电子学报2012，Vol.40Issue(7)：1333-1338,6.DOI:10.3969/j.issn.0372-2112.2012.07.008
一种关联SNR的停等DCF优化方案
An SNR Aware Stop and Wait DCF Optimization Method
摘要
Abstract
A method of DCF (Distributed Coordination Function) optimization-Stop and Wait DCF integrated with the rate control and its performance analysis model are proposed in order to increase the effective throughput.SNR (Signal to Noise Ratio) thresholds of rate control are determined by tuning the BER (Bit Error Rate) of frame with the help of AMC (Adaptive Modulation and Coding) technology. When the SNR is below the lowest threshold, the DCF backoff process stops and waits till the channel SNR becomes big enough again. Therefore the transmission error could be decreased.Meanwhile, the access collision could be reduced either. Since the channel time, collision probability and frame error rate are changed differently as tuning BER,maximized throughput can be get at the tradeoff point of these parameters. The analysis and simulation indicate that the proposed model is accurate. The problem without packet loss differentiation is overcome and the cross layer optimization is implemented.关键词
IEEE802.11/DCF/速率控制/自适应调制编码/优化Key words
IEEE 802.11/ distributed coordination function(DCF)/ rate control/ adaptive modulation and coding/ optimization分类
信息技术与安全科学引用本文复制引用
李志杰,方旭明..一种关联SNR的停等DCF优化方案[J].电子学报,2012,40(7):1333-1338,6.基金项目
国家自然科学基金(No.60772085,No.61071108) （No.60772085,No.61071108）
中央高校基本科研业务费专项资金(No.SWJTU09ZT14) （No.SWJTU09ZT14）
