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Channel sounding
Channel Sounding is a technique used to evaluate the radio environment for the wireless communication, especially the MIMO systems. Because of the effect of terrain and obstacles, the wireless signals propagate in multiple paths, which is called multipath effect. In order to minimize or utilize the multipath effect, Channel Sounder is invented to process the multidimensional spatial-temporal signal and estimate the channel characteristics, which greatly helps the simulation and design of the wireless system.
==Motivation & applications==
The performance of mobile radio communication systems is significantly affected by the radio propagation environment.〔Thomä, R. S., Hampicke, D., Richter, A., Sommerkorn, G., & Trautwein, U. (2001). MIMO vector channel sounder measurement for smart antenna system evaluation. European Transactions on Telecommunications, 12(5), 427-438.〕 Because of the blocking by the building or natural obstacles, there exists multiple paths between the transmitter and the receiver with different time variances, phases and attenuations. In the Single-Input Single-Output (SISO) system, multiple propagation paths could be a big problem for the signal optimization. However, based on the development of multiple input multiple output (MIMO) system, it is becoming an advantage on enhancing channel capacity and improving QoS.〔Belloni, F. Channel Sounding.〕 In order to evaluate effectiveness of these multiple antenna systems, a measurement of the radio environment is needed. Channel sounding is such a technique that can estimate the channel characteristics for the simulation and design of antenna array.〔Laurenson, D., & Grant, P. (2006, September). A review of radio channel sounding techniques. In Proc. EUSIPCO.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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