Yazar "Alabbas, Amjed Razzaq" seçeneğine göre listele

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    A survey on state of the inter body radio communication channel: performance and solutions
    (John Wiley and Sons Inc., 2022) Mezher, Mohanad; Alabbas, Amjed Razzaq; Ilyas, Muhammad
    The development of in-vivo communications and networking systems has the potential for improving the healthcare delivery while also enabling the creation of new services and applications. In-vivo communications provide wireless networked cyber-physical systems of the embedded devices that enable accurate, quick, and cost-effective responses under a variety of circumstances. Also, it is focused upon modeling and characterizing in-vivo wireless channel, as well as contrasting it to other well-known channels. In this paper, channel coding is also mentioned because it improves data rates and performance gain. This work also discusses present problems and potential research topics for in-vivo communications. This article aims to show the researchers how the orthogonal frequency multiple access (OFDMA) technique improved the performance of in-vivo channel and how it is outperformed compared to the other techniques (TDM, TDMA, CDMA and OFDM) also how the OFDMA outperformed equalizers and channel coding in terms of bit error rate with giving a significant improvement of data transmitting and avoiding inter symbol interference. However, when it comes to the in-vivo communications, the modeling of in-vivo wireless channel is vital. Understanding the features of the in-vivo channel is critical for achieving optimal processing and designing successful procedures that allow WBANs to be arranged inside the human body.
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    Öğe
    Performance enhancement of safety message communication via designing dynamic power control mechanisms in vehicular ad hoc networks
    (Wiley, 2021) Alabbas, Amjed Razzaq; Hassnawi, Layth A.; Ilyas, Muhammad; Pervaiz, Haris; Abbasi, Qammer H.; Bayat, Oğuz
    In vehicular ad hoc networks (VANETs), transmission power is a key factor in several performance measures, such as throughput, delay, and energy efficiency. Vehicle mobility in VANETs creates a highly dynamic topology that leads to a nontrivial task of maintaining connectivity due to rapid topology changes. Therefore, using fixed transmission power adversely affects VANET connectivity and leads to network performance degradation. New cross-layer power control algorithms called (BL-TPC 802.11MAC and DTPC 802.11 MAC) are designed, modeled, and evaluated in this paper. The designed algorithms can be deployed in smart cities, highway, and urban city roads. The designed algorithms improve VANET performance by adapting transmission power dynamically to improve network connectivity. The power adaptation is based on inspecting some network parameters, such as node density, network load, and media access control (MAC) queue state, and then deciding on the required power level. Obtained results indicate that the designed power control algorithm outperforms the traditional 802.11p MAC considering the number of received safety messages, network connectivity, network throughput, and the number of dropped safety messages. Consequently, improving network performance means enhancing the safety of vehicle drivers in smart cities, highway, and urban city.