Experimental evaluation of high speed parallel data transmission technology for wireless repeater system

Abstract

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 4x4 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 4×4 MIMO transmission are in good agreement. Frequency utilization of over 20 bits/s/Hz can be achieved: 800Mbps/1.6Gbps 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.