The week's pick
Reseach Article
Legacy User Detection in OFDM Based Cognitive Radio
| International Conference in Recent trends in Computational Methods, Communication and Controls |
| Foundation of Computer Science USA |
| ICON3C - Number 7 |
| April 2012 |
| Authors: P. Lingeswari, K. J. Prasanna Venkatesan, V. Vijayarangan |
| d276fb19-e466-4f34-9fc0-527e8e303e80 |
P. Lingeswari, K. J. Prasanna Venkatesan, V. Vijayarangan . Legacy User Detection in OFDM Based Cognitive Radio. International Conference in Recent trends in Computational Methods, Communication and Controls. ICON3C, 7 (April 2012), 23-27.
Abstract
Radio transmission involves the use of part of the electromagnetic spectrum. Use of spectrum is regulated by Federal Communications Commission (FCC). Cognitive Radio (CR) provides solution to spectrum scarcity problem. The biggest challenge related to spectrum sensing is in developing sensing technique which are able to detect Primary User (PU) signals while being sufficiently fast and low cost implementation. In order to detect the presence of primary user signal with high probability, spectrum sensing is a fundamental requirement to achieve the goal of Cognitive Radio. Energy detection is one of the techniques to detect the primary users in CR. In this paper, energy detection technique is used to sense the spectrum so as to improve the detection performance of CR. The performance of energy detection may degrade at very low signal-to-noise (SNR). To overcome this, square law combining (SLC) scheme is proposed to enhance the detection probability. In particularly, the Orthogonal Frequency Division Multiplexing (OFDM) based CR receiver detect the primary user signal, where CR receiver is equipped with energy detector and SLC. Here, energy detection in OFDM based spectrum sensing in CR for single user is examined and simulation results are obtained. Significant improvement is observed in CR for primary user detection with OFDM based energy detector.
References
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