Browsing by Author "Imam-Fulani, Yusuf"
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Item Hybridization of OFDM and Physical Layer Techniques for Information Security in Wireless System.(by Sule Lamido University Journal of Science & Technology, 2023-03-31) Lukman .A, Olawoyin; Abdul -Rahman, Musrafah; Nasir, Faruk; Abdulkarim, Oloyede; Temitayo, Adeniran; Imam-Fulani, Yusuf; Olabamji, Lasisi; Sikiru, Ismaeel; Bashir, Abdullahi BabaDue to quest for high data rate, reliable and secure communication, this has motivated both wired and wireless network access service providers to deploy a next-generation network with ability to meet the required need. The use orthogonal frequency division multiplexing (OFDM) enables reliable transmission of various data traffic by optimizing subcarrier, power, and allocation of bits among different users. Traditionally, securing data in wireless system is always at the upper layer of open system interconnection (OSI) Model by using data encryption techniques. However, such techniques may not be acceptable for future decentralized networks due to their high complexity in implementation and computation. In this work, an OFDM IEEE 802.11a wireless system is used and physical layer encryption (PLE) schemes are implemented in securing the information transfer between two legitimate parties. In the simulation, the source data are encrypted by obfuscation with dummy data in between the encrypted data of which 52 subcarriers were considered of which 25 subcarriers are reserved for dummy data and 27 were for data. The simulation was conducted for four different modulation techniques i.e., BPSK, QPSK, 16 QAM, and 64 QAM. The result obtained shown that for all the modulation schemes, the key rate increases with an increase in the reserved subcarrier bits. Also, the security level increased when substantial percentages of the subcarriers are reserved for dummy data.Item Spatial variability analysis of duty cycle in GSM band(IEEE, 2018-02-08) Faruk, Nasir; Imam-Fulani, Yusuf; Sikiru, Ismael, A.; popoola, Segun, I.; Oloyede, Abdulkarim, A; Olawoyin, Lukmon, A.; Surajudeen-Bakinde, N. , T.The introduction of new kinds of technological products, applications and services that rely on wireless communications has resulted into an upsurge in global mobile data traffic. There is, therefore, a need to investigate the efficient utilization of the limited available radio spectrum. In this paper, we examine the spatial variation of spectrum occupancy (i.e. duty cycle) in the GSM 900 MHz band within Kwara State, Nigeria. Experimental results show that there is a very high spatial variance in duty cycle from one location to the other with mean occupancies of 1.67% and 17.76% in rural and urban locations respectively. It is worthy to mention that some rural locations recorded 0% duty cycle. Therefore, the telecommunication industry in Nigeria should adopt useful techniques to maximize the scarce radio resources, especially for rural areas.