During the last few years, much research has been focused on algorithms to improve spectrum sensing. One of these research topics is related to energy detection of signals with low SNR. Most of the research focused on energy detections algorithms is done in simulation tools such as Matlab.

The objective of this work is to build an energy detection block that could be used as a tool in GNU Radio or in GNU Radio Companion. The main characteristic is that the energy detection block gets optimal accuracy when it tries to detect signals with low SNR. It has parameters that could change sensing sensitivity and bandwidth.

Real testing shows that the energy detector block gets excellent accuracy sensing signals with SNR equal to 4 dB with a bandwidth of 5 MHz.

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