Papers by Kamarul Ariffin Noordin
Microwave and Optical Technology Letters
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2018 International Conference on Smart Computing and Electronic Enterprise (ICSCEE), Jul 1, 2018
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Physical Communication
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Wireless Networks
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Computers & Electrical Engineering
Cooperative relay (CR) is a favorable technique to provide better spectral efficiency and enhance... more Cooperative relay (CR) is a favorable technique to provide better spectral efficiency and enhance the cell coverage area in a cost-effective manner. However, several undesired issues, such as high-power consumption, arise due to use of a high number of relay nodes (RNs) in the network, Moreover, in a dynamic environment, full channel state information (CSI) is not always available. Therefore, all RNs need to calculate the abrupt changes in the channel; otherwise, the overhead delay will increase and the RNs will consume higher network power. To address this, an optimized modified genetic algorithm (Modified GA) based scheme is proposed that utilizes probabilistic selection rules and fitness scores. The results are presented in terms of symbol error rate (SER), network capacity, power consumption, and power improvement in order to analyze the performance of the proposed scheme. The results show that the proposed scheme provides better overall performance as compared to conventional optimization approaches.
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Optics Communications, 2015
ABSTRACT A new approach to mitigate the phase noise in all-optical OFDM systems is analytically m... more ABSTRACT A new approach to mitigate the phase noise in all-optical OFDM systems is analytically modeled and numerically demonstrated. The interaction time between subcarriers is minimized by shaping the envelopes of QAM subcarriers and making a delay time between even and odd subcarriers. Return-to-zero (RZ) coding is adopted for shaping the envelopes of subcarriers. In addition, the subcarriers are alternately delayed (AD) by optical time delayers. The performance of an all-optical OFDM system, that implements the proposed technique, is analyzed and simulated. This system has 29 subcarriers with symbol rate of 25 Gsymbol/s and is composed of coupler-based inverse fast Fourier transform (IFFT)/fast Fourier transform (FFT) schemes. Each subcarrier is modulated with QAM format before shaping with RZ coding. Due to RZ being more affected by dispersion; a full periodic dispersion map is adopted to keep the total accumulated dispersion low. The results reveal that the nonlinear phase noise (NPN) due to fiber nonlinearity is significantly mitigated when the time delay between the odd and even subcarriers is equal to half the symbol period. The total phase noise variance is reduced from 9.3×10-3 to 6.1×10-3 rad2 when employing AD RZ-QAM for a transmission distance of 550 km. Furthermore, both the transmission distance and optical signal to noise ratio (OSNR) are improved when compared to all-optical OFDM systems that adopt traditional QAM modulation formats.
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Extensive numbers of the IEEE 802.16e Mobile WiMAX scheduling proposals focus on simulation for o... more Extensive numbers of the IEEE 802.16e Mobile WiMAX scheduling proposals focus on simulation for obtaining performance measures of the proposed scheduling algorithm. There is also handful of article that focused on the mathematical modeling. However, the model is derived assuming the traffic from different quality of service (QoS) classes is separated, which allow for independent analysis. In this paper, we propose an uplink (UL) scheduling algorithm that considers the adaptive modulation and coding scheme and QoS parameters of all five service classes. The resources are distributed in two stages. The first stage allocates the resources to different classes of service in accordance to the threshold based priority while the second stage allocates the resources within the same class with the exhaustive service strategy. A mathematical model that combine the different QoS classes of Mobile WiMAX is formulated and it is derived based on the weighted sum of the mean waiting time for the i...
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Applied Mechanics and Materials, Nov 26, 2014
This paper investigates the performance of three well-known algorithms namely Proportional Fairne... more This paper investigates the performance of three well-known algorithms namely Proportional Fairness, Exponential Proportional Fairness and Modified-Largest Weighted Delay First in LTE network. This study is based on their performance in three smart grid applications (Sub-Station Automation, Advance Metering Infrastructure and Wide Area Situational Awareness). In addition, a new mathematical model has been developed and proposed to target certain weakness of the above mentioned algorithms.
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International Journal of Distributed Sensor Networks, Dec 19, 2014
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Plos One, Apr 1, 2015
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Http Dx Doi Org 10 1080 00207217 2011 629229, 2012
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International Journal of Distributed Sensor Networks, 2016
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In this paper, the problem of distributed power control is investigated and analyzed for two-tier... more In this paper, the problem of distributed power control is investigated and analyzed for two-tiered femtocell networks that share the same frequency band with the central macrocell. Femtocell users are associated with a proper utility function via pricing, which represents the ratio of user's signal-to-interference-noise ratio (SINR) and the exponential price of power consumed. Assuming a femtocell user seeks selfishly to maximize its utility function under the imposed constraints, a femtocell non-cooperative power control game (FNPC) is formulated. We prove the existence and uniqueness of the Nash Equilibrium output for the game model of power control algorithm. Numerical results show the effectiveness of pricing parameters in the penalty function to the speed of convergence and power consumed.
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In the recent years, femtocell technology has received a considerable attention due to the
abilit... more In the recent years, femtocell technology has received a considerable attention due to the
ability to provide an efficient indoor wireless coverage as well as enhanced capacity. However,
under the spectrum sharing between femtocell user equipment (FUEs) and the owner of
spectrum macrocell user equipment (MUEs), both may experience higher uplink interference
to each other. This paper proposes a novel distributed power control algorithm for the
interference management in two-tier femtocell networks. Due to the assignment of licensed
radio frequency to the outdoor macrocell users, the access priority of MUEs should be higher
than FUEs. In addition, the quality of service (QoS) of MUEs that is expressed in the target
signal-to-interference-plus-noise ratio (SINR) must always be achieved. On the other hand, we
consider an efficient QoS provisioning cost function for the low-tier FUEs. The proposed
algorithm requires only local information and converges even in cases where the frontiers of
available power serve the target SINRs impossible. The advantage of the algorithm is the
ability to implement in a distributed manner. Simulation results show that the proposed
algorithm based on our cost function provides effective resource allocation and substantial
power saving as compared to the traditional algorithms.
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Papers by Kamarul Ariffin Noordin
ability to provide an efficient indoor wireless coverage as well as enhanced capacity. However,
under the spectrum sharing between femtocell user equipment (FUEs) and the owner of
spectrum macrocell user equipment (MUEs), both may experience higher uplink interference
to each other. This paