Communications

Volume 3, Issue 1, January 2015

  • Simulation of Digital Optical Receiver of Intensity Modulation and Direct Detection

    Manuel Vítor Martingo Coelho

    Issue: Volume 3, Issue 1, January 2015
    Pages: 1-10
    Received: Feb. 21, 2015
    Accepted: Jun. 15, 2015
    Published: Jul. 02, 2015
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    Abstract: This article presents the implementation of an interactive software that integrates various functional blocks of an optical receiver of intensity modulation and direct detection (IM-DD), with OOK (on-off keying) digital modulation and NRZ (non-return-to-zero) pulse format. The software allows for the isolated simulation of each block, as well as th... Show More
  • Investigating Space Overhead by IPSec on IPv4 and IPv6 Communication Protocols

    Muhammed Nura Yusuf, Ali Mohammed Baba

    Issue: Volume 3, Issue 1, January 2015
    Pages: 11-23
    Received: Jul. 04, 2015
    Accepted: Jul. 13, 2015
    Published: Jul. 25, 2015
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    Abstract: IPsec, an internet layer three-security protocol suite is often characterised with introducing an additional space and processing overhead when implemented on a network for secured communication using either IPv4 or IPv6. The use of IPsec on IPv4 is an alternative that offers solutions and addresses the security vulnerabilities in network layer of ... Show More