Short Packet Communication Performance Optimization And FPGA Implementation Of Internet Of Things

The main vision of the Internet of things(IOT)is to equip physical objects in real life with computing and communication capabilities so that they can interact for the benefit of society.As one of the key members of the Internet of things,the Internet of vehicles(IOV)has made great progress in communication technology.Vehicles can now easily exchange information about safety,efficiency,Infotainment and comfort with other vehicles and roadside infrastructure.In the process of vehicle networking information interaction,most roadside facilities are various types of sensors.The monitoring data packets uploaded to the vehicle are short and not fixed.Under different business types,they can reach several bytes to hundreds of bytes.In the process of information exchange,the safety warning information needs to meet the requirements of high reliability and low delay.However,the main design goal of the existing wireless communication system is the effectiveness of transmission,which can not meet the transmission requirements of the Internet of vehicles.Therefore,it is urgent to optimize the performance of short packet communication.In order to meet the effectiveness and accuracy of the data uploaded by the sensor to the vehicle,this paper proposes the performance optimization for short packet communication and the hardware implementation of the related optimization method.Firstly,this paper constructs the system model of downlink and uplink of Internet of Things.In the model,roadside sensors upload short packet data and include the interference of other sensors.Based on the model,the frame structure of short packet data is designed.On the basis of meeting the demand of total transmission delay,the frame structure of traditional 5G NR system is changed to increase transmission efficiency.Secondly,this paper analyzes the transmission reliability of the system,improves the performance of the traditional channel estimation algorithm,and ensures the reliability requirements in the face of complex channels.For traditional channel estimation methods,including least square(LS)and minimum mean square error(MMSE),in the scenario of short packet communication,due to the short packet length and the small number of pilots,the channel estimation error increases and the reliability decreases.In this paper,the transmission data is used as the virtual pilot and the traditional pilot for joint channel estimation to improve the performance of channel estimation.Thirdly,since most of the power supply methods of roadside sensors are battery power supply,it is necessary to limit the transmission power to a certain extent to avoid excessive energy consumption.In this paper,the energy efficiency of short packet data transmission is optimized to meet the requirements of reliability and delay.Through reasonable and effective distribution of transmission power,on the one hand,it can effectively transmit data,on the other hand,it can save energy consumption.Finally,this paper implements the proposed channel estimation optimization method with FPGA hardware,mainly including transmitter and receiver.The transmitter implements the proposed frame structure,coding and modulation,and the receiver is mainly responsible for the implementation of decoding,channel estimation and optimization algorithm.