基于ZigBee的低延时PDA网络系统设计与实现

Low Latency Interactive Self-help Information Query Platform Design

摘要:

传统的自助信息服务系统(PDA)终端平台设备只具有简单的读写功能,网络互动能力较差,在文件传输中出现较大的数据流时会造成明显的网络延时；设计并实现了基于ZigBee网络的终端PDA平台系统设计；在平台设计中,引入了主从CPU轮流方式,分担设备交互中产生的海量数据流,在外围电路中,设计了专用的SD存储卡,便于数据移植；在原有的平台无线传输模块中,进行了链路升级,采用分级路由机制,有效降低数据包的路由延时。并以教学PDA为例进行开发与试验,系统测试表明:文章设计的自助信息服务系统PDA网络下行发送数据在10 ms可以完成,误码率为0.001%,上行发送数据成功率高达99.7%；证明该系统具有稳定的网络性能与实用性；具有较高的网络稳定性和很强的实用价值。

Abstract:

Traditional classroom teaching equipment has a simple to read and write function, network interactive ability is poorer, because the larger data in the file transfer flow cause apparent network latency, in this paper, a class terminal PDA system based on ZigBee network, designed the master-slave CPU work by turns, optimize share the data flow in the classroom interaction, based on ZigBee technology to realize the terminal equipment of the wireless connection, in the peripheral circuit design the dedicated SD memory card, is advantageous for the data migration, wireless transmission module in the original link upgrades in the ZigBee network protocol, uses hierarchical routing mechanism, reduce the packet routing delays. PDA network in different area of the classroom teaching experiments downward to send data can be completed in 10 milliseconds and bit error rate is 0.001%, ascending to send data 99.7% success rate. It proved that the system has a stable network performance and practicality.