Performance Analysis of MIMO STBC System in Flat Fading and Frequency Selective Fading Channels

Multiple Input Multiple Output (MIMO) technology is one of the technique that can be used to overcome multipath fading. The multipath fading is caused by signals coming from several paths that have different attenuations, delays, and phases. In a multipath condition, an impulse that sent by the transmitter will be received by the receiver, it is not as an impulse but as a pulse with a spread width that called delay spread. Delay spread can cause inter symbol interference (ISI) and bit translation errors from the information received. To determine the effect of delay spread on the MIMO system, the research of the MIMO systems performance on flat fading channel and frequency selective fading was using the Space Time Block Code (STBC). This research was conducted using MatLab 2018a software. The simulation results show that the MIMO STBC system performance on flat fading channels is better than the MIMO STBC system performance on the frequency selective fading channel. This result is analyzed based on the value of BER vs. Eb/No and eye diagram. Index Terms — Delay Spread, Flat Fading, Frequency Selective Fading, MIMO, STBC.