DOI: 10.1109/TMTT.2024.3508018   IEEEXplore: https://ieeexplore.ieee.org/document/10806490    

Bistatic radar in the context of 6G integrated sensing and communication (ISAC) with a novel pilot-based sampling frequency offset estimation method

26.2 GHz

A novel technique to more accurately determine sampling frequency offset (SFO) estimation with an algorithm called tilt inference of time offset (TITO) significantly improves SFO estimation for improved target imaging. TITO obtains channel impulse response (CIR) estimates from available pilot subcarriers to enable adaptive selection of delay estimates that are only negligibly impaired by SFO-induced inter-symbol interference (ISI). Utilizing these selected delay estimates significantly improves SFO estimation and consequently radar imaging performance. A scenario without a direct line of sight (LoS) between transmitting and receiving ISAC nodes uses a relay reflective intelligent surface (RIS) to create the required reference path for the TITO algorithm.

6G bistatic radar sensing for mobile integrated sensing and communication (ISAC) networks.

0.40 Gb/s communication data rate, 69.24 dB processing gain; 1227.95 m max unambiguous range, 306.99 m max inter-symbol interference (ISI) free range, 0.60 m range resolution. 97.66 kHz max unambiguous Doppler shift, 24.41 kHz max ICI-free Doppler shift, 47.68 Hz Doppler shift resolution.