Passive time delay estimation for complex noncircular signals
Fei Wen, Qun Wan, Yipeng Liu · 2012
This paper addresses the passive time delay estimation (TDE) issue for complex signals. First, we derive the maximum likelihood (ML) estimator for the white Gaussian complex signal model with uncorrelated circular noise whereas the source signal is not restricted to be circular. Then, we present another TDE method using only the conjugate cross-correlation (CCC) measure to deal better with correlated noise for noncircular signals. Moreover, the Cramer-Rao lower bound (CRLB) of passive TDE is generalized to circular complex signals.