A Cramér-Rao Bound Analysis for mmWave PMCW MIMO Radar with Quantized Observations

We consider parameter estimation in mmWave phase modulated continuous wave (PMCW) radar with quantized observations. We derive the Cramér-Rao bound (CRB) for jointly estimating targets' amplitudes, time delays, Doppler shifts, and directions. Our analysis provides an efficient method to compare the estimation performance achieved by different quantization schemes. We show that when the targets' amplitudes are similar, quantization does not severely affect the estimation performance. However, if the targets' amplitudes are different, the estimation performance will deteriorate rapidly due to quantization. Finally, we provide numerical results to evaluate the CRB.