Multiband Spectrum Sensing Using Modified Daniell Windowing Technique in Full-Duplex Cognitive Radio Networks: A Perform
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Multiband Spectrum Sensing Using Modified Daniell Windowing Technique in Full‑Duplex Cognitive Radio Networks: A Performance Study Tripta1 · Seemanti Saha1 Accepted: 29 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Full-duplex cognitive radio (CR) is a promising technology for upcoming 5G wireless communication systems. This paper presents a robust fast Fourier transform (FFT) based multiband spectrum sensing using two-dimensional averaging algorithms in orthogonal frequency division multiplexing systems in full-duplex CR networks with residual self interference under Rayleigh flat fading scenario. In the proposed algorithm, we have used modified Daniell windowing technique both in time and frequency dimensions to smoothen the FFT spectrum under full-duplex scenario. The analytical expressions for the performance metrics are derived for the aforementioned algorithm. The simulated and analytical results, obtained for the proposed algorithm using modified Daniell windowing technique are found in good agreement. Finally, the comparison studies between the proposed scheme using modified Daniel windowing technique and the conventional rectangular windowing scheme clearly depict that the proposed scheme gives optimal performance even at low SNR using fewer filter lengths in time and frequency dimensions as the modified Daniell windowing algorithm is less influenced due to spectral leakage. Keywords Full-duplex · Cognitive radio · Multibansd spectrum sensing · Signal detection · Rayleigh flat-fading
1 Introduction The proliferation of advance technologies for existing as well as upcoming wireless applications have increased the demand for the efficient utilization of the drastically depleting limited spectrum resources [1, 2]. Cognitive radio (CR) is emerging as a potential approach for the upcoming generation of wireless communication systems to use effectively the vacant spectral resources dynamically [3, 4]. In CR networks (CRNs), the secondary user * Tripta [email protected] Seemanti Saha [email protected] 1
Electronics and Communication Engineering Department, National Institute of Technology Patna, Patna, India
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(SU)/unlicensed user can opportunistically access the unused licensed band of the primary user (PU), ensuring a minimum acceptable quality of service (QoS) to itself and maximum QoS to PU user. To accomplish this, the SU senses the absence or presence of PU signal and accordingly decides its state as busy or idle. This operation is referred as spectrum sensing (SS) which is found as the most crucial operation of CR technology for its practical implementation issues [5]. In various CRNs, reported in the literature, the SU operates in half-duplex mode where two separate channels are used for sensing and transmission [5] whereas, the full-duplex mode operation of SU utilizing the same channel for both sensing and transmission is capable of almost doubling the spectrum efficiency in comparison to half-duplex mode
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