摘要：Major consideration dimensions for the physical layer design of wireless sensor network （WSN） nodes is analyzed by comparing different wireless communication approaches, diverse mature standards, important radio frequency （RF） parameters and various microcontroller unit （MCU） solutions. An implementation of the WSN node is presented with experimental results and a novel ＂one processor working at two frequencies＂ energy saving strategy. The lifetime estimation issue is analyzed with consideration to the periodical listen required by common WSN media access control （MAC） algorithms. It can be concluded that the startup time of the RF which determines the best sleep time ratio and the shortest backoff slot time of MAC, the RF frequency and modulation methods which determinate the RX and TX current, and the overall energy consumption of the dual frequency MCU SOC （ system on chip） are the most essential factors for the WSN node physical layer design.

摘要：多点识别是远距离射频识别系统中一个关键问题.本文针对多点识别问题提出了一种采用两级窗口退避策略的MAC通信协议.文中分析和推导出了协议状态机中时间参数间的数学约束关系,通过仿真得出了碰撞概率以及不同情况下的平均检测时间.

摘要：MPC8 5 2T是Motorola新近推出的MPC86 6 /MPC85 9T家族中面向低端的一款通信处理器。嵌入式Linux由于其费用低廉及开放源码而具有广阔的发展前景。文中在分析了MPC85 2T通信处理器和嵌入式Linux操作系统的基础上 ,将二者结合给出了一种嵌入式硬件系统的设计与实现 ,以及该硬件系统在无线局域网WLAN中的一种应用。实践证明 ,该硬件系统具有性能稳定、廉价、可扩展性强。