Quick N Dirty - Freeradius on Raspberry Pi (original) (raw)
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Proceedings of the 2015 Annual Symposium on Computing for Development - DEV '15, 2015
Despite successful pilots in developing countries, TVWS (Television White Spaces, unused portions of television broadcasting spectrum) has not gained the amount of attention that it deserves. One of the reasons is the lack of spectrum measurements that would convince the regulators about the abundance of idle spectrum. Spectrum measurements traditionally require expensive instruments and considerable operator's expertise. This has changed with the emergence of low cost spectrum analyzers and smartphones. In this paper we present RFTrack, a software suite that consists of an Android application and a TVWS analysis server. Together, they measure spectrum using a low-cost spectrum analyzer and geotag the data using the phone's internal GPS. The Android application is very easy to use and campaigns can be carried out by non-technical users. Once an Internet connection is available, the program sends data to the server that performs the required processes to present the results in an easy-to-understand way, also allowing for some user customization. The system has been used in eleven countries. We present the results from a measurement campaign in Costa Rica. We believe that this is a useful tool to demonstrate the existence of underutilized spectrum, especially in rural areas of developing countries.
Particularly Low-Cost Portable Radio Frequency Interference Monitoring System
International Journal of Electromagnetics (IJEL)
We tested particularly low-cost (< EUR 25) software-defined radio (SDR) solutions for radio frequency interference (RFI) monitoring purposes. Two options were tested and a more suitable solution (RTL2832U with Rafael Micro R820T tuner) was chosen for the actual measurements. Radio interference measurements in the frequency range of 50 to 850 MHz were conducted at two different Nordic-Baltic radio observatories: Metsähovi Radio Observatory (MRO), Kylmälä, Finland and Ventspils International Radio Astronomy Centre (VIRAC), Irbene, Latvia. We noticed that the simple SDR solutions are functioning if the main purpose is to monitor the general, long-term radio environmental changes. The computing capacity of these low-cost solutions is still rather limited; thus, the real-time, wide band monitoring is not possible. Our observations showed that VIRAC is an ideal location for the low frequency (< 1 GHz) radio astronomical observations (e.g. LOFAR operations).
FreeRTOS BASED ENVIRONMENTAL DATA ACQUISITION USING ARM CORTEX M4F CORE
In today's decade of Big Data and complex computing, the Data acquisition systems hold a prime position. In this project, we present a Data acquisition system, which runs on ARM Cortex M4F core microcontroller and this whole system is managed by a real time operating system names FreeRTOS. Tiva C Series Launchpad is used as the board. The system is currently designed to monitor only temperature. A temperature sensor will be used for monitoring temperature. The data received will be stored in SD card. The main objective of this project is to design a data acquisition system, which is portable, cheaper and deterministic. Currently available systems in market are expensive and bulky whereas this FreeRTOS based Data acquisition system is cheaper and portable as well.
REGAL–Software Radio Implementation
ABSTRACT The deployment of the GALILEO system in Europe and in general the interest arising toward the satellite based navigation applications based on GPS and GLONASS has caused a growing interest towards the deployment of effective receivers. In particular it is interesting to design reconfigurable receivers able to deal with the GPS signals and to be reconfigured at no cost for the GALILEO signals, when they will be present.
Proceedings of the first workshop on Hot topics in software defined networks, 2012
We present OpenRadio, a novel design for a programmable wireless dataplane that provides modular and declarative programming interfaces across the entire wireless stack. Our key conceptual contribution is a principled refactoring of wireless protocols into processing and decision planes. The processing plane includes directed graphs of algorithmic actions (eg. 54Mbps OFDM WiFi or special encoding for video). The decision plane contains the logic which dictates which directed graph is used for a particular packet (eg. picking between data and video graphs). The decoupling provides a declarative interface to program the platform while hiding all underlying complexity of execution. An operator only expresses decision plane rules and corresponding processing plane action graphs to assemble a protocol. The scoped interface allows us to build a dataplane that arguably provides the right tradeoff between performance and flexibility. Our current system is capable of realizing modern wireless protocols (WiFi, LTE) on off-the-shelf DSP chips while providing flexibility to modify the PHY and MAC layers to implement protocol optimizations.
THE GNU SOFTWARE RADIO TRANSCEIVER PLATFORM
GNU Radio is a code base of free software that performs signal processing using a personal computer and freely available Radio Frequency (RF) receiver front-end designs. The GNU Radio receiver is an ideal platform for learning and experimenting with Software Defined Radio (SDR) concepts. Recent efforts at NCSA have extended the GNU Radio receiver design into a 900 MHz narrowband software defined radio transceiver. Our SDR transceiver is a useful tool for development of front-end hardware, algorithms, protocols, performance estimation, and operational visualization. In this paper we describe the extended hardware and software architecture for the SDR transceiver and describe a number of applications we have developed for it. One such application is SDR operational visualization software that serves as an educational tool for introducing the concepts of radio communications to novice users. Another new application is a reconfigurable communication protocol stack that includes network transport protocol layer, security layer, end-user application interface layer and a radio management layer which utilizes the SDR transceiver as the underlying communication fabric. In addition, we describe our efforts to prototype various user authentication mechanisms, such as voice pattern recognition, for unlocking specific application capabilities for specific users.
Since 1974, RYMSA RF has specialized in the implementation of complex broadcast radio and TV antenna systems providing turnkey services for customers on all five continents. Our expertise in this field has been strongly developed over the years leading us to today's market leadership position, with capabilities to manage each project from conceptual design to on-site installation and commissioning.
Data Acquisition in Wireless Router Link Testbed using GNU Radio Companion
A IEEE802.11g WLAN wireless-router link testbed is under development at the Idaho National Laboratory-Wireless Research Center. The project objective is to generate repeatable, high-quality, controlled-noise wireless transmissions for software-defined radio (SDR) analysis and research. Signal acquisition for the data link will include both an USRP X310 (with GNU Radio Companion) in parallel with a Tektronix RSA 306a Spectrum Analyzer. The integration and validation of the the SDR is described. Preliminary results indicate the router test-bed comprised of readilyavailable Wi-Fi and RF hardware will provide low-noise, and repeatable signal captures.