In-home Power Line Communication Media Access Control Protocol Based on Collision Resolution

Most existing media access control(MAC) protocols in power line communication(PLC) networks just discard the colliding data packets when collision occurs.The collision deteriorates throughput and delay performance of system under high traffic conditions.This article presents a novel media access scheme with fast collision resolution for in-home power line networks.It works by first recognizing the colliding stations through detecting the inserted unique ID sequence ahead of data packets,then the source nodes retransmitting their packets immediately after the collision slot.The proposed protocol maintains the benefits of ALOHA systems.It needs no scheduling overhead and is suitable for bursty sources,such as multimedia data packets.Computer simulations have demonstrated that this approach can achieve high throughput due to its ability of resolving collisions.

电力线载波通讯模块在机器人控制技术中的应用

机器人控制中通讯是必不可少的技术环节,现有通讯方式可分为有线与无线两种。无线通讯不必配置专用的通讯线缆,但抗空间电磁干扰能力低,受无线电管制约束。有线通讯可靠性高,但需配备专用的通讯电缆。近年发展起来的电力线载波通讯技术为机器人控制技术提供了新的通讯手段。电力线载波通讯使用公用的电力线,不必专门铺设通讯电缆,系统得以简化,因而大大提高了机器人设计与制造的性能价格比。本文结合工程实践,采用了美国Intellon公司的电力线载波通讯模块SSC P200与单片机结合组成了实用系统,实际运行表明电力线载波通讯技术应用在机器人控制中是行之有效的。