Browsing by Author "`Aini Syuhada Md Zain"
  • Publication
    Enhanced coordinated multipoint transmission based on parameter selection and scheduling technique for LTE-advanced network optimization
    ( 2019)
    `Aini Syuhada Md Zain
    The increase demand on Internet and data transmission leads to the evolution of high speed, high data rate of wireless mobile communication architecture which is categorized as fourth generation and beyond fourth generation technologies. The new architectures called Long Term Evolution and Long Term Evolution Advanced support for packet-switch traffic, offer great quality of service and user experience, as well as provide services on top of internet protocol. For efficient utilization of LTE characteristics, resource allocation is a significant parameter to ensure the users satisfy with the services granted by the network. Various resource allocation strategies can be adopted to increase the performance of the network. Scheduling is one of the process to allocate physical resources to the user equipment using an efficient scheduling algorithms. This research work investigates the performance of selected parameters to setup network for various application. This research work provides an optimization framework for downlink resource allocation in a single cell with multi-user system then extended for multi-cell system. The developed algorithm, which is known as Iterative Optimization Algorithm (IOpA) used orthogonal array-based optimization technique to enhance the parameter selections for network performance. The framework applied to the OMNeT-based simulator as the simulation tool. The performance criteria measured are based on throughput, delay and quality of experience for voice of IP (VoIP) traffic application. Various known scheduling algorithms are evaluated in the framework which are Maximum of Carrier to Interference (MaxCI) scheme, Discrete Round Robin (DRR) scheme and Proportional Fair (PF) scheme. The optimal design setting suggests the best combination on “Number of User”, scheduling scheme, bandwidth and user’s position required to set up the network. The consistency of performance are obtained by making scheduling schemes unaffected for the influence of the uncontrollable factors such as user mobility speed and data packet size. The highest value of throughput and mean opinion score index are obtained from MaxCI scheme and also provides the lowest value of frame delay and packet delay variation in the evaluated network scenario. Further evaluation on scheduling schemes is extended to multi-cells environment. A new mechanism on coordinated scheduling has been introduced for the multi-cells system. Coordinated scheduling algorithm has improved about 30.8% for average mean opinion score index of VoIP parameter, 88.9% for VoIP packet delay variation, 89.7% for VoIP frame delay and 26.8% for VoIP received throughput. Adopting the coordinated multipoint transmission, the coordinated scheduling algorithm is performing well as compared to MaxCI scheme, which is more reasonable in single-cell system.
  • Publication
    SWIPT in Rician MIMO Interference Channels with Spatial Antenna Correlation
    ( 2020-12-11)
    Wan Nur Suryani Firuz Wan Ariffin
    ;
    Mohammad Reza Nakhai
    ;
    Hasneeza Liza Zakaria
    ;
    Nur Baya Mohd Hashim
    ;
    `Aini Syuhada Md Zain
    ;
    Hasliza A Rahim @ Samsuddin
    In this paper, we investigate simultaneous wireless information and power transfer (SWIPT) under spatial correlation in multiuser multiple-input-multiple-output (MU-MIMO) fading channels where the line-of-sight (LOS) path between the transmitter and the receiver is present. While the energy receiving terminals are harvesting energy, the information receiving terminals are receiving their desired signal-to-interference-plus-noise ratio (SINR) under the total power constraint at the transmitting terminal of the proposed SWIPT system. We use the Kronecker model to study the impact of MIMO antenna correlation and the Rician K-factor as the main parameter to set up the different fading conditions. We use semi-definite programming (SDP) to formulate the proposed SWIPT system. Our numerical results confirm that the performance of the proposed design improves in the absence of LOS component, i.e., with a zero K-factor or pure Rayleigh fading channel, and deteriorates as the LOS channel component grows. We show that the total harvested energy monotonically decreases as the Rician K-factor increases.