Design And Implementation Of Distributed Microwave Photonic Simulation System Based On Cloud Computing

With the advancing of information and science technology,microwave communications such as light wave communications have made significant progress,and the study on microwave photonics has received wide popularity.However,the research and development in microwave photonics simulation software hasn’t draw much attention of the domestic institutions while current mainstream products already show various deficiencies.An important one of these deficiencies is that these products don’t have an efficient solution to simulate the links with high complexity.This thesis has paid special attention to the device modeling,channel modeling and cloud computing for the microwave links simulation,and developed a distributed simulation system along with performance measurement and result validation.Three simulation modes are designed and implemented,with tests that validate the effectiveness of the cloud simulation system.The major contribution of this work includes:(1)The Box-Muller transform method,which can generate Gaussian random variables,the periodogram method,which can estimate the power spectrum,and the scattering matrix analysis method,which can model multi-port coupled transmission devices,are described.Illustrations are given through examples such as spectrum analyzer,silicon-based ring coupler and other specific devices.The fiber channel model and wireless channel model are introduced.While the fiber channel modeling is realized by solving the nonlinear Schrodinger equation by the fractional-step Fourier method,the principles of Rayleigh model,Rice model and Nakagami model in wireless channel are studied including their time domain properties,probability density,and statistical.Moreover,As the priority scheduling algorithm and the hash slot algorithm are described in detail,the task scheduling and data storage methods of the system in the cloud environment are explained.(2)Designed and implemented vector network analysis(VNA),third-order intermodulation measurement and spurious-free dynamic range analysis functions,so that the system has the ability to measure and analyze the three main performance indicators of microwave photonic links,namely gain,noise and dynamic range.The correctness and effectiveness of the simulation system are verified accordingly.(3)As the current microwave photonic simulation software does not have effective means to speed up the simulation time-consuming link models,cloud computing technology targeted to the characteristics of long time-consuming links are implemented in three accelerated modes for VNA,beam combiner and multi-measurement,respectively.The three acceleration modes can greatly improve the simulation efficiency of links with swept input,beam combiner and many measurement devices.In the tests,the performance of the three models has been improved to varying degrees,which verifies the efficiency of the proposed cloud simulation function.