MIMO-OFDM performance evaluation over meausured underground mine channel at 2.4 GHz

In this paper, the performance of orthogonal frequency division multiplexing technique, over a measured underground mine channel at 2.4 GHz, is investigated. The effect of increasing the number of subcarriers as well as the guard interval length is considered. In a further step, the performance of the OFDM scheme when combined with multiple input multiple output system, using, the well-known, diversity technique, space time block coding (STBC), is provided. The evaluation is given in terms of bit error rate as a function of the signal-to-noise ratio for 4-QAM and 16-QAM modulations. The effectiveness of the STBC-OFDM communication system over the multipath and scatters-rich underground mine radio channel is highlighted. The simulation results show an improvement of about 10 dB for STBC-OFDM over SISO-OFDM.