Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Sniffing Out the Correct Physical Layer Capture Model in 802.11b
ICNP '04 Proceedings of the 12th IEEE International Conference on Network Protocols
Methods for restoring MAC layer fairness in IEEE 802.11 networks with physical layer capture
REALMAN '06 Proceedings of the 2nd international workshop on Multi-hop ad hoc networks: from theory to reality
An experimental study on the capture effect in 802.11a networks
Proceedings of the second ACM international workshop on Wireless network testbeds, experimental evaluation and characterization
Using physical layer emulation to understand and improve wireless networks
Using physical layer emulation to understand and improve wireless networks
Experimental characterization of sectorized antennas in dense 802.11 wireless mesh networks
Proceedings of the tenth ACM international symposium on Mobile ad hoc networking and computing
Improved modeling of IEEE 802.11a PHY through fine-grained measurements
Computer Networks: The International Journal of Computer and Telecommunications Networking
A site-specific indoor link model for realistic wireless network simulations
Proceedings of the 4th International ICST Conference on Simulation Tools and Techniques
Measurement-based simulation of WiFi interference
Proceedings of the 16th ACM international conference on Modeling, analysis & simulation of wireless and mobile systems
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In simulating wireless networks, modeling of the physical layer behavior is an important yet difficult task. Modeling and estimating wireless interference is receiving great research attention, and is crucial in a wireless network performance study. The implementation of physical layer capture, preamble detection, and carrier sense threshold plays an important role in successful frame reception in the presence of interference. We showed in our previous testbed study that the operations of the frame reception and the capture effect in real IEEE 802.11a systems differ from those of popular research simulators. We present our modifications of the IEEE 802.11a PHY models to the current simulators. The modifications can be summarized as follows. (i) The current simulators' frame reception is based only on the received signal strength. However, the real 802.11 systems can start the frame reception only when the Signal-to-Interference Ratio (SIR) is high enough to detect the preamble. (ii) Different chipset vendors implement the frame reception and capture algorithms differently, resulting in different operations for the same event. We provide different simulation models for several popular chipset vendors and show the performance differences between the models. (iii) The current simulators set the carrier sense threshold equal to the receiver sensitivity. The standard however states that it should be 20 dB higher than the receiver sensitivity. We implement our modifications to the QualNet simulator and conduct a wireless network performance study to evaluate the impact of PHY model implementation.