Link-to-System Mapping for ns-3 Wi-Fi OFDM Error Models
Link-to-System Mapping for ns-3 Wi-Fi OFDM Error Models
复制标题
ns-3 Wi-Fi OFDM 误差模型的链路到系统映射
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Amrutha Chandramohan
中科院分区：
文献类型：
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作者：
Rohan Patidar;S. Roy;T. Henderson;Amrutha Chandramohan
ns-3模拟器包含Wi-Fi MAC层的详细模型，包括信标、速率控制、冲突避免、块消除和许多其他功能。然而，它依赖于物理层的抽象来进行良好的扩展; Wi-Fi帧由专门的干扰跟踪器和分析误差模型进行评估，以逐帧而不是逐符号地得出帧接收决策。分析模型可以为简单场景（具有单天线和有限干扰的加性白色高斯噪声（AWGN）信道）提供相当严格的边界，但行业依赖于详细的链路级仿真来理解更复杂的场景。本文报告了一项广泛的活动，使用支持Wi-Fi的商业链路模拟器在AWGN和衰落信道上进行Wi-Fi OFDM性能的链路模拟，并根据已发表的参考文献对结果进行了验证。接下来，我们描述通常称为链路到系统映射的技术的具体实现，以允许将每子载波信噪比的向量提取为单个"有效SNR"值，该值可用于使用AWGN信道的链路仿真结果来确定性能。最后，我们报告的支持我们的链路仿真结果在一个新的ns-3 ErrorRateModel的基础上，从链路仿真结果编译表。我们更广泛的贡献是链路模拟程序本身，它允许其他人复制和扩展我们提供的基本表，以及ns-3实现的灵活性，允许随着时间的推移添加额外的表。
The ns-3 simulator contains detailed models of the Wi-Fi MAC layer, including beaconing, rate control, collision avoidance, block acknowledgments, and many other features. However, it relies on abstraction at the physical layer to scale well; Wi-Fi frames are evaluated by specialized interference trackers and analytical error models to arrive at frame reception decisions on a frame-by-frame basis, rather than symbol-by-symbol. Analytical models can provide fairly tight bounds for simple scenarios (additive white Gaussian noise (AWGN) channels with single antennas and limited interference), but the industry relies on detailed link-level simulations to understand more complicated scenarios. This paper reports on an extensive campaign to conduct link simulations of Wi-Fi OFDM performance over AWGN and fading channels, using a commercial link simulator with Wi-Fi support, with results validated against published references. Next, we describe a specific implementation of a technique generally known as link-to-system-mapping, to allow a vector of per-subcarrier signal-to-noise ratios to be distilled into a single "effective SNR" value that can be used to determine performance using link simulation results of the AWGN channel. Finally, we report on the support of our link simulation results in a new ns-3 ErrorRateModel based on tables compiled from link simulation results. Our broader contributions are the link simulation programs themselves which allow others to reproduce and extend the basic tables that we provide, and flexibility in the ns-3 implementation to allow additional tables to be added over time.