Superimposed Training Combined Approach for a Reduced Phase of Spectrum Sensing in Cognitive Radio

Autor: Marco Cardenas-Juarez, Armando Arce, Lizeth Lopez-Lopez, Aldo G. Orozco-Lugo, Ulises Pineda-Rico, Enrique Stevens-Navarro
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Sensors, Vol 19, Iss 11, p 2425 (2019)
Sensors
Volume 19
Issue 11
Sensors (Basel, Switzerland)
ISSN: 1424-8220
Popis: This paper presents an approach to exploit the superimposed training (ST)-based primary users&rsquo
(PUs) transmissions in the context of spectrum sensing for cognitive radio. In the low signal-to-noise ratio (SNR), the proposed scheme splits the spectrum sensing phase into two sample processing periods, allowing a secondary user (SU) to carry out a training sequence synchronization (with a small probability of error) before the implementation of a robust spectrum sensing algorithm that enhances the detection, based on the deterministic signal components embedded in the ST PU&rsquo
s signals along with the unknown data signal. The overall sensing performance is improved using a reasonable number of samples to achieve a high probability of detection, resulting in a reduced spectrum sensing duration. Furthermore, a low computational complexity version of the proposed ST combined approach for a reduced phase (SCAR-Phase) of spectrum sensing is presented, which attains the same detection performance with a smaller number of real operations in the low SNR. In the practical consideration of imperfect training sequence synchronizations, the results show the advantages of exploiting the ST sequence to perform spectrum sensing, thus quantifying the significant improvement in detection performance and the maximum SU&rsquo
s achievable throughput.
Databáze: OpenAIRE
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