To overcome this shortcoming, a joint algorithm based on improved active constellation expansion(IACE) and ICF(IACE-ICF) is proposed. The simulation results show that at the complementary cumulative distribution function(CCDF) of 10-4, the PAPR of IACE-ICF(G=4, iter=4) algorithm is optimized by 1.507 d B, 1.13 d B and 0.204 d B compared with that of the IACE, ICF(iter=4) and ICF-IACE(G=4, iter=4) algorithms, respectively. Meanwhile, when the bit error rate(BER) is 10-3, the optical signal to noise ratio(OSNR) of the proposed scheme is optimized by 2.04 d B, 1.75 d B and 1.4 d B compared with that of clipping, ICF(iter=4) and ICF-IACE(G=4, iter=4) algorithms, respectively. On the other hand, the proposed scheme can reduce the number of complex multiplications by 14.29% and complex additions by 28.57% compared with the ICF(iter=14) scheme.
作者
李婷婷
童峥嵘
张卫华
刘叶
LI Ting-ting;TONG Zheng-rong;ZHANG Wei-hua;LIU-Ye(Engineering Research Center of Optoelectronic Devices and Communication Technology,Minislty of Education,Tianjin Key Laboratory of Film Electronic and Communication Devices,School of Electrical and Electronic Engineering,Tianjin University of Technology,Tianjin 300384,China)
基金
supported by the Natural Science Foundation of Tianjin(No.18JCYBJC86300)。