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一、引言近代移动通信系统已经成了国民经济各部门提高经济效率的重要手段。例如,在农业部门的调度站开通无线电通信,就能提高拖拉机站的生产效率,缩短联合机的停机时间,从而加速完成农业生产任务。在移动业务(应急、维护秩序、消防业务等等)中,大力采用无线电通信,尤其是在天灾和应急情况下是无法取代的。随着移动通信系统的数量的不断增加(每隔4至5年,无线
I. INTRODUCTION Modern mobile communication systems have become an important means of improving economic efficiency in all sectors of the national economy. For example, the opening of radio communications at dispatch stations in the agricultural sector can increase the productivity of tractor stations, shorten the downtime of associated machines and speed up the completion of agricultural production. In the mobile business (emergency, maintenance order, fire service, etc.), the vigorous use of radio communications, especially in natural disasters and emergency situations is irreplaceable. As the number of mobile communication systems continues to increase (every 4 to 5 years, wirelessly