Study on application of CDMA technique in mine mobile communication

The propagation characteristic of electromagnetic wave along laneways was analyzed. And that the basic reason for the difficulty of mine wireless communication was the severe decline of electromagnetic wave (especially the multipath decline) was pointed out. Then according to spread spectrum communication and diversity reception technique, the ability of code division multiple access (CDMA) communication system to resist multipath decline and other interference was expounded. Finally, by applying the CDMA technique to mine mobile communication, a high resistance to decline and intelligent mobile communication system CDMA mobile communication system was formed. Therefore, the status of mobile communication in mine will be quite changed, and the global mobile communication on earth's surface and underground will be realized.