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本文叙述一种VHF和UHF地面移动电话用的数字调制技术。首先说明用于VHF和UHF地面移动信道中作为窄带数字话音传输的话音编码和数字调制的要求,然后通过陈述满足这些要求的数字调制方法的可实现性,并由一些实验结果证实,来阐述数字移动电话的可能性。另外,还例举了将来需待解决的遗留技术问题。
This article describes a digital modulation technique for VHF and UHF terrestrial mobile phones. First, the requirements for speech coding and digital modulation for narrowband digital voice transmission in VHF and UHF terrestrial mobile channels will be explained. Then, the feasibility of the digital modulation method to meet these requirements will be demonstrated and verified by some experimental results to elaborate the numbers Possibility of mobile phone. In addition, there are examples of legacy technical issues that need to be addressed in the future.