An Investigation of the Spatial Correlation Influence on Coded MIMO-OFDMA System Performance

This paper investigates the combination of the codings on correlated channel in physical layer and the dynamic channel allocation (DCA) algorithm in MAC layer of multi input multi output orthogonal frequency division multiplexing access (MIMO-OFDMA) system. Different spatial - time/frequency techniques such as: space-frequency block coding (SFBC), space-time block coding (STBC) and the cancelling interference algorithm as Vertical Bell Laboratories Layered Space Time (VBLAST) combined with an equalizer are deployed in the MIMO systems for comparison of the performance of system in terms of symbol error rate (SER). We use the spatial channel model (SCM) approach, proposed by the 3rd Generation Partnership Project (3GPP) organization on LOS (line of sight) case. From the simulation results, system performance is improved significantly if the transmit antenna spacing is increased, especially when using the SFBC coding. We have shown a very close connection between the SER and the spatial correlation properties on a coded channel. Based on the DCA, we can see that the channel properties when applied coding scheme on the spatial correlation effected channel.