This paper presents an experimental study of the propagation channel in Indoor environment with two radio link configurations: outdoor to indoor (O2I) and indoor to indoor (I2I). The experimentation has been carried out with a MIMO set-up which allows a full 3D space-time characterization of the channel. The analysis of the measurement is based on the Power Delay Profile (PDP) and on the Directions of Arrival (DoA) and Departure (DoD) of the waves. Evaluations of MIMO capacity are realized considering degrees of freedom of the channel, angular spread in azimuth and in elevation. The results shows the impact of transmitter locations and of the frequency on the space-time characteristics of the channel and consequently on the MIMO system performances.