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Validation of the IEEE 802.11 Wifi implementation for OFDM-based communication

Validation of the IEEE 802.11 Wifi implementation for OFDM-based communication
Tagung:Workshop on NS-3, in conjunction with SIMUTools 2010 Links:Download der Vortragsfolien
Tagungsort:Malaga, Spain
Referent:Jens Mittag, Patrick Armbruster


One of the most often used standards for wireless communication systems and wireless communication research is the IEEE 802.11 standard. Consequently, a lot of different approaches to model the physical and medium access layer of that standard exist and have been implemented in most modern and recent network simulators - including NS-3. While the medium access layer mechanisms are reflected exactly as defined by the standard in those simulators, the physical layer is commonly simplified and individual bits are neglected by the consideration of a frame as the smallest atom of the simulation. As a result, such simulators can not account accurately enough for effects such as fast-fading and multi-tap radio channels, effects that are encountered if the environment is changing or the nodes are moving rapidly. To quantify the level of inaccuracy introduced by this simplification and to study the difference to real IEEE 802.11 chipsets, in particular chipsets for OFDM-based communication, we have validated the PHY models behind the NS-3 Wifi module against the wireless network emulator testbed of the Carnegie Mellon University in Pittsburgh, a testbed using Atheros based WLAN cards, and an own implementation of a complete IEEE 802.11 transceiver in software. In this talk, we will focus on the presentation and discussion of the obtained results.