System-level Modeling and Performance Analysis of Wireless Access System
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摘要: 为了分析IEEE 802.11协议中主要参数对无线接入系统性能的影响以及设计低成本的无线接入点(access point,简称为AP),按照复杂嵌入式系统的系统级设计流程,在AP的软/硬件实现之前使用形式化建模语言POOSL建立了无线接入系统的抽象模型.定量地分析了最小竞争窗口(CWmin)等参数对有效吞吐量和平均延时等性能指标的影响,通过分析CPU利用率,确定了合适的CPU处理速度.结果表明:在系统设计的早期阶段通过系统级建模及性能分析,可以确定系统设计的关键参数.Abstract: The wireless access point(AP)is a key device in wireless LAN(local-area network),and its performance influences the data transmission quality strongly.To analyze the impacts of the main parameters in the IEEE 802.11 protocol on the wireless access system and design low-cost AP,an abstract model of wireless access system is built according to system design flow of complex embedded system before the hardware/software of AP is actually realized.Based on the simulation of the model,the influence of the parameter CWmin(minimum contention window)on the performance metrics such as valid throughput and average frame delay were analyzed.The appropriate processing speed of CPU is also confirmed by analyzing the CPU occupancy.The results show that the key design parameters can be determined through system-level modeling and performance evaluation in the earliest design phases.
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Keywords:
- simulation /
- performance evaluation /
- embedded systems /
- access point
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