ieee_802.15.4协议原理与应用.ppt

Zhongyuan University of Technology IEEE 协议原理与应用张书钦 zsqheu@ Principles and Application of IEEE Zhongyuan University of Technology 提纲一一三三 概述 CC2430 二二 主要特征四四 IEEE 数据速率的估算 概述 Why choose IEEE : ? Industrial standard for LR- WPANs ? Coexistence with WLAN due to DSSS ? Duty-cycle adjustable ? GTS for real-time applications ? Provide security mechanism IEEE 不同版本 This will define new PHYs for smart neighbourhood networks. These may include applications such as smart grid applications for the energy industry. It may include the 902 - 928 MHz band. IEEE This will define new PHYs for UWB, GHz band and also 433 MHz IEEE This release defines MAC enhancements to IEEE in support of the ISA application. IEEE GHz, 868 MHz, 915 MHz and Japanese 950 - 956 MHz band. IEEE Updates for GHz, 868 MHz and 915 MHz, UWB and the China 779-787 MHz band. IEEE This version of the IEEE standard defined two new PHYs . One used UWB technology and the other provided for using chirp spread spectrum at GHz. IEEE This 2006 release of the IEEE standard provided for an increase in the data rate achievable on the lower frequency bands. This release of the standard updated the PHY for 868 and 915 MHz. It also defined four new modulation schemes that could be used - three for the lower frequency bands, and one for GHz. IEEE - 2006 This was the initial release of the IEEE standard. It provided for two different PHYs - one for the lower frequency bands of 868 and 915 MHz, and the other for GHz. ------ ZigBee 使用的是这个版本。 IEEE - 2003 Details ments IEEE Version Zigbee/ 和蓝牙的对比 5美元 2美元最低单位成本数据+语音数据业务范围 3s 15ms 设备激活时间前向纠错差错检测/重传纠错机制轮询-答复 CSMA/CA 接入方式是否实时特性点对点主从星型/点对点/簇树,及其混合拓扑结构<10m 10~75m 覆盖范围 FHSS DSSS 调制方式 720kb/s 250kb/s 峰值速率 2.