Cooperative Spectrum Sensing Application Using RTL-Dongle Technology.

David Álvarez Cañizares, Eduardo García Cotrina, Alejandro A. Vistorte Salgado, Jorge Torres Gómez

Resumen


Cognitive Radio (CR) systems have become a key paradigm for future wireless communications. Spectrum management efficiency is improved by CR strategies, which allows to Secondary Users (SUs) get opportunistic access to idle bands licensed to Primary Users (PUs). Opportunistic access is usually achieved through spectrum sensing (SS) techniques to identify spectrum holes. Detection performance of spectrum holes, given by probability of detection (Pd) and probability of false alarm (Pfa), is improved when cooperative scheme is implemented. Cooperative Spectrum Sensing (CSS) schemes require a Fusion Center (FC) to collect and merge SS results from SUs, then to have enhance performance. In this paper,
we propose a C/C++ application based on Client/Server architecture for Cooperative Spectrum Sensing (CSS). RTL-Dongle device with Software Defined Radio (SDR) capabilities is used to implement SUs
nodes. Local sensing is implemented on each node by using Energy Detector (ED) method provided itslower computational costs. Then, each individual SS results are transmitted to the FC according to centralized
model of data report. FC data fusion is implemented by applying AND and OR parallel fusion rules. Finally, detection report is stored into .txt file for further processing. Application performance
is evaluated by detecting a transmitted reference pilot tone using ICOM-IC7100 equipment. Obtained results confirm the improvement of Pd and Pfa values.

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Revista Telemática. ISSN 1729-3804

Departamento de Telemática. Facultad de Telecomunicaciones y Electrónica.
Universidad Tecnológica de La Habana "José Antonio Echeverría", CUJAE.