正则化在层析成像技术中的应用

Application of regularization in Network Tomography

针对现有连续模式中链路时延函数形式难以假定的问题,提出一种直接的基于正则化的时延层析成像估算方法,该方法没有预先对链路的时延函数形式进行假设,而是结合了正则化的理论并对现有的谱修正方法进行了改进,由光纤通信网络中的时延的线性模式得出一个迭代式,然后利用这个迭代式进行直接迭代求解,从而得出链路上的时延的估算值。通过MATLAB和NS2仿真软件获得的数据进行了仿真实验,验证了该方法的有效性,在链路时延分布假定不合适时,该方法得到的时延估算值的精度高。

According to the problem of difficulty to assume the function of link delay in continuous mode,a direct delay estimated method based on regularization is put forward,which is without to assume the function of delay in advance,and utilize the theory of regularization and make an improvement on the existing spectrum correction method to deduct an iterative expression on the basis of the linear model of delay in optical fiber communication network,and the estimated value of link delay can be in direct infer from the iterative expression by the use of iterative method. The experiments on MATLAB and NS2 simulation confirm the method is effective,and the accuracy is improved when the assumption on link delay distribution before is not correct.