第一代移动通信系统(1g)是模拟制式的蜂窝移动通信系统，主要提供话音服务。
The first generation of mobile communication systems (1g) was analog cellular system for mobile communication standard with the main voice services.
与传统的模拟集群移动通信系统相比，TETRA具有更高的频谱利用率，提供更广泛的业务服务。
Compared with the traditional analog trunked ra-dio, TETRA is more spectrum efficient and can provide extensive services.
第一代移动通信系统（1G）是模拟制式的蜂窝移动通信系统，主要提供话音服务。
The first generation of mobile communication (1G) is cellular mobile communication based on analog signal, and it mainly provides voice service.
传统的单边带语音通信系统大都是模拟的，实现起来比较复杂，往往由于庞大而不便移动和调试。
Traditional SSB system was analogue, it was difficult to realize, and it always too big to be moved and test.
传统的单边带语音通信系统大都是模拟的，实现起来比较复杂，往往由于庞大而不便移动和调试。
Traditional SSB system was analogue, it was difficult to realize, and it always too big to be moved and test.
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