计算机工程Issue(7)：63-66,4.DOI:10.3969/j.issn.1000-3428.2014.07.012
NS-2无线物理层实现与衰落功能扩展研究
Study on NS-2 Wireless Physical Layer Implementation and Fading Function Extension
摘要
Abstract
This paper studies the implementation of packets transmission and reception of the NS-2 wireless physical layer by tracing its C++ classes, which offers a guideline to extend the NS-2 wireless functionality. As NS-2 only implements an ideal channel without considering channel fading, the paper gives the general computation method of fading in NS-2 and implements Rayleigh fading as an example. The performance of UDP and TCP flows under Rayleigh fading is different from those without fading, which simulates the uncertainty of wireless transmissions. The throughputs of a single link decrease as the link length increases. In Wireless Local Area Networks(WLAN), the throughputs of the nodes far from the AP are affected significantly by fading causing throughputs degradation, while the throughputs of the nodes nearby the AP are affected slightly by fading and its throughput increases due to bandwidth sharing. Simulation result shows that the fading extension in NS-2 makes wireless network protocols more accurately than before.关键词
NS-2网络模拟器/信道衰落/吞吐量/公平性/物理层/802.11无线局域网Key words
NS-2 network simulator/channel fading/throughput/fairness/physical layer/802.11 Wireless Local Area Networks (WLAN)分类
信息技术与安全科学引用本文复制引用
王悦,刘灿涛,朱雷,张书云..NS-2无线物理层实现与衰落功能扩展研究[J].计算机工程,2014,(7):63-66,4.基金项目
国家自然科学基金资助项目(61309030,61100112)；教育部人文社会科学研究青年基金资助项目(11YJCZH006)；北京市哲学社会科学规划基金资助项目(12JGA014,13JGA004)；中央财经大学学科建设基金资助项目。 （61309030,61100112）
