Projects

3g_wifi

2007-08-21T16:14:35-04:00

Location Assisted Middle-ware for Mobile Broadband Access References * Sierra 3G EVDO Card Diagnostic Software * Software for Openwrt with 3G * High-speed cellular wireless modems (e.g. EVDO, HSPDA) in Ubuntu GNU/Linux 6.10 * Using Verizon Wireless EVDO, PC5740, and Linux

anand

2008-04-08T14:53:35-04:00

Contact: Department of Computer Science, Stony Brook University, Stony Brook, NY 11794 Email: anand AT cs DOT sunysb DOT edu I am a graduate student in the Computer Science department at Stony Brook University. I work with Prof. Samir Das in the WINGS Lab. My current research is in measurement-based modeling of interference in 802.11-based wireless networks and developing interference-aware algorithms. I attended Indian Institute of Technology, Kanpur as an undergrad and studied Computer Scien…

anandps

2008-10-30T08:54:29-04:00

Useful Links for Testbed: * Kernel Compilation - Ubuntu Way * Kernel Compilation - Fedora Way * Soekris * Router Board * Metrix Pebble Linux * Host AP driver * Mad Wifi Driver * Wireless Tools for Linux * Click Modular Router * openHAL * ath5k * Linux Wireless

anycast

2007-01-28T17:33:59-04:00

Exploiting Path Diversity in the Link Layer in Wireless Multihop Networks Introduction We develop an anycast mechanism at the link layer for wireless ad hoc networks. The goal is to exploit path diversity in the link layer by choosing the best next hop to forward packets when multiple next hop choices are available. Such choices can come from a multipath routing protocol, for example. This technique can reduce transmission retries and packet drop probabilities in the face of channel fading. We…

courses

2008-04-08T14:53:35-04:00

CSE 590 Wireless Networking

cse590

2008-04-08T14:53:35-04:00

cwdmac

2007-04-03T00:06:41-04:00

Overview In this project, we address deafness and directional hidden terminal problem that occur when MAC protocols are designed for directional antenna based wireless multi-hop networks. Deafness occurs when the transmitter fails to communicate to its intended receiver, because the receiver's antenna is oriented in a different direction. The directional hidden terminal problem occurs when the transmitter fails to hear a prior RTS/CTS exchange between another pair of nodes and cause collision b…

deflect

2007-06-21T16:32:09-04:00

Introduction Existing multi-hop wireless routing protocols are incapable of reacting fast to transient degradation of link quality rendering them unsuitable for supporting real-time applications. This limitation is imposed on the metric-based routing protocols in order to achieve route stability and low protocol overhead. We design Deflect, a lightweight and opportunistic mechanism that works underneath the routing layer. Deflect enables fast local adaptation of end-to-end routes in response t…

dsa

2008-08-29T16:42:12-04:00

Overview Existing capacity constrained cellular networks that operate in fixed spectrum bands can be enhanced with capacity-on-demand services using the coordinated Dynamic Spectrum Access (CDSA) model. In this model, a centralized spectrum broker coordinates access to spectrum in a given region and assigns short term spectrum leases to competing wireless service providers and/or end users. In contrast to existing multi-year cellular spectrum licenses that span large regions, a spectrum broker…

fairness

2007-01-28T18:14:16-04:00

Fairness in Multihop Mesh Networks Introduction We have developed a protocol to achieve max-min fair scheduling in wireless multihop networks. Our protocol calculates fair shares of all flows in the network in a distributed manner. Each node in the network learns the flow contention graph in the local network by exchanging local information with its neighbors. By learning the flow contention graph, nodes are able to calculate the fair shares of the flows that they serve. Nodes then enforce thi…

gnuradio

2008-09-04T18:10:25-04:00

Software Defined Radio Related: * Gnuradio website * USRP - Ettus Research * Gnuradio Mailing list * Build Guide - In my experience, I tried both Fedora and Ubuntu. Ubuntu installation seems to be painless and works very easily. Follow this. For generic instructions see here. * How to write a Signal Processing Block - very useful * USRP under 1.5x magnifying glass - here. This is a very useful document in understanding the internals of USRP and also has important Q/A from the gn…

