Low PAPR Sequences Based On Evolutionary Algorithm (EA) And Coordinate Descent (CD) Algorithm For Applications In 5G NR

The 5th generation(5G)mobile communication defines three application scenarios:enhanced mobile broadband(e MBB),massive machine type of communication(m MTC),and ultra-reliable and low latency communication(URLLC).Aiming at achieving URLLC,this thesis analyzes the physical uplink control channel(PUCCH)and uplink channel Sounding Reference Signal(SRS)in 5G New Radio(NR)system,and studies the control signaling and receiver processing,as well as the improvement the uplink radio coverage using different SRS.Generally speaking,SRS sequences with low peak to average power ratio(PAPR)characteristics can improve the transmission power efficiency of user equipment(UE)and enhance the channel detection quality at the cell edge UE.In this thesis,two optimization algorithms are used to study SRS sequences with low PAPR,namely evolutionary algorithm(EA)and coordinate descent(CD)algorithm.For EA algorithm,the algorithm procedure is improved,which is suitable for searching binary and quaternary SRS sequence sets.For the CD algorithm,on the basis of reducing the number of iterations,a new detection reference signal sequence set with low PAPR and low time-domain cross-correlation is selected efficiently by using the max-min optimization algorithm.Compared with the Zadoff-Chu(ZC)sequence of 3GPP protocol standard,the new sequences generated greatly reduces the PAPR of the signal at the cost of slightly higher time-domain cross-correlation.A new PUCCH sequence set is obtained based on CD algorithm.The sequence set is better than 3GPP sequence set in PAPR and time-domain cross-correlation.Then,the selection method of resource block(RB)based on SRS feedback is given at the transmitting end of PUCCH,and a two-step detection scheme is designed at the receiving end.The results show that both methods are helpful to improve the performance of PUCCH.The corresponding MATLAB simulation platform is built to simulate the PAPR and timedomain cross-correlation characteristics of the new sequences,as well as the performance of PUCCH receiver,confirming the effectiveness of the proposed methods.