In order to solve the problem of coherent optical orthogonal frequency division multiplexing (CO-OFDM) system has a high peak-to-average ratio (PAPR), this paper proposes an iterative inversion partial transmit sequence (IPTS) companding new algorithm that combined with companding algorithm. CO-OFDM simulation experiments show that the algorithm in the iterative companding coefficient m=3, sub block parti-tion number V=4, companding coefficient μ=2, the complementary cumulative distribution function (CCDF) value was 10-4, compared with the IPTS algorithm and μ-law companding transform, the performance of PA-PR are increased by 3.53dB and 1.21dB. When the bit error rate (BER) is 10-3, the optical signal-to-noise ratio (OSNR) of IPTS companding algorithm (m=3, V=4, and μ=2) increases 2.51dB and 0.58dB respectively compared with IPTS algorithm (V=4) and μ-law companding algorithm (μ=2).%针对相干光正交频分复用(CO-OFDM)系统中存在较高的峰均比(PAPR)问题,提出了一种翻转迭代部分传输序列(IPTS)联合压扩算法的IPTS压扩新算法.通过CO-OFDM系统进行了仿真实验证明,该算法在压扩迭代系数m=3、子块分割数V=4、压扩系数为μ=2,互补累积分布函数(CCDF)值为10-4时,与IPTS算法和μ律压扩变换相比,其PAPR性能分别提高了3.53dB和1.21dB.在误码率(BER)为10-3时, IPTS压扩算法(m=3,V=4,μ=2)所需要的光信噪比(OSNR)比IPTS算法(V=4)和μ律压扩算法(μ=2)分别增加了2.51dB和0.58dB.
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