Design And Implementation Of Communication System Of Intelligent Wireless Node For Internet Of Things

With the increasing force on research and application for the Internet of Things(IoT),a variety of wireless nodes for Internet of Things are designed.On these nodes,distance of communication of nodes is only ten meters or hundreds meters.When the information is needed to obtain on a large area,it requires a lot of nodes within a small range,resulting in waste because of a short distance from the nodes' communication,which leads to the effective performance of the communication node decreasing,using of the band conflicting.How to resolve short distance and effective communication of nodes that becomes one of hotspots of research.The article designs a communication system of intelligent wireless node for Internet of Things from the perspective of long telecommunications effectiveness.Wireless nodes collect temperature data and humidity data from complex environment.The processor transfers data to wireless RF module and then transmits.The wireless RF module is developed of CC1200 and CC1190 chip.CC1200 is a chip of low power,high performance,lower then 1GHz.The RF module can enhance 3dB of the reception sensitivity and 27dBm of output power when they are combination.So the function of long-range communication between nodes is realized.The system uses TI's new OMAP-L138 development kit as processor.OMAP-L138 Development Kit Integrats with lower power floating-point digital signal processor(DSP)and ARM processor.On this basis,the system can realize more complex algorithms.Because of complex environment of the wireless nodes'application,nodes' communications maybe interference,so article proposes energy detection algorithm based on RSSI and verifies it on the system.When the primary channel is occuppied,communication of the node can be transferred to other channel.It increases effectiveness of communication and utilization of the spectrum.The system is combination sernors technology,wireless communication technology and cognitive radio technology focuse on solving the following three questions:1,Communications distance between the nodes is short.2,Capacity of processing of the nodes is so simply that it cannot be intelligent.3,Anti-jamming performance of the nodes'communications is weak and transmission data easily lose.This article realizes more intelligent,transmission distance farther,stronger anti-interference performace of the nodes.The testbed can be used for communication of intelligent networking for Internet of Things in rural areas,mountainous,pastoral areas and other remote areas.It also uses for communications of intelligent of bands hotspots.It is important practical significance that system promotes the wireless communications long-range intelligent networking,cognitive radio research and validation.