Research And Application Of Intelligent Reflective Surface Assisted Data Communication Reliability

Intelligent Reflecting Surface(IRS)technology controls the phase and amplitude of the incident signal and intelligently reconfigures the wireless channel,which is a key technology for 6G Nowadays,in the face of massive device access and increasing traffic data,improving spectrum utilization,enhancing coverage,and reducing overall power consumption have become urgent issues to be solved.Therefore,this paper focuses on the IRS-assisted wireless communication network and conducts an in-depth study on it.First,an IRS-assisted Multiple-Input Single-Output(MISO)wireless communication system is investigated.The system uses an extended error vector magnitude model to describe the non-ideal Radio Frequency(RF)link error and considers the effect of IRS phase noise.The exact expressions of Block Error Rate(BLER)for short packet communication and Symbol Error Rate(SER)for long packet communication under Nakagami-m fading channel are obtained.In addition,to reveal the effects of RF impairment and phase noise on the system performance metrics,closed-form expressions for the average BLER and SER of the system are derived.The agreement of the numerical analysis with the Monte-Carlo simulation results verifies the accuracy of the derived theoretical results,and the study is of great significance for the analysis and design of IRS-assisted MISO-based short/long packet communication systems.Then,IRS-assisted Wireless Power Transfer(WPT)system is discussed.The energy source sends RF signals to the source with the assistance of IRS,and the source acquires energy from the RF signals and uses the acquired energy to communicate with the destination node.Specifically,the expressions for the outage probability,SER and average BLER of the system are obtained by considering the two cases in which the IRS can achieve the desired phase adjustment and the presence of 1-bit phase error,assuming that the channels all experience Rayleigh fading.The effect of parameters such as the number of reflective elements,transmit signal-to-noise ratio,energy conversion efficiency and phase error on the system performance is investigated.This study provides a theoretical basis for the analysis and optimal design of IRS-assisted WPT communication systems.Finally,an efficient transmission scheme applicable to the proposed system is proposed for the downlink communication system assisted by multiple IRSs and relay stations.The scheme is jointly optimized for IRS selection and power allocation coefficients to minimize the average BLER for long-range users based on the channel estimation results while satisfying the average BLER requirement for near-range users,and the results of the study show that the proposed scheme has higher transmission reliability under Nakagami-m fading environment.This part of the results provides a green and efficient transmission scheme for the reliability optimization of short packet communication networks assisted by joint multiIRS and relay stations.