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This is a wiki page for the Channel special-interest area.

Channel Area Overview

The Channel special interest area is designed to encourage the contribution of radio channel and PHY-layer measurement data and data processing tools to the CRAWDAD repository, and to provide a centralized location within the repository for such wireless channel measurements. The Channel area will focus on channel measurement data sets which can be useful in measurement-based simulations or analysis of wireless network protocols, algorithms, security methods, and applications.

Channel data sets include measurements of physical layer, including radio channel, modulation, bit and packet error rates, and noise and interference measurements. For example

• Radio Channel Measurements: received signal strength (incl. interference power); spectrum occupancy; channel impulse, frequency, or phase response; time-of-arrival or angle-of arrival.
• Error Rates: link quality, packet or bit error rates.
• Location: actual device locations, or location measurements (e.g. GPS).
• Connectivity: a function of the above -- measurements of the ability of two radios to communicate.

Some of the useful measured data sets contain a combination of related measurements, on many links, over time, on different frequencies or with differing antenna heights, with motion of nodes, and along with higher-layer packet or link data.

The measured channel data is helpful in evaluation of many applications, including: localization, robustness, performance, and network coverage. Measured radio channel and physical layer data sets which can be used to address these and other wireless network performance characteristics are the focus of the Channel special interest area.

CRAWDAD data sets or tools for channel or PHY-layer information

Here is a list of existing CRAWDAD data sets containing channel or PHY-layer information (or tools to help such data):

Radio Contact / Connectivity of Mobile Devices

• dartmouth/wardriving (v. 2006-06-02): Location-aware dataset for analyzing the errors in location estimates
• intel/placelab (v. 2004-12-17): Location-aware dataset collected using Place Lab software
• microsoft/vanlan (v. 2007-09-14): WiFi connectivity and GPS coordinates for a mobile WiFi device.
• nus/bluetooth (v. 2007-09-03): Dataset of Bluetooth contact traces collected in Singapore (2005-6).
• uw/places(v. 2006-05-02): Location-aware dataset for extracting significant places

Chahttp://crawdad.cs.dartmouth.edu/wiki/pmwiki.php?n=Main.Channel?action=edit

CRAWDAD Wiki | Main / Channelnnel Phase or Impulse Responses

• utah/CIR (v. 2007-09-10): Measured CIR (Channel Impulse Response) Data Set
• vanderbilt/interferometric (v. 2007-06-06): Localization data set collected from a radio interferometric tracking system.

Channel Signal Strength, Link Quality Measurements

• umich/virgil (v. 2008-03-28): WiFi access point data (signal strength, accessibility, link quality) collected by walking through every street in several different city neighborhood areas in Chicago and other US cities.
• dartmouth/zigbee_radio (v. 2008-01-07): RSSI, LQI, and throughput measurements in three mobile 802.15.4 person-to-person communications experiments.
• isti/rural (v. 2007-12-19): Data set of measured link path length vs. packet loss rate on a Wi-Fi network in rural areas.
• [[http://crawdadhttp://crawdad.cs.dartmouth.edu/wiki/pmwiki.php?n=Main.Channel?action=edit

CRAWDAD Wiki | Main / Channel.cs.dartmouth.edu/mannheim/compass | mannheim/compass (v. 2006-09-13)]]: Traces of signal strength of 802.11 APs for the COMPASS (fingerprint-based) positioning system

• microsoft/osdi2006 (v. 2007-05-23): Traces of network activity at OSDI 2006
• nist/multihop (v. 2007-08-20): Dataset of experiments measuring signal strength for 900 MHz wireless nodes at various antenna heights, for a multihop wireless network.
• uw/sigcomm2004 (v. 2006-10-17): Dataset of wireless network measurement in SIGCOMM 2004 conference
• umass/long_distance (v. 2007-06-01): Dataset of throughput of links in several configurations of ad hoc 802.11g networks with high-gain antennas on nodes.

Channel Interference / Medium Access Control Measurements

• rutgers/capture (v. 2007-04-20): Dataset containing RFMON (wireless monitoring) traces capturing transmitted MAC frames on the ORBIT testbed

Position of Mobile Nodes

• nottingham/cattle (v. 2007-12-20): Dataset of GPS-based cattle movement and behavior monitoring collected at the University of Nottingham's Dairy Centre.

Tools

• tools/collect/802.11/wrapi_plus (v. 2005-05-10): A tool for monitoring wireless statistics in real-time
• tools/process/pcap/wifi_parser (v. 2007-11-05): A tool for selectively printing out header fields/flags from either live or recorded 802.11 traffic
• loclib, loctrace, locana, loceva: "Loc{lib,trace,eva,ana}: Research tools for 802.11-based positioning systems"

Channel Area Editor

Dr. Neal Patwari is the Channel Area Editor for the CRAWDAD project.

If you have any Channel/PHY-layer data sets (or tools to help process such data), we encourage you to contact Neal to discuss contributing these to CRAWDAD.

Short Bio: Neal received his B.S.(`97) and M.S.(`99) in Electrical Engineering from Virginia Tech, in Blacksburg, VA, where was a researcher at the Mobile & Portable Radio Research Group (MPRG). Between 1999 and 2001, he was a research engineer at Motorola Labs, Florida Communications Research Lab, in Plantation, FL. He received a Ph.D. in Electrical Engineering from the University of Michigan EECS Department in September, 2005. His PhD research and post-doctoral research was supervised by Prof. Alfred O. Hero. Neal is currently an assistant professor in the University of Utah Department of Electrical and Computer Engineering, which he joined in August, 2006. He directs the Sensing and Processing Across Networks Lab at the University of Utah, and has over thirty publications in refereed conferences, journals, and edited volumes.

The Channel wiki is maintained by Neal Patwari, Channel Area Editor for CRAWDAD, and collaboratively edited and updated by CRAWDAD users, who may directly edit the wiki. Please follow general wiki etiquite, and accept that the current text might not reflect the views of either the area editor or CRAWDAD. If you have any questions or suggestions, you may contact Neal at <npatwari -AT- ece -DOT- utah -DOT- edu>.