Research On 5G PUCCH Receiving Technology Under High-speed Mobiles

Due to the vigorous development of railways,especially high-speed railways,communication-related technologies in the high-speed mobile environment have attracted extensive attention from academia and in-dustry.At the same time,5G New Radio(5G NR),as a new air wireless interface developed for 5G,has the characteristics of high reliability and low latency.With the continuous development of mobile communica-tion technology and the increase of people’s demand for network services,a large number of related technical researches on 5G are being carried out in an all-round way.Therefore,fifth generation(5G)technology may be a promising solution to the high reliability and high throughput requirements of communications in high-speed mobile environments.In the process of data transmission between the device and the base station,the uplink control information(UCI)carried by the Physical Uplink Control Channel(PUCCH)can control the uplink and downlink transmission.It is very important to be able to transmit normally and efficiently.There-fore,based on 5G international standards and protocols,this dissertation designs and improves the PUCCH receiving algorithm in 5G NR based on the high-speed mobile environment and Multi-TRP technology.The main researches are as follows:(1)This dissertation first studies the channel structure and channel estimation algorithm of PUCCH,including two basic algorithms,LS algorithm and LMMSE algorithm.On this basis,a time-domain Wiener filter channel estimation algorithm is proposed for the special PUCCH format,and linear interpolation is in-troduced.The complexity and mean squared error of the above channel estimation algorithms are compared by simulation.Next,two different signal detection methods: zero-forcing detection and MMSE detection are simulated and compared.According to the requirements of different PUCCH formats,select the appro-priate channel estimation algorithm to effectively reduce the transmission error of data symbols and provide theoretical guidance for the PUCCH baseband receiver.(2)The PUCCH baseband reception algorithm in the uplink of the physical layer of the 5G system is designed in combination with the relevant 3GPP protocol standards.At the same time,the performance of the5 G system in the high-speed mobile environment is studied,and the Doppler effect on the PUCCH reception performance is analyzed.influence.In response to this problem,this paper proposes an improved PUCCH receiving algorithm in high-speed mobile environments: adding frequency offset estimation and compen-sation,time offset estimation and delay compensation,and signal-to-interference-noise ratio estimation and measurement,etc.,adding multiple transmission points(Multi- TRP)technology application.In order to restore the high-speed mobile channel environment,this dissertation uses the uplink simulation link of the distributed MIMO channel model of the high-speed rail tunnel scene built by MATLAB software to simulate each PUCCH receiving algorithm.The mean squared error(MSE)and the bit error rate(BER)are selected as the criteria for judging performance.The simulation results confirm the feasibility and performance supe-riority of the improved receiving algorithm in the high-speed rail environment.