Specific gravity sharing nonlinear precoding method for compensating damage of IMDD optical fiber system

Abstract

The invention discloses a proportion sharing nonlinear precoding method for compensating IMDD optical fiber system damage, and the method comprises the steps: obtaining a training symbol through a transmitting end, carrying out the optical fiber channel transmission and signal processing of the training symbol, and obtaining a receiving training sequence; the method comprises the following steps of: carrying out second-order Wollaston feedback equalization processing on a received training sequence to obtain an equalization output sequence, and carrying out truncation processing on the equalization output sequence to obtain a first specific gravity coefficient of second-order Wollaston feedback equalization after truncation processing; and clustering the first specific gravity coefficients to obtain a plurality of second specific gravity coefficients, obtaining a real symbol, and performing specific gravity sharing nonlinear precoding on the real symbol based on the plurality of second specific gravity coefficients. According to the embodiment of the invention, the specific gravity coefficients of the truncated second-order Wollaston feedback equalization are clustered, so that the specific gravity coefficients are further reduced, the complexity of the specific gravity sharing nonlinear precoding method is reduced by adopting clustering, and the cost of an IMDD optical fiber transmission system is further reduced. 本发明公开了补偿IMDD光纤系统损伤的比重共享非线性预编码方法，方法包括：通过发送端获取训练符号，并将训练符号经过光纤信道传输和信号处理，得到接收训练序列；将接收训练序列进行二阶沃尔泰拉反馈均衡处理，得到均衡输出序列，对均衡输出序列进行截断处理，得到截断处理后的二阶沃尔泰拉反馈均衡的第一比重系数；对第一比重系数进行聚类，得到若干第二比重系数，获取真实符号，基于若干第二比重系数对真实符号进行比重共享非线性预编码。本发明实施例通过对截断处理后的二阶沃尔泰拉反馈均衡的比重系数进行聚类，进一步减少比重系数，采用聚类降低比重共享非线性预编码方法的复杂度，进一步降低IMDD光纤传输系统的成本。