实际环境中的信道多为参数随时间变化的随参信道.为了更好地适应随参信道环境,设计了 4个频率和4 个时隙的基于时频调制(Time Frequency Modulation,TFM)的线性调频(Linear Frequency Modulation,LFM)雷达通信一体化(Dual-Functional Radar and Communication,DFRC)脉冲信号.为了进一步增强其抗多径衰落的能力,在其基础上引入正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术来生成基于 TFM 的 OFDM-LFM DFRC 脉冲信号.为了实现恒模传输一体化脉冲信号,在其基础上引入恒包络(Constant Envelope,CE)技术来生成基于TFM的CE-OFDM-LFM DFRC脉冲信号.为了突破香农信道容量的上限和增大信号的发射能量,在其基础上引入多输入多输出(Multiple-Input Multiple-Output,MIMO)技术来生成基于 TFM 的 MIMO-CE-OFDM-LFM DFRC 脉冲信号.通信误比特率(Bit Error Rate,BER)仿真结果表明,设计的4个信号在通信传输时均具有优良的BER性能.雷达模糊度函数(Radar Ambiguity Function,RAF)仿真结果表明,设计的4个信号在雷达探测中均具备优良的距离和速度分辨率.
Integrated Pulse Signal Design for MIMO-CE-OFDM-LFM Radar Communication Based on Time Frequency Modulation
In actual environments,channels are mostly parameter dependent with time-varying parameters.In order to better adapt to the random reference channel environment,a Time Frequency Modulation(TFM)based on 4 frequencies and 4 time slots was de-signed,Linear Frequency Modulation(LFM)of TFM,Dual-Functional Radar and Communication(DFRC),DFRC pulse signal.In order to further enhance its ability to resist multipath fading,Orthogonal Frequency Division Multiplexing(OFDM)is introduced on the basis of it,OFDM technology is used to generate OFDM-LFM DFRC pulse signals based on TFM.In order to achieve integrated pulse signal transmission with constant modulus,a Constant Envelope(CE)is introduced based on it,CE technology is used to generate TFM based CE-OFDM-LFM DFRC pulse signals.In order to break through the upper limit of Shannon channel capacity and increase the transmis-sion energy of signals,Multiple-Input Multiple-Output(MIMO)is introduced on this basis,MIMO technology is used to generate MIMO-CE-OFDM-LFM DFRC pulse signals based on TFM.Bit Error Rate(BER)for communication,The simulation results show that all four signals designed have excellent BER performance during communication transmission.The simulation results of RAF(Radar Ambiguity Function)show that all four signals designed have excellent range and velocity resolution in radar detection.
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