Resarch Of IMT-Advanced Channel Hardware Simulator

The wireless channel is the mobile communication medium, the wireless channelperformance is directly to the people communication quality. Wireless channel is mainlythe reflect wave propagate environment. It is not only one antenna's signal to the mobilestation, but they are compose of many ways and the numerous reflected wave. Thewireless channel is complex and the changeable , because of multipath propagation, theelectromagnetic wave will meet many buildings and trees ,as well as the fluctuationterrain in the transmission, these will cause the energy absorption and the penetration aswell as the electromagnetic wave reflection, the scatter, the diffraction, the diffractionand so on, because after the scatter and the diffract electromagnetic wave energy will beweak.Therefore, consider generally only the reflected wave. Thus, wireless channel isthe reflected wave environment. Because of the electromagnetic wave adopts the waythe distance is different, therefore each way comes the reflected wave arrival time isdifferent, the phase is not the same. Different phase's many signals are add in the mobilestation receiver, the synchronism superimposition strengthen, the oppositionsuperimposition is weaken.With the smart antenna and multi-input-multi-output system's appearance, at thesame time the wireless channel must consider the angle the expansion. As a result ofwireless channel's communication information in the time, the frequency and the angleexpansion. So, the wireless channel becomes complicate and changeable. The user havehigher requirement for wireless communication at recently, wireless communication'sresearch and development also become more and more higher. In order to test, thegeneral layout personnel need in laboratory simulation wireless channel's variouscharacteristics, in order to design the system carry on the modulate and the test.Therefore, the establishment migration wireless channel model is very important.It hasthe vital significance to the fundamental research and the project application.