2×2 Real-time Code-Division Multiplexed MIMO channel sounder

In this paper, a 2×2 time-domain Multiple-Input Multiple-Output (MIMO) channel sounder is presented. The developed system is based on Code Division Multiplexed (CDM) signals. It is formed by a base band pulse generator, a wideband I/Q modulator and a digital store oscilloscope. This system is compared to a frequency domain channel sounder by means of measurements in order to assure the accuracy of such measurements.