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近几年移动通信在全世界迅速发展,已在工业、林业、公安、运输、出租汽车和个人通信方面都获得了广泛应用.特别是数字频率合成技术和大规模集成电路技术的不断提高、更加快了移动通信的实用化进程.移动通信主要由移动电话(车载机或手持机)、无线电基站(BS)和移动电话交换机(MTX)组成.同固定电话相比、除了能在移动中使用外、更重要的是具有漫游功能.当用户
In recent years, the rapid development of mobile communications in the world has been widely used in industry, forestry, public security, transportation, taxis and personal communications. In particular, digital frequency synthesis technology and large scale integrated circuit technology continues to improve, more Speed up the practical application of mobile communications.Mobile communications mainly by the mobile phone (car or handheld), the radio base station (BS) and the mobile phone switchboard (MTX) .Compared with the fixed telephone, in addition to mobile use , More importantly, has a roaming function when the user