imesh

2007-06-09T16:29:54-04:00

Introduction In this project we designed iMesh, a wireless mesh network architecture for community networking applications that can provide seamless networking services to the mobiles both for last mile access and peer-to-peer access. The iMesh architecture uses 802.11-based access points (AP) that also double as mesh backbone routers. The fundamental design goal that we pursue is client side transparency. The mobile stations are unaware of the mesh networking backbone and they view the networ…

interference

2007-11-15T20:27:40-04:00

Introduction This work is being done with collaboration between NEC Labs, Princeton, NJ and WINGS Lab at SUNY, Stony Brook, NY. The goal of the project is to create a practical, empirically derived, measurement-based model of the capacity of a link in 802.11-based wireless networks. We do link-quality measurements on a testbed to determine delivery ratio and received signal strengths of each link. These measured parameters are then modeled into metrics that quantify interference between node…

long_distance_wifi

2009-10-12T23:19:56-04:00

microblogging

2008-03-09T00:32:55-04:00

Microblogging Introduction Microblogging is a form of blogging that allows users to write brief text updates and publish them, either to be viewed by anyone or by a restricted group which can be chosen by the user. Startups There are many companies that have started in 2006-07 around the idea of microblogging. Most of these companies center around a single theme -- updating the user's friends of his current activity. MySpace and Facebook have a similar feature that they call status updates…

mobisteer

2009-02-04T15:55:29-04:00

Overview We are investigating the use of directional antennas and beam steering techniques to improve performance of 802.11 links in the context of communication between a moving vehicle and roadside APs. We have developed a framework called MobiSteer that provides practical approaches to perform beam steering. MobiSteer can operate in two modes – cached mode – where it uses prior radio survey data collected during “idle” drives, and online mode, where it uses probing. The goal is to select the…

multicast

2007-01-28T19:30:41-04:00

Reliable Multicast MAC Introduction Many applications in wireless ad-hoc networks require multicast communication. In order to provide efficient multicast, various multicast routing protocols have been designed in recent years to facilitate formation of routes between multicast senders and receivers. There has also been some work to develop a suitable MAC protocol to improve efficiency of multicast communication. In this work we have proposed a MAC protocol that can improve the efficiency of …

multimac

2007-01-19T13:14:06-04:00

Overview It is now well-known that multihop wireless networks are fraught with significant capacity problems. Due to the broadcast nature of wireless transmissions -- resulting in interference -- only one transmission can occur in a physical neighborhood. In recent years several diversity techniques have been used to get around this fundamental limitation. One such diversity technique now being widely studied is use of multiple frequency channels. Use of multiple frequency channels enables con…

multiradiomesh

2008-04-26T12:24:29-04:00

[Multi-Radio Wireless Mesh Network: Reference Architecture ] Channel Assignment Overview In this project, we consider static multi-hop wireless mesh networks, where each router node is equipped with multiple radio interfaces and multiple channels are available for communication. We address the problem of assigning channels to communication links in the network with the objective of minimizing overall network interference. Since the number of radios on any node can be less than the number of a…

mutli-channel-dataset

2009-02-12T14:34:04-04:00

Understanding Channel and Interface Heterogeneity in Multi-Radio Multi-Channel Wireless Networks The dataset consist of measurements from two different wireless mesh network testbeds (802.11g and 802.11a). The 802.11g testbed uses 10 Dell latitude D510 laptops each with one Atheros chipset based D-link DWL AG660 PCMCIA 802.11a/b/g card with an internal antenna. The transmit powers are fixed to 15 dBm and data rate to 11 Mbps. Measurements from this testbed were collected on 54 different links o…

pub_area

2007-09-28T01:05:56-04:00

The documents distributed by this server have been provided as a means to ensure timely dissemination of scholarly work on a non-commercial basis. Copyright and all rights therein are maintained by the authors or by other copyright holders, such as the publisher of the definitive version. It is understood that all persons copying this information will adhere to the terms and conditions in the appropriate copyright.

pub_type

2007-02-01T17:41:10-04:00

pub_year

2009-09-16T12:30:32-04:00

The documents distributed by this server have been provided as a means to ensure timely and conveinent dissemination of scholarly work on a non-commercial basis. Copyright and all rights therein are maintained by the authors or by other copyright holders, such as the publisher of the definitive version. It is understood that all persons copying this information will adhere to the terms and conditions in the appropriate copyright.

