Communication‐embedded OFDM chirp waveform for delay‐Doppler radar

A fundamental problem in the fusion of wireless communications and radar is to design suitable waveforms that can be simultaneously used for information transmission and radar sensing. In this study, the authors extend the orthogonal frequency division multiplexing (OFDM) waveform by embedding communication codes to communication‐embedded OFDM chirp waveforms for delay‐Doppler radar applications. The waveforms are characterised by jointly utilising the advantages of classic phase modulation in communications and chirp frequency modulation in high‐resolution radar. The integrated radar‐communication system scheme is formulated, which can operate as wireless communications and delay‐Doppler radar simultaneously. In a generic monostatic radar setting, a closed‐form expression is derived to evaluate the ambiguity function of the designed waveforms, along with the average and variance analysis of the ambiguity function.