ISAC-Motivated Interference Elimination in Wireless Communication Networks: A Pulse Compression Approach

Motivated by the robustness of frequency modulation continuous wave (FMCW) radar to interference and the potential application in integrated sensing and communications (ISAC), a novel scheme of interference elimination in wireless communication networks is proposed. In the proposed scheme, pulse compression, supported by the modulation over a wide-band waveform instead of the traditional sinusoidal carrier, is employed to compress the continuous-wave signal into peaky pulses. Then, with a large probability, an interference with a time offset significantly different from the travel time of legitimate communication signal can be eliminated. The isolation and elimination of interference can also be interpreted as the decomposition of multiple amplitude modulation (AM) signals over the frequency domain. Both the single- and multiple-carrier cases are taken into account. An interference diversity approach, employing co-prime symbol periods, is proposed to minimize the impact of hard collision that cannot be eliminated. Numerical simulations are carried out to demonstrate the validity of proposed schemes.