A Cramér-Rao Lower Bound for Analyzing the Localization Performance of a Multistatic Joint Radar-Communication System

It is expected that the 6G standards will have localization and sensing capabilities integrated as a part of the core technology. To that end, this paper considers the problem of localizing a point scatterer by using a distributed system of OFDM multi-antenna access points. Our setup envisions a joint hardware for both communications and sensing, where the communications waveform is reused for localization purposes. A multistatic approach is considered, and the Cramer- Rao lower bound is derived in order to assess the localization performance. The results are demonstrated by simulation and in an experimental setup, where it is observed that the bound is optimistic, but still within reasonable limits to the experimental results.