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随着人类政治、经济活动范围的日趋扩大,及效率的不断提高,人们都在追求着通信的更高目标——在任何时候、任何地点、与任何人都能及时沟通联系,交流信息。单靠办公室和家庭内的固定通信,是无法满足这一需要的。因此,现代通信的一条重要支柱——移动通信,便日益显示出其迫切性和重要性。移动通信已有几十年的发展历史,最初只用于海上通信。第二次世界大战中,雷达技术
With the increase of human political and economic activities and the continuous improvement of efficiency, people are pursuing the higher goal of communication - to communicate with and exchange information with anyone at any time, anywhere. It is not possible to meet this need by relying solely on fixed communications within the office and at home. Therefore, one of the important pillars of modern communications, mobile communications, has increasingly shown its urgency and importance. Mobile communications have decades of history and were initially used only for maritime communications. During the Second World War, radar technology