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
Understanding the real-world performance of carrier sense
Proceedings of the 2005 ACM SIGCOMM workshop on Experimental approaches to wireless network design and analysis
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
Measurement-based models of delivery and interference in static wireless networks
Proceedings of the 2006 conference on Applications, technologies, architectures, and protocols for computer communications
Experimental study of concurrent transmission in wireless sensor networks
Proceedings of the 4th international conference on Embedded networked sensor systems
Using emulation to understand and improve wireless networks and applications
NSDI'05 Proceedings of the 2nd conference on Symposium on Networked Systems Design & Implementation - Volume 2
Exploiting the capture effect for collision detection and recovery
EmNets '05 Proceedings of the 2nd IEEE workshop on Embedded Networked Sensors
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
Overhaul of ieee 802.11 modeling and simulation in ns-2
Proceedings of the 10th ACM Symposium on Modeling, analysis, and simulation of wireless and mobile systems
ns2-MIRACLE: a modular framework for multi-technology and cross-layer support in network simulator 2
Proceedings of the 2nd international conference on Performance evaluation methodologies and tools
A case for adapting channel width in wireless networks
Proceedings of the ACM SIGCOMM 2008 conference on Data communication
Revamping the IEEE 802.11a PHY simulation models
Proceedings of the 11th international symposium on Modeling, analysis and simulation of wireless and mobile systems
Opportunities of MIM capture in IEEE 802.11 WLANs: analytic study
Proceedings of the 5th International Conference on Ubiquitous Information Management and Communication
Partial interference and its performance impact on wireless multiple access networks
EURASIP Journal on Wireless Communications and Networking
WiFi-Nano: reclaiming WiFi efficiency through 800 ns slots
MobiCom '11 Proceedings of the 17th annual international conference on Mobile computing and networking
XPRESS: a cross-layer backpressure architecture for wireless multi-hop networks
MobiCom '11 Proceedings of the 17th annual international conference on Mobile computing and networking
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In wireless networks, modeling of the physical layer behavior is an important yet difficult task. Modeling and estimating wireless interference is receiving great attention, and is crucial in a wireless network performance study. The physical layer capture, preamble detection, and carrier sense threshold are three key components that play important roles in successful frame reception in the presence of interference. Using our IEEE 802.11a wireless network testbed, we carry out a measurement study that reveals the detailed operation of each component and in particular we show the terms and conditions (interference timing, signal power difference, bitrate) under which a frame survives interference according to the preamble detection and capture logic. Based on the measurement study, we show that the operations of the three components in real IEEE 802.11a systems differ from those of popular simulators and present our modifications of the IEEE 802.11a PHY models to the NS-2 and QualNet network simulators. The modifications can be summarized as follows. (i) The current simulators' frame reception is based only on the received signal strength. However, real 802.11 systems can start 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) Based on the 802.11a standard setting and our testbed observation, we revise the simulator to set the carrier sense threshold higher than the receiver sensitivity rather than equal to the receiver sensitivity. We implement our modifications to the QualNet simulator and evaluate the impact of PHY model implementations on the wireless network performance; these result in an up to six times increase of net throughput.