PAPR reduction using OQAM for spectrum sensing

• Published in: International journal of pervasive computing and communications Vol. 17; no. 3; pp. 301 - 314
• Main Authors: Renuka, N, Satya, Sairam M
• Format: Journal Article
• Language: English
• Published: Bingley Emerald Group Publishing Limited 21.07.2021
• Subjects: Cognitive radio; Efficiency; Energy transmission; Expected values; Filtration; Interference; Leakage; Metric system; Orthogonal Frequency Division Multiplexing; Power spectral density; Pulse shape; Quadrature amplitude modulation; Spectra; Spectrum allocation; Wireless communications
• ISSN: 1742-7371; 1742-738X
• DOI: 10.1108/IJPCC-08-2020-0106

PurposeThe tremendous growth of wireless applications and the demand for high data rate, the spectrum utilization improvement has been the most crucial challenges for wireless communication. Adapting cognitive radio with orthogonal frequency division multiplexing or offset quadrature amplitude modulation (OFDM/OQAM) improves the spectrum and energy efficiencies.Design/methodology/approachThus, it overcomes the spectral leakage problem at the transmitter side and leads to less interference from secondary user (SUs) to primary user (PUs) and between the SUs in cognitive radio technology. The benefit of exploiting pulse shape filtering in the OFDM/OQAM is to not only eliminate the requirement of the guard bands but also reduce the out of band energy transmission, which also improves the spectral isolation from the neighboring systems. But the high peak to average power ratio (PAPR) phenomenon is a common issue in the majority of the multicarrier modulation systems and thus OFDM/OQAM is no exception in this case.FindingsTherefore, this paper aims to examine the effect of integrating the Walsh–Hadamard Transform (WHT) on the power spectral density and investigates the problem of PAPR in the WHT/OQAM system.Originality/valueThus, it overcomes the spectral leakage problem at the transmitter side and leads to less interference from SUs to PUs and between the SUs in cognitive radio technology. The benefit of exploiting pulse shape filtering in the OFDM/OQAM is to not only eliminate the requirement of the guard bands but also reduce the out of band energy transmission, which also improves the spectral isolation from the neighboring systems. But the high PAPR phenomenon is a common issue in the majority of the multicarrier modulation systems thus OFDM/OQAM is no exception in this case.