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受多种光纤非线性因素的影响,基于正交频分复用(OFDM)技术的无源光网络(PON)会受到较为严重的载波间干扰(ICI)。为了抑制OFDM-PON系统中的上述问题,构造了一种新的伪对称序列(PST),并提出将该问题转化为求解两个Toeplitz子系统,然后对其中一个子系统的解进行预处理,将其转化为另一子系统的输入,之后利用最小二乘准则对子系统求解,从而达到抑制载波间干扰的目的。在算法实现过程中,利用所构造序列的伪对称特性和快速傅里叶变换(FFT),避免了高阶矩阵直接求逆,从而提升了算法实时性。仿真结果表明,该方法不仅能够有效抑制OFDM-PON系统的载波间干扰,而且能有效提升该算法的实时性能。
Due to various optical fiber nonlinearities, passive optical network (PON) based on orthogonal frequency division multiplexing (OFDM) technology suffers from severe inter-carrier interference (ICI). In order to suppress the above-mentioned problems in OFDM-PON system, a new pseudosymmetric sequence (PST) is constructed and put forward to transform the problem into two Toeplitz subsystems. Then the solution of one of the subsystems is preprocessed, Transforms it into the input of another subsystem, then uses the least squares criterion to solve the subsystem, so as to achieve the purpose of suppressing the interference between the carriers. In the process of algorithm implementation, the pseudosymmetric property and fast Fourier transform (FFT) of the constructed sequences are used to avoid the direct inversion of higher-order matrices and improve the real-time performance of the algorithm. The simulation results show that this method not only can effectively suppress the inter-carrier interference of OFDM-PON system, but also can effectively improve the real-time performance of the algorithm.