Analysis And Optimization Of Short Packet Transmission In Energy Acquisition Wireless Communication System

The sixth generation of mobile communications will create an integrated network of"air-land-sea"to achieve large-scale communication connections.It faces three major challenges,including the shortage of spectrum resources,charging of machine-like devices,and how to achieve high reliable transmission.Non-orthogonal multiple access(NOMA)and energy acquisition technology based on radio frequency signals can effectively solve the above problems.At the same time,with the rapid development of mobile Internet and Internet of Things applications,limited blocks of long and short packet data have become the main data type.Therefore,for NOMA technology and energy acquisition technology,this paper focuses on the theoretical performance of short packet transmission and security transmission optimization issues.Firstly,we study NOMA short packet transmission network based on energy harvesting.Using wireless information transmission and energy transfer technology and considering hardware damage,we obtain accurate expressions of average Block Error Rate(BLER)and throughput of short packet transmission.Furthermore,we analyze the influence of energy conversion efficiency,data bit number and power distribution coefficient on performance.Finally,the Monte-Carlo simulation results match with the numerical analysis results,which confirms the correctness of the theoretical analysis.The research results of this chapter provide guidance for the transmission of short packet data in NOMA networks based on energy harvesting.Secondly,we analyze the transmission performance of long-packet data and short-packet data in a full-duplex two-hop relay system with a nonlinear energy acquisition model.We derive the average BLER of the system when transferring short packets of data and the exact expressions of the interrupt probability and throughput when transferring long packets of data respectively.Finally,the simulation verifies the correctness of the theoretical results,and analyzes the influence of related parameters on the performance.The research results of this chapter provide an important reference for the application of nonlinear energy acquisition technology in full-duplex relay system.Finally,we studied a communication system based on Intelligent Reflecting Surface(IRS)assistance for energy collection.We discussed two different system models and designed two different short packet secure transmission schemes for different system models.In an IRS assisted relay communication system,the optimal IRS is selected through channel gain,and the power allocation coefficient of the pilot signal is optimized with the goal of maximizing the lower bound of the secret rate while ensuring that the SNR received by the user is greater than a certain threshold;In IRS-assisted NOMA communication systems,under the premise of ensuring that eavesdroppers collect a certain amount of energy,the optimal IRS is selected using the channel gain between the source node and the user.Based on the selected optimal IRS,the power allocation coefficient is optimized with the goal of maximizing the lower bound of the security rate at the user.The scheme proposed in this chapter can optimize the energy efficiency of wireless communication networks and achieve effective and safe transmission of system information.