Analysis Of Shared Signal Performance And Research Of PAPR Suppression Based On OFDM

With the continuous development of information technology,the naval combat environment is becoming increasingly complex,and the ship combat platform must be equipped with a variety of electronic equipment.However,the increase in the number of equipment will aggravate the system load,increase the interference between equipment,and affect the overall efficiency of the system.Therefore,it is the main direction for the integrated development of electronic system of warship combat platform to combine the two main equipment of radar and communication,and establish an integrated system of radar communication with high flexibility and resource sharing.In radar communication integration of a variety of implementation scheme,implementation scheme based on sharing signal the highest level of integration,the plan is the key to design appropriate Shared signal,and it’s need to compromise consider sharing signal radar performance and communication performance,makes the radar communication in both can carry information integration system for radar detection can communicate at the same time.Orthogonal Frequency Division Multiplexing(OFDM)technology is widely used in the field of communication,and because OFDM signal has the advantages of large time and wide band width product,high detection resolution and strong ability to intercept,it is introduced into the radar field.Therefore,OFDM based shared signal research is the first choice.This thesis mainly analyzes the performance of shared signal based on OFDM,and carries out further research on PAPR suppression method of OFDM shared signal.Firstly,the realization scheme of radar communication sharing signal is studied,and the differences and similarities between radar and communication are analyzed,as well as the feasibility of the combination of radar and communication sharing signal.The performance evaluation index of radar communication shared signal is introduced,and through the analysis of the basic principle of OFDM,the radar communication system model based on OFDM and the working mode of OFDM shared signal are derived.The performance evaluation index of peak-to-average Power Ratio(PAPR)is introduced,and the causes and effects of high PAPR are analyzed.Then,the communication information is modulated to each subcarrier of OFDM radar signal to realize signal sharing,and the radar performance and communication performance of the shared signal are investigated by means of radar ambiguity function,bit error rate and communication rate.Firstly,the fuzzy function of OFDM radar signals is deduced and simulated,and the simulation analysis of the fuzzy function of shared signals based on Buck code,BPSK and 16 QAM is completed.Then,the bit error rate and communication rate of BPSK-OFDM and 16QAM-OFDM shared signals are analyzed to compare the communication performance of the two.The PAPR performance of 16QAM-OFDM shared signal is simulated and analyzed.Finally,the PAPR suppression method of shared signal is further studied.Selecting Mapping(SLM)and Partial Transmitting Sequence(PTS)are improved to obtain l SLM-μlaw and WHT-IPTS algorithms respectively,and the two algorithms are cascading together.Taking the output signal of l SLM-μlaw algorithm as the input signal of WHT-IPTS algorithm,an improved joint SLM-PTS algorithm,namely l SLM-μlaw-WHT-IPTS algorithm,is proposed.Finally,the PAPR value was reduced to 6.4d B.Bit error rate(BER)is generated by compression and diffusion technology,and the effectiveness of the algorithm is further verified by simulation analysis of BER performance.