Performance analysis of typical frequency domain spreading multicarrier CDMA modulation in mine tunnel
Qingqing Zhou · Meitan xuebao · 2010
The bit error rate (BER) performance of a typical frequency domain spreading multicarrier CDMA (MCCDMA) modulation in mine tunnel was analyzed based on the established multi-section Nakagami distribution statistical channel model of mine tunnel for wideband radio wave. According to the different root-mean-square (RMS) time delay of wideband radio wave along empty-straight or embranchment mine tunnel,the main parameter restriction condition of MC-CDMA was given so that any sub-carrier experiences frequency-unselective fading channel. Under the circumstances of straight or embranchment mine tunnel the BER performance of a typical MC-CDMA system at 1. 8 GHz and 2. 4 GHz was simulated either at the influence of Doppler frequency offset or impulse interference. Simulation results indicate that the BER performance of the typical MC-CDMA is well in the empty-straight mine tunnel at a lower signal-to-noise (SNR) even though Doppler frequency offset or impulse interference exists. However,a larger SNR is needed for an accepted BER performance in the embranchment mine tunnel whether Doppler frequency offset or impulse interference exists or not.