同时指出，陆地移动通信技术解决方案完全可以解决煤矿井下无线通信难题。
Also the solutions for mobile communication technology at surface ground can be fully to solve the wireless communication problems in underground mine.
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.
而相比于陆地移动通信，海上无线通信受气候、海浪等因素影响较大。
Comparing to the land mobile communication, marine wireless communication is easily deteriorated by climate and seawave.
而相比于陆地移动通信，海上无线通信受气候、海浪等因素影响较大。
Comparing to the land mobile communication, marine wireless communication is easily deteriorated by climate and seawave.
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