Yazar "Darshi, Sam" seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • Küçük Resim Yok
    Öğe
    Cost and Efficiency Analysis of Steganography in the IEEE 802.11ah IoT Protocol
    (Tech Science Press, 2022) Almohammedi, Akram A.; Shepelev, Vladimir; Darshi, Sam; Balfaqih, Mohammed; Ghawbar, Fayad
    The widespread use of the Internet of Things (IoT) applications has enormously increased the danger level of data leakage and theft in IoT as data transmission occurs through a public channel. As a result, the security of the IoT has become a serious challenge in the field of information security. Steganography on the network is a critical tool for preventing the leakage of private information and enabling secure and encrypted communication. The primary purpose of steganography is to conceal sensitive information in any form of media such as audio, video, text, or photos, and securely transfer it through wireless networks. In this paper, we analyse the performance characteristics of one of the steganography techniques called Hidden Communication System for Corrupted Networks (HCCNETs) for hiding sensitive data. This performance analysis includes the efficiency and the cost of the system in Wireless Local Area Networks (WLANs), specifically in the IEEE 802.11ah IoT protocol. The analysis is mainly based on a two-dimensional Markov chain model in the presence of an error channel. Additionally, the model considers packet arrival rate, back-off timer freezing, back-off stages, and short retry limit to ensure compliance with IEEE 802.11ah requirements. It stresses the importance of taking these elements into consideration while modeling the efficiency and cost of the steganographic channel system. These parameters often result in a high precise channel access estimation, a more accurate and efficient accuracy measurements system, efficient channel utilisation, avoidance of throughput saturation overestimation, and ensuring that no packet is served endlessly. Evaluated results demonstrate that HCCNETs is an effective approach at low cost.
  • Küçük Resim Yok
    Öğe
    Drone Assisted Network Coded Cooperation With Energy Harvesting: Strengthening the Lifespan of the Wireless Networks
    (Ieee-Inst Electrical Electronics Engineers Inc, 2022) Kumar, Pankaj; Bhattacharyya, Sagnik; Darshi, Sam; Sharma, Ashwani; Almohammedi, Akram A.; Shepelev, Vladimir; Shailendra, Samar
    Next generation wireless systems include battery operated devices which demand higher throughput and a better reliability in an energy efficient fashion. To fulfil these requirements, in this paper, we propose a novel scenario where we include a dynamic Wireless Power Splitting (WPS) factor for Energy Harvesting (EH) at nodes in a Drone Assisted Network Coded Cooperation (DA-NCC) system. The dynamic WPS factor used for EH in DA-NCC system is made more realistic by determining through the probability of Line-of-Sight (LoS) occurrence. Analytical framework is developed for residual Analog Network Coding (ANC) noise and variance of ANC-noise in EH scenario. We also derive the average rate and average outage probability expressions for the proposed channel model. Various algorithms are developed for deciding the Air-to-Ground (A2G) channel distributions, harvesting the energy at relay and source nodes and evaluating the performance metrics of our proposed work. Our investigations reveal that the use of EH in DA-NCC improves the lifespan of the network. Our findings play important roles in disaster management scenarios where cellular connections to base stations are disrupted due to natural calamities and battery constrained drones are deployed for assistance.
  • Küçük Resim Yok
    Öğe
    Hybrid Relaying Based Cross Layer MAC Protocol Using Variable Beacon for Cooperative Vehicles
    (Ieee-Inst Electrical Electronics Engineers Inc, 2024) Bhattacharyya, Sagnik; Kumar, Pankaj; Darshi, Sam; Majhi, Sudhan; Kumbhani, Brijesh; Almohammedi, Akram A.
    The onset of network coded cooperation (NCC) and its applications in vehicle-to-everything (V2X) scenarios have allowed vehicular networks to relish both reliability and throughput which are the key factors in an on-road scenario. However, a typical NCC based network uses a time division multiple access (TDMA) based data transmission aided by a relay employing a fixed relaying scheme. This puts a concern on the system's quality-of-service (QoS). We thus propose a dual threshold-based hybrid (DTH) relaying scheme where the relay vehicle dynamically decides the relaying scheme or asks for a re-transmission to improve the QoS. The decision to select a relaying scheme is based on the instantaneous signal-to-noise ratio (SNR). Consequently, an acknowledgement frame structure is proposed to convey the crucial information to the destinations which are required during data extraction. A variable beacon interval is also proposed where the relay vehicle dynamically changes the beacon transmission time based on the number of re-transmissions which helps new users to join the system. Metrics like outage probability, achievable rate and throughput have been considered as the QoS metrics to compare the performance of the proposed model with respect to other existing works. Extensive simulations in MATLAB show that the proposed scheme experiences a better outage performance than amplify-and-forward (AF) whereas a worse performance when compared with decode-and-forward (DF). However, the better performance in the case of DF comes with a trade-off in terms of throughput when compared to the proposed scheme.
  • Küçük Resim Yok
    Öğe
    Outage Analysis Using Probabilistic Channel Model for Drone Assisted Multi-User Coded Cooperation System
    (Ieee-Inst Electrical Electronics Engineers Inc, 2023) Kumar, Pankaj; Bhattacharyya, Sagnik; Darshi, Sam; Majhi, Sudhan; Almohammedi, Akram A.; Shailendra, Samar
    This paper proposes a statistical-based channel modelling approach for a drone assisted multi-user coded cooperation (DA-MUCC) for evaluating the performance metrics of a next-generation wireless communication system. The proposed approach may find its applications in smart cities, disaster management and agriculture for building reliable communication links among ground users (GUs)/user equipments (UEs) over the scenarios where an infrastructure-based network (like a Base Station (BS)) is difficult to establish or disrupted. In such scenarios, an air-to-ground (A2G) channel is modelled based on the probabilistic approach of line-of-sight (LoS) and statistical independence of the links. The network performance of the proposed system model is evaluated by closed-form average outage probability and average rate over the Rayleigh and Rician fading channel models. The analytical performance is corroborated by Monte-Carlo simulations and also compared with the existing state-of-the-art approaches. Finally, we derive the probability density function (PDF) for signal-to-noise ratio (SNR) of relay link which is useful under the scenarios where the direct links among GUs are in the deep fade.