Study of tv white spaces in the context of cognitive radio for the deployment of WiFi in rural zones of the colombian army

This article presents a study on Television White Spaces (TVWS) to solve the connectivity of the WiFi service for the Colombian National Army in rural areas. The study analyzes regulatory aspects and technical equipment to provide a free internet access solution. Video transmission was experimentally validated, using OFDM with USRP N210 radios. With this preliminary analysis, it was possible to understand how the PHY and MAC layers of the 802.22 Standard work to select the appropriate devices.

Análisis de calidad de servicio en la transmisión por AM digital mediante el uso de códecs en USRP.

El objetivo fue realizar el estudio y análisis de la calidad de servicio en la transmisión am digital mediante el uso de códecs en USRP. La Metodología de desarrollo muestra claramente cómo se realizó el prototipo para la transmisión y recepción, empezando con la selección de dispositivos, el diseño, la ejecución y el análisis de los resultados obtenidos. Se basa en el estudio de las condiciones particulares en la transmisión y recepción de señal en AM digital (DRM), la implementación del transmisor en GNU Radio, la configuración del receptor en HDSDR y Dream SDR. Además de las tarjetas Ettus USRP N210, Ettus USRP B200 y RTL-SDR REALTEK RTL2832U. El resultado de este estudio fue la calidad de los niveles de servicio evaluados en la velocidad de transmisión (Kbps) y la relación señal / ruido (SNR) para determinar la fidelidad en la recepción de señales digitales. En base a los resultados se define que las características de funcionamiento de cada modo de robustez para un determinado canal de transmisión varían los valores de la velocidad de transmisión y la relación señal a ruido, ofreciendo el modo B una mejor protección de la señal con respecto al ruido, mientras que el modo A ofrece mayor velocidad de transmisión. El sistema DRM emplea las mejores tecnologías de compresión de sonido ya que usa los algoritmos de audio y voz del MPEG-4 que brinda excelente calidad de sonido a bajas tasas de bit como la codificación AAC.

Software Defined Radio: USRP N210 with GNU Radio

Driven by the increasing interest from the research community, this paper presents the current role of software defined radio (SDR) in academic and commercial applications which is helpful for the researchers, professors as well as students working in the area of signal processing and wireless communication. The authors mainly focus on universal software radio peripheral (USRP) N210 which is employed as hardware and GNU Radio as software to implement SDR for various applications that help the researchers to test and analyze various proposed techniques for different systems. Furthermore, this paper presents the implementation of basic analog/digital modulation techniques, and recent research works carried out by using SDR. This paper also presents several limitations and current usage of SDR in commercial and academic applications.

Development of Custom Interface Driver between USRP and SoC devices for SDR Applications

Global Navigation Satellite System (GNSS) is used to provide position based on satellite constellation. The GNSS Software defined radio (SDR) is a software approach which is more flexible than Hardware receivers. In GNSS SDR, most of the RF frontends are interfaced with a host-Personal Computer (PC). The host-PC based GNSS-SDR systems suffer from computational complexity and latency between IQ samples of GNSS signals. There are several RF front ends available to capture the real time signals. Among all these, USRP RF frontends are flexible for the prototype development. Earlier the host-PC was interfaced with the USRP device for the SDR implementation. In this work the, USRP N210 is interfaced with Zynq SoC device for GNSS SDR applications. This approach will introduce parallelism, which in turn leads to reduction in latency between IQ samples. A custom Ethernet driver to interface the USRP N210 with Zynq SoC device is proposed. The experimental results showcase that the proposed SoC based approach is suitable for GNSS-SDR prototype

Passive ionospheric radar builds with USRP N210

This paper presents first results and test of passive detection of Digisonde signal obtained at the Průhonice station, Czech Republic. Described technique can be used to analyze signals transmitted by the Digisonde and further received by simple loop antenna. The receiving system is based on the software defined radio (SDR USRP N210). The device works as the two channels receiver. This method will be employed to record oblique ionograms at several locations in the Czech Republic forming a simple array for detection of fine structures within ionospheric plasma using common DPS 4D transmitter. Using relatively inexpensive passive detection helps to increase a number of reflection points which leads to a better spatial coverage of the ionosphere sounding. The device represents a complementary measurement for detection of signal transmitted by Digisondes in European sector.

Development of a GFDM waveform with radio defined with software

In this paper the performance of a Generalized Frequency Division Multiplexing waveform is evaluated when compared to an Orthogonal Frequency Division Multiplexing signal. For the development of the previous waveforms, the GNU radio software and the Software Defined Radio (SDR) equipment USRP N210 are used. Through a spectrum analyzer the power of both waveforms are measured and the Out-of-Band Radiation is analyzed. Then, the results obtained are compared and the advantages and disadvantages of the implementation of GFDM as a waveform within the fifth generation systems are exposed.

DESAIN DAN PERANCANGAN MULTI SITE OPEN BTS 5 DENGAN USRP N210 DAN B210

Besarnya harapan kehadiran jaringan telekomunikasi di daerah pedalaman perbatasan, maka pembangunan jaringan dan penyediaan layanan jasa telekomunikasi di wilayah terpencil dan daerah perbatasan melalui dana dari operator telekomunikasi merupakan sesuatu yang sangat dinanti dan didukung oleh banyak pihak. membangun jaringan telekomunikasi baru bukan hal yang mudah. Akan ada banyak sekali tantangan yang siap menghadang di depan, misalnya penolakan dari masyarakat yang bersifat statis dan tertutup, keterbatasan dana, sulitnya mendapatkan akses energi untuk menghidupkan BTS, dan lain-lain. Dengan menggunakan OpenBTS kita dapat membangun jaringan telekomunikasi dengan biaya yang sangat ekonomis. Biaya investasi umumnya untuk membangun sebuah jaringan gsm bernilai milyaran rupiah bisa dihemat dengan menggunakan OpenBTS. Sehingga dampaknya bisa menguntungkan untuk operator celluer yang ingin mengembangkan jaringan , dengan OpenBTS perangkat yang digunakan menggunakan teknologi SDR (Software Define Radio), dimana teknologi SDR sendiri dapat memprogram frekuensi dengan menggunakan software tanpa perangkat tambahan. Pada penelitian kali ini, akan dijelakan kan bagaimana merancang multisite openbts dengan beberapa service seperti voice, dan sms. Teknologi tersebut dapat di buat dengan menggunakan computer dan perangkat usrp dengan system multisite.