rajendran_ideas

2009-09-19T22:14:19-04:00

* Analyse how different models work. Analyse how we could find if one activity is not recognizable. * Use ESSID names from the WiFi APs to classify the current location to Residential/Business/Entertainment. Then apply this as a clue/observation to the graphical models.

research

2007-01-18T02:02:00-04:00

Projects Measurement-Driven Modeling of Wireless Link Capacity VoIP on Wireless Mesh Networks For Internal Use

rfid

2007-03-04T22:05:03-04:00

MAC protocol for RFID Networks Introduction In this work, we develop a CSMA-based MAC protocol to avoid reader-reader and reader-tag collisions in a dense RFID network. The network is implemented using mote-based RFID readers. To implement the MAC protocol, we develop an appropriate carrier sensing circuit using an RFID tag as an antenna and the mote as an apparatus to sample received signal strength. We have augmented a commercially available OEM RFID module with such carrier sensing capabili…

sectorized_antenna

2008-10-16T08:19:16-04:00

Simulation Based Directional MAC Protocols * L. Bao and L. Garcia-Luna-Aceves. Transmission scheduling in ad hoc networks with directional antennas. In ACM Mobicom, 2002. * R. Choudhury and N.H Vaidya. Impact of directional antennas on ad hoc routing. In Personal and Wireless Communication (PWC), September 2003.

snr_gps

2009-03-06T19:22:02-04:00

CSE370: Measuring Signal Strength and GPS information Operating directory is /root/cse370. cd /root/cse370 To start the gps device: 1) Connect the gps and run: ./garmin_gps_ctl reset 1 2) To start the gps server: gpsd -n -N -D4 /dev/ttyUSB0

spectrum_sensing

2008-06-10T12:51:31-04:00

Spectrum Sensing Related Papers: * C. Cordeiro, M. Ghosh, D. Cavalcanti and K. Challapali, “Spectrum Sensing for Dynamic Spectrum Access of TV Bands”, in CROWNCOM 2007 * D. Čabrić, A. Tkachenko, R. W. Brodersen, “Experimental study of Spectrum Sensing based on Energy Detection and Network Cooperation”, ACM TAPAS, Aug 5, 2006 * D. Čabrić, A. Tkachenko, R. W. Brodersen, Spectrum Sensing Measurements of Pilot, Energy and Collaborative Detection. IEEE Milcom 2006, Oct 23-25, 2006 * F. E.…

traffic_analysis

2007-11-15T16:58:53-04:00

Introduction Collect WiFi traffic via snooping in a busy environment. Analyze the data. Comment on performance. Are there performance issues? Any interesting observations? Multiple concurrent snoopers will make the work more interesting. Utilities * tcpdump - For capturing packets from an interface. * ethereal - GUI for looking at headers of captured packets. Useful tool for traffic analysis. tethereal is the command line version of ethereal. * kismet - Another tool for capturing pack…

voip

2007-06-09T16:31:23-04:00

VoIP on Wireless Mesh Networks Introduction We study the problem of supporting VoIP calls in a wireless mesh network. For a dynamic system where calls arrive and depart, we propose a complete solution for admission control route selection for VoIP calls in a wireless mesh network environment. Specifically, we target the following goals --- (i) maintain the QoS of the ongoing calls as new calls are accepted and (ii) increasing the carrying capacity of VoIP calls in the network. In order to main…

wings_lab

2009-04-23T02:36:46-04:00

Home People Publication Links Photos Wireless Mesh Networks * Accurate Interference Models for TDMA in Wireless Networks - Ritesh Maheshwari, Shweta Jain, Jing Cao * Measurement-Driven Modeling of Wireless Link Capacity - Anand Kashyap

wormhole

2007-02-01T01:31:42-04:00

Overview Wireless ad hoc and sensor networks have gained popularity in recent years for the ease of deployment due to their infrastructure-less nature. One obvious use of such networks is in hostile environments for communications, monitoring, sensing etc. But being a broadcast medium, wireless medium offers an innate advantage to any adversary who intends to spy in or disrupt the network. Wormhole attacks are one of most easy to deploy for such an adversary and can cause great damage to the n…