无线Ad hoc网络一种最小化链路干扰的载波监听机制设计  

A Carrier Sensing Scheme Based on the Minimized Interference in Wireless Ad hoc Networks

作　　者：邱国庆[1] 夏晶晶[1] 

机构地区：[1]中国科学技术大学计算机科学与技术学院

出　　处：《电子技术（上海）》2011年第8期71-73,70,共4页Electronic Technology

基　　金：中国科学院研究生科技创新与社会实践资助专项资助

摘　　要：无线Ad hoc网络中,干扰产生于接收节点处的接收信号被其他无用信号叠加,干扰问题严重影响接收端解码信息的能力,导致数据包冲突和重传的增加。如何最小化链路干扰,减少数据包冲突概率,是提高网络性能的关键。MAC协议中,合理的载波监听机制是减小链路干扰的有效方式之一,通过合适的感知门限设计,可以有效地降低链路中的干扰和冲突,提高网络吞吐量。文章提出一种最小化链路干扰的载波监听机制,该机制根据链路的实际状况对接收节点的干扰范围进行计算,进而使得发送节点调节合适的感知门限值,使发送节点可以感知到所有干扰节点,进而最小化链路干扰。模拟结果显示,本文提出的机制能有效地提高网络吞吐量,最小化数据包冲突概率和链路中存在的干扰。In Ad hoc networks,interference generates from the received signals at receiving nodes superimposed by unwanted signals,which seriously affects the ability of decoding received data packets at receiving ends,and resulting in the increasing of packets collision and retransmissions.It is a key for improving network performance to minimize link interference,reduce the probability of packets collision.In MAC protocol,rational carrier sensing scheme is one of the effective ways to reduce link interference,thus,the carrier sensing threshold adjustment can effectively reduce the interference and collision in links,thereby improving the network throughput.This paper proposes a carrier sensing scheme based on minimizing link interference,in which the interference range of receiving nodes is calculated according to the actual situation of the link,and then the sending nodes set a reasonable carrier sense threshold,so as to sense all the interference nodes and minimize the link interference.Simulation results show that the proposed scheme can effectively increase the throughput and minimize the collision probability and interference in the links.

关 键 词：无线AD HOC网络 干扰 冲突 载波监听 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构]