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System studies are being conducted at millimeter-wave frequency for high-speed wireless communications such as several Gbit/s. However, the highly rectilinear propagation characteristics of these systems, created by the millimeter-wave frequencies, place significant limitations on the applications and the usage environments. To address this problem, we already proposed the adoption of a high data-rate relay system using short range multi input multi output (MIMO) transmission technology. This paper reports the results of experiments conducted to verify the simulation method. We evaluate 4 Ã 4 MIMO transmission, using the signal specified by IEEE 802.11n, and confirm that the optimal array spacing. The measured and simulated frequency utilization rates of 4 Ã 4 MIMO transmission are in good agreement. Frequency utilization of over 20 bits/s/Hz can be achieved: 800 Mbps/1.6 Gbps transmission can be realized when the bandwidth of 40/80 MHz is assumed. Moreover, the measured and simulated results indicate higher frequency utilization rates than found in the i.i.d. channel.