Improved sensing detector for wireless regional area networks

Cogent Engineering

Geetam Singh Tomar¹  Jyotshana Kanti² 

[1] Machine Intelligence Research Labs;Uttarakhand Technical University;

关键词: cognitive radio networks;    single adaptive threshold;    two adaptive thresholds;    two detectors;    cooperative spectrum sensing;    spectrum sensing;   

DOI  :  10.1080/23311916.2017.1286729

来源: DOAJ

【 摘 要 】

In wireless communication, noise and fading affect the radio signals. Multiple antennas one of the solutions to nullify these affects. In this paper, authors proposed an improved sensing detector for wireless regional area networks. The presented scheme uses two detectors concept, detectors imply multiple antennas, follows selection combination to select best signals. The proposed model not only improves the detection performance but also decreases the sensing time. Out of the two detectors the first one is energy detector with single adaptive threshold and second one is energy detector with two adaptive thresholds. The thresholds are adaptive as they are dependent on noise variance ($ \sigma_{\omega }^{2} $), and the value of this noise variance changes according to the noise signal. Both the detectors work simultaneously and their output is then fed to a decision devise which takes the decision using OR rule. In the proposed scheme more than one antenna has been used and is compared with existing sensing techniques. Results show that the proposed an improved sensing detector technique while number of antennas (Nr) = 2, improves the detection performance by 24.6, 53.4, 37.9, and 49.6%, as compared to existing schemes (i.e. EDT-ASS-2015 scheme, ED and cyclo-2010, adaptive SS-2012, and conventional-ED) scheme at −12 dB SNR respectively. Meanwhile, proposed technique also decreases sensing time in the order of 47.0, 49.0, and 53.2 ms as compared to existing schemes (EDT-ASS-2015, Adaptive SS-2012, and ED and Cyclo-2010) scheme at −20 dB SNR respectively. Further, in cooperative SS the local decisions from each cognitive radio are transferred to a fusion center which makes the final decision and shares the decision to every cognitive radio. It is also found that the proposed detection technique with CSS when number of CR users (k) = 10, and Nr = 2, achieves spectrum detection performance in the order of 0.9 for SNR value of as low as −20 dB.

【 授权许可】

Unknown