用单片机控制的多信道、数字信令式无中心拨号系统(DCL系统)

Multichannel Digital command Dialling System without Central Station Controlled by a Single-Chip Microcomputer

本文介绍了采用MCS-51系列单片机——8031做为控制单元,实现移动电台的多信道、数字信令式无中心台拨号系统的原理与设计。此系统采用扫描空闲信道方式,实现了信道复用,有效地提高了频率利用率,并扩展了原电台的信道数。在相同的呼损率下,通信网内可容纳更多的用户。可望缓解频率资源日趋紧张的局面。此系统具有硬件简单,软件功能强的特点,从而提高了系统的可靠性与实用性。此系统适用于150MHz,400MHz,900MHz等带数字频率合成器的电台组成通信网。

In this paper, a design of multichannel digital command dialling system controlle by a MCS-51 single-chip microcomputer without centrel station (i.e. DCL system) in mobile radio communication is introduced. In this system, the common use of multichannel is realized by a search for a free channel. The efficienty of channel is greatly increased. The number of channel is also increased. Comparing of a DCL system with a old one, the DCL system can contain more users in a communication network in the same percent of call lost. The resource of radio frequency can be utillized efficiently and reasonably. In this system, the hardware is simple but soffware is multifunctional. So the reliability of the system is higher and the system is good practice. This system can be used in 150 MHz, 400 MHz and 900 MHz etc. radio with digital freqency synthesizer. This system was suceeded in JZD 150 MHz radio made in yunnan Radio Factory.