Waveform Synthesis for MIMO Joint Communications and Sensing with Clutters-Part I: Space-Time-Frequency Filtering

In joint communications and sensing (JCS), the two different functions need to be integrated in the same waveform. For the purpose of sensing, the waveform is expected to filter out clutters and enhance the reflected signal from the target. Therefore, the transmitted waveforms can be considered as a set of filters, which reshape the signal in the dimensions of space, time and frequency. To accomplish the data communications, information needs to be modulated into the set of filters, as codewords located on the filter manifold. In the first part of this paper, the spatial-time-frequency filtering is studied for the performance of sensing, thus disclosing the signal structure into which the communication information can be embedded, in a superposition coding manner. The detailed coding scheme for information embedding will be studied in the second part of this paper.