摘要
正交频分复用(OFDM)波形设计是实现雷达通信一体化的物理层关键技术之一。OFDM波形通常存在峰均功率比(PAPR)高,以及波形自相关旁瓣电平高的问题。该文针对现有联合降低PAPR和自相关旁瓣方法存在的通信速率下降问题,提出了一种基于数据失真的一体化波形设计方法。该文还将通信数据的误差矢量幅度作为优化目标之一,降低了数据失真引起的通信误码率。首先,构建了PAPR约束下最小化积分旁瓣比和误差矢量幅度的优化模型。其次,根据调制星座图特点,通过外围星座调制的数据失真和所有调制数据失真,将多目标高维非凸优化问题转化为两个单目标优化子问题,分别采取凸松弛操作和交替方向乘子法(ADMM)求解简化后的子问题,得到低积分旁瓣比波形和PAPR约束下的低误差矢量幅度波形。仿真结果表明该方法设计的一体化波形可满足PAPR要求,同时具有良好的感知和通信性能。
Orthogonal Frequency Division Multiplexing(OFDM)waveform design is one of the key physical layer technologies for achieving joint radar-communication.OFDM waveforms usually have issues with high Peak to Average Power Ratio(PAPR)and high waveform autocorrelation sidelobe levels.This paper proposes an integrated waveform design method based on data distortion to address the communication rate degradation problem of existing joint PAPR and autocorrelation sidelobe reduction methods.The paper also takes the Error Vector Magnitude(EVM)of communication data as one of the optimization objectives,reducing the communication bit error rate caused by data distortion.Firstly,an optimization model was constructed to minimize the Integrated Sidelobe Level Ratio(ISLR)and EVM under PAPR constraints.Secondly,based on the characteristics of the modulation constellation,the multi-objective high-dimensional non-convex optimization problem is transformed into two single objective optimization subproblems by using the data distortion of outer constellation modulation and all modulation data distortion.Convex relaxation operation and Alternating Direction Method of Multipliers(ADMM)are respectively used to solve the simplified subproblems,resulting in low ISLR waveform and low EVM waveform under PAPR constraint.The simulation results show that the integrated waveform designed by the proposed method can meet the requirements of PAPR,and has good sensing and communication performance.
作者
刘燕
万显荣
易建新
LIU Yan;WAN Xianrong;YI Jianxin(School of Electronic Information,Wuhan University,Wuhan 430072,China)
出处
《雷达学报（中英文）》
EI
CSCD
北大核心
2024年第1期160-173,共14页
Journal of Radars
基金
国家自然科学基金(61931015,62071335,62250024)
湖北省自然科学基金创新群体项目(2021CFA002)
中央高校自主科研项目(2042022dx0001)。
关键词
波形设计
雷达通信一体化
正交频分复用(OFDM)
峰均功率比(PAPR)
旁瓣
误差矢量幅度
Waveform design
Joint radar-communication
Orthogonal Frequency Division Multiplexing(OFDM)
Peak to Average Power Ratio(PAPR)
Sidelobe
Error Vector Magnitude(EVM)
