Design And Research Of Smart Home Control System Based On ZigBee Technology

With the progress of times,people have much to be desired for security of living environments.Traditional home monitoring systems often rely on deployment of sensor nodes completely,such as installation of sound and light alarm devices.However,this type of mechanism has limited detection range and insensitivity.Thus it can not effectively accomplish system security.At the same time,early intelligent home mechanisms not only have obvious limitation on factors such as transmission bandwidth,stability,but also do not support some key technologies such as automatic voice alarm.With the development of communication technology,three major operators of China have started large-scale popularization of LTE(Long Term Evolution)communication technology,Compared with 3G communication standard,the fourth generation communication protocol standard adopts LTE which uses OFDM(Orthogonal Frequency Division Multiplexing)and MIMO(Multi-Input&Multi-Output)key transmission technology to significantly increase spectrum efficiency and data transmission rate.LTE network structure is more flat and simple,thus reduces complexity of network nodes and system delay and can realize better real-time operation.In view of shortcomings of traditional smart home system,and making full use of the advantages of LTE communication technology,a new real-time smart home control system based on ZigBee network is proposed.The system constructs a Wireless Sensor Network(WSN)through ZigBee short distance communication protocol,and collects monitored signal frim each node via WSN and sends feedbacks to the control system in time.MCU control system establishs real-time communication with LTE communication module by AT command,and sends voice information to the desgnated service center or user terminal to establish remote communication links.This communication links can provide real-time transmission for live video or image signal,and better functionality for real-time smart home monitoring system.The main work of this dissertation is listed as follows:(1)This dissertation describes background and development process of WSN,ZigBee,4G-LTE technology,and presents a new smart home solution combining WSN,ZigBee and LTE communication technology.The key technologies and basic principles of ZigBee and WSN are analyzed to provide a theoretical support for formulation and implementation of an appropriate smart home control system scheme and select the basic networking technology and communication method for this system;(2)This dissertation completes the design of control module in smart home system based on ZigBee technology,mainly from the development platform?USB interface module?functional modules three aspects of detailed analysis of the system hardware architecture and software design.Combined with the practical application in the smart home scene,the function of each module is analyzed and verified;(3)This dissertation describes basic structure and principles of LTE communication technology,analyzes key technologies of LTE system such as OFDMA,MIMO,VoLTE and so on.Then test,analyze and optimize the LTE network of the proposed scheme by experiment.It provides the network environment foundation for the practical application of smart home control system.Result shows that the new smart home system has the characteristics of good real-time performance,high reliability,excellent interaction,versatility and practicability,and has broad application prospects.