## 1 Introduction
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Category** & **Reference** & **Model** & **Main Contributions** \\ \hline \multirow{6}{*}{Multiplex two independent signals in the time domain, frequency domain, space domain, and code domain} & \multirow{2}{*}{[7]} & Radar-embedded communications on an intrapulse basis & An incident radar waveform is converted into one of K communication waveforms, each of which acts as a communication symbol \\ \cline{2-3}  & & & \begin{tabular}{c} Optimize the transmission power of \\ different subcarriers and assign the same \\ OFDM subcarriers to different \\ communication receivers \\ \end{tabular} \\ \cline{2-3}  & [10] & Joint radar and communication waveform & Hide digitally modulated communication information inside an LFM radar signal \\ \cline{2-3}  & & \begin{tabular}{c} Joint monostatic and bistatic \\ radar-communication systems via \\ chaos-based frequency modulated \\ \end{tabular} & \begin{tabular}{c} Pulse generated through a chaotic \\ oscillator for broadband radar imaging; \\ information embedded by chaotic shift \\ keying in the pulse \\ \end{tabular} \\ \hline \multirow{6}{*}{Use a single spectrum shared transmission signal} & \multirow{2}{*}{[23]} & Dual-functional \\  & radar-communication & & \begin{tabular}{c} Achieved by embedding communication \\ signals into radar pulses \\ \end{tabular} \\ \cline{2-3}  & & \begin{tabular}{c} Design of integrated shared \\ waveforms for additional interference \\ \end{tabular} & \begin{tabular}{c} Jamming method based on intermittent \\ sampling inverse order filling for \\ generating leading false targets \\ \end{tabular} \\ \cline{2-3}  & [22] & Anti-jamming capability of the \\ shared signal & & \
\begin{tabular}{c} Interference with shared signals using noise \\ convolution and RF noise \\ \end{tabular} \\ \cline{2-3}  & [24] & Joint communication jamming &
\begin{tabular}{c} Integration signal waveform utilizing \\ false target jamming to increase the \\ detection threshold for constant false \\ alarm rate \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Research on the major contributions related to the type of paper proposal. cation aircraft. If the jamming signal and communication signal are emitted separately, the jamming signal will affect the communication process because the jamming beam is quite wide. To ensure communication quality, designing a transmit waveform with data communication and jamming radar is a very urgent need for the joint system. A ground-based joint system (see Figure 1) senses radar signals of the incoming aircraft and generates replicas that simulate target echoes to confuse airborne radar, hindering it from identifying true targets from false ones and protecting the ground-covered target from jamming object detection. Meanwhile, the reconnaissance information is transmitted to the communication object. The communication object can judge the behavior of the incoming aircraft in real time and execute the function of uploading and sending commands according to the communication data. Because the communication task does not have high requirements on the direction of the antenna, the joint signal emitted from the sidelobe can still be received by the communication object and processed for communication.