扩频技术在数字蜂窝移动通信系统、卫星移动通信、室内无线通信和未来的个人通信中被广泛采用。

Spread Spectrum technique is widely used in digital cell-phone mobile communication system, satellite mobile communication, inside wireless communication and future personal communication.

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研究了陆地集群无线通信（TETRA）数字集群移动通信系统的语音压缩编解码算法的基本原理。

This paper describes the basic theory of speech compression encoding and decoding algorithm in TETRA (terrestrial trunked radio) system.

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本系统采用时分制设计思想，将GPS接收机、帧格式转换器、通讯模板和数字电台组成一个整体，构成无线通信网络并与电子地图相结合完成对移动装备的管理。

This system applies the time divided multiplexing method and integrates GPS receiver, translator, communication controller and mobile station to form a radio communication network. It works with el…

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