  In this paper we consider the estimation of channel coefficients and
frequency offsets for LOS MIMO systems. We propose that by exploiting the
structure of the channel matrix, which is present due to the geometrical nature
of the channel, the estimation process can be enhanced. If a single oscillator
setup is used at transmitter and receiver, respectively, this structure is
preserved and can be exploited. Some methods using this fact are discussed and
their performance is evaluated with respect to estimation accuracy, revealing
that with relatively short training sequences, estimation results close to the
fundamental bounds can be achieved.
