Abstract
The technique of joint communications and sensing (JCS) integrates both functions in the same waveform, thus reusing the frequency spectrum, transmit power and hardware. The two functions need to be multiplexed, while they also benefit each other. In this paper, the function multiplexing of JCS is in the frequency domain, leveraging the orthogonal subcarriers in orthogonal frequency division multiplexing (OFDM). To exploit the mutual benefits of subcarriers dedicated to communications and sensing, the signals over the communication subcarriers are leveraged for the function of sensing. The signals over the dedicated sensing subcarriers are made adaptive to the communication signals, in order to optimize the integrated sidelobe levels (ISLs) of the overall waveform and improve the sensing performance. Since the signals over the dedicated sensing subcarriers are functions of the communication signals, due to the adaptive waveform synthesis, they provide redundancies for the communication signals and improve the reliability of data transmission. The proposed JCS scheme is demonstrated by numerical results.
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