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Performance of multilevel differential polarization shift keying with estimation of inclined polarization axes over atmospheric turbulence channel

机译：大气湍流通道上偏极化轴估计的多级差分极化移位键控性能

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Multilevel polarization shift keying (MPolSK) is an optical modulation scheme, in which the state of polarization changes according to transmission data. When either the transmitter or the receiver is not fixed, the mismatched polarization axes is caused. It significantly degrades the communication performance. To overcome this problem multilevel differential PolSK (MDPolSK) was proposed, in which we perform differential encoding on a pair of successive transmission symbols. Because the decoding process needs two successive symbols and they are affected by independent noises, MDPolSK is sensitive to noises. In this paper, to reduce the noise influence in MDPolSK, we propose a method to estimate the inclined polarization axes. By using the estimation method the symbol error rate (SER) of MDPolSK can approach that of MPolSK, even in the case of the mismatched polarization axes. In addition, we study the intensity fluctuation caused by the atmospheric turbulence channel and show its influence on the SER of MDPolSK. The intensity fluctuation is modeled by the lognormal distribution.
机译：多级偏振移位键控（MPolSK）是一种光学调制方案，其中偏振状态根据传输数据而变化。当发送器或接收器都不固定时，会导致偏振轴不匹配。这会大大降低通信性能。为了克服这个问题，提出了多级差分PolSK（MDPolSK），其中我们对一对连续的传输符号执行差分编码。因为解码过程需要两个连续的符号，并且它们受到独立噪声的影响，所以MDPolSK对噪声很敏感。在本文中，为了减少MDPolSK中的噪声影响，我们提出了一种估计倾斜偏振轴的方法。通过使用估计方法，即使在偏振轴不匹配的情况下，MDPolSK的符号错误率（SER）也可以接近MPolSK的错误率。此外，我们研究了由大气湍流通道引起的强度波动，并显示了其对MDPolSK SER的影响。强度波动通过对数正态分布建模。

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