Simulation Analysis of MC-DS-CDMA Modulation in Mine Tunnel
Niu Li · Jisuanji fangzhen · 2009
Based on the multi-section Nakagami distribution statistical channel model of mine tunnel for wideband radio wave, the bit error rate (BER) performance of multicarrier direct-sequence code-division-multiple-access (MC-DS-CDMA) modulation in mine tunnel was simulated. Simulation results indicate that the BER performance of MC-DS-CDMA is decided mainly by the channel attenuation, and not by the root-mean-square (RMS) time delay of wideband radio wave along straight or embranchment tunnel. Doppler frequency offset has serious effect on the BER performance of MC-DS-CDMA modulation in mine tunnel. The BER performance of MC-DS-CDMA modulation in mine tunnel is affected little by impulse interference when it happens infrequently. However, the BER performance is affected seriously by impulse interference when it happens frequently. In case of multiusers, the BER performance of MC-DS-CDMA in mine tunnel is much better compared to that of DS-CDMA modulation.