A new approach to high-capacity digital mobile Radio
A new approach to high-capacity digital mobile Radio
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高容量数字移动无线电的新方法
DOI：
10.1002/j.1538-7305.1981.tb00301.x
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发表时间：
1981
影响因子：
--
通讯作者：
B. Glance
中科院分区：
文献类型：
--
作者：
P. Henry;B. Glance
空间分集(自适应相控阵天线)是对抗蜂窝移动无线电系统中同频干扰的有效武器。通过使用时分重传，可以以适度的硬件复杂度实现高阶分集，并因此实现强干扰抑制。利用这种特别适合于数字调制方法的技术，空间分集所需的自适应信号处理可以仅在通信链路的一端即基站执行。在另一端(移动单元)，只需要一个单元件天线。此外，在这样的系统中使用相干相移键控允许简单的RF电路，因为自适应处理是在基带完成的。在蜂窝移动无线电环境中，即使在存在小区间干扰、Ray Leigh衰落(平坦和频率选择性)和阴影衰落的情况下，每个小区的空间分集、时分重传和120度角落照明的组合也可以产生可靠的通信信道。这些技术的使用允许每个小区(每个小区32kb/S)在850-MHz移动无线电频段的40-MHz带宽内容纳大约130个双向信道。
Space diversity (adaptive phased-array antennas) is an effective weapon against the cochannel interference encountered in cellular mobile radio systems. High-order diversity, and hence, strong interference suppression, can be achieved with modest hardware complexity by using time-division retransmission. With this technique, which is especially well-suited to digital modulation methods, the adaptive signal processing required for space diversity can be performed at just one end of the communication link, namely, the base station. At the other end (the mobile unit) only a single-element antenna is needed. Moreover, the use of coherent phase-shift keying in such a system allows simple RF circuity, because the adaptive processing is done at baseband. In the context of cellular mobile radio, the combination of space diversity, time-division retransmission and 120-degree corner illumination of each cell can yield a reliable communication channel even in the presence of intercell interference, Ray leigh fading (both flat and frequency-selective), and shadow fading. The use of these techniques allows approximately 130 two-way channels per cell (at 32 kb/s each) to be accommodated in the 40-MHz bandwidth of the 850-MHz mobile radio band.