Performance Comparison of MIMO Channel Sounder Architecture in Between TDM scheme and FDM scheme

A conventional channel sounder for measuring MIMO radio channel is based on time division multiplexing (TDM) using pseudo-random binary sequence (PRBS) as a pilot sequence and can measure the MIMO channel accurately in slow fading environment. However this sounder has a big drawback that the accuracy of channel measurement is degraded largely in fast fading environment. To overcome this limitation, channel sounding architecture based on frequency division multiplexing (FDM)[1] has already proposed, but the performance comparison between novel FDM scheme and conventional TDM scheme was not presented. In this paper, channel sounding performance between conventional TDM scheme and proposed FDM scheme is compared by mean square error (MSE) and angular spread error (ASE) through simulation. As a result, it is shown that the FDM sounding architecture measures MIMO channel more accurately than TDM sounding architecture with regard to MSE and ASE.