原创,无线网络信道接入方法最全总结,干扰管理技术总结.ppt

* * * * * Mobile Computing Summer 2002 Distributed Computing Group, Roger Wattenhofer * * Mobile Computing Summer 2002 Distributed Computing Group, Roger Wattenhofer * * Mobile Computing Summer 2002 Distributed Computing Group, Roger Wattenhofer * Mobile Computing Summer 2002 Distributed Computing Group, Roger Wattenhofer * Mobile Computing Summer 2002 Distributed Computing Group, Roger Wattenhofer * Mobile Computing Summer 2002 Distributed Computing Group, Roger Wattenhofer * Mobile Computing Summer 2002 Distributed Computing Group, Roger Wattenhofer * * Ad Hoc and Sensor Networks – Roger Wattenhofer – 6/* Ad Hoc and Sensor Networks – Roger Wattenhofer – 6/* Ad Hoc and Sensor Networks – Roger Wattenhofer – Ad Hoc and Sensor Networks – Roger Wattenhofer – 6/* Ad Hoc and Sensor Networks – Roger Wattenhofer – Ad Hoc and Sensor Networks – Roger Wattenhofer – 6/* Stefan Schmid, ETH Zurich @ WPDRTS 2006 Ad Hoc and Sensor Networks – Roger Wattenhofer – 6/* Distributed Computing Group MOBILE COMPUTING R. Wattenhofer Ad Hoc and Sensor Networks – Roger Wattenhofer – 6/* Distributed Computing Group MOBILE COMPUTING R. Wattenhofer 无线网络信道接入方法 TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: AAAAAAAA 紫泉1897 QQ 562687381 无线信道接入方法分类 基于非竞争 基于竞争 (固定接入) (随机接入) TDMA FDMA CDMA SDMA ALOHA CSMA/CA 干扰避免 (认为干扰 是有害的) 干扰利用 (认为干扰 是有益的) 干扰对齐 (IA, interference alignment) 干扰消除 (IC, interference cancellation) 迫零编码，物理层网络编码… 相继干扰消除… 允许并发传输 Eg: 903…. Eg: Wifi, 蓝牙, Zigbee…. Eg:蜂窝网… Eg:联通CDMA… Eg: OFDMA (LTE, WiMax) 世界最早的无线电计算机网络 信道接入方法：无线网络研究的核心 无线通信 (wireless communication) ： 提高信道容量 无线网络 (wireless networking) ：协调众多节点对共享信道的接入，即“瓜分”信道 本质上是一个资源分配问题。信道资源的稀缺性和用户数的剧烈增长对如何分好“蛋糕”提出了更高的要求 主要限制：干扰 (interference) . 干扰：(可能是) 无线信道与有线信道最本质的区别 A B C D Motivation Can we apply media access methods from fixed networks? No !!! Problems in wireless networks broadcast nature of wireless channel— 干扰 (in