NEW DIGITAL MOBILE RADIO TECHNOLOGIES

被引：0
|
作者：
SHIMIZU, I
SAITO, S
CHIBA, K
TARUSAWA, Y
YAMAO, Y
机构：
来源：
NTT REVIEW | 1992年 / 4卷 / 01期
关键词：
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In order to develop a digital mobile radio unit it is necessary to achieve highly precise and efficient pi/4 shifted QPSK transmission in a TDMA burst RF channel. This paper discusses the configuration of a digital mobile radio and explain the prerequisite conditions for its various sub-systems. Next, as new fundamental element in the mobile radio technologies, we propose an RF quadrature modulator, adaptive carrier tracking demodulator, linearized saturation amplifier with bi-directional feed control, as well as a digital loop preset synthesizer. Also, the configuration of each of the above and their superior features are demonstrated. In addition, the efficacy of these basic sub-system technologies in designing compact and low power consumption mobile radio units is shown.
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页码：64 / 69
页数：6
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