  This work is devoted to solve the problem of estimating the carrier frequency
offset, phase offset, amplitude, and SNR between two mmWave transceivers.
  The Cram\'{e}r-Rao Lower Bound (CRLB) for the different parameters is
provided first, as well as the condition for the CRLB to exist, known as
Regularity Condition. Thereafter, the problem of finding suitable estimators
for the parameters is adressed, for which the proposed solution is the Maximum
Likelihood estimator (ML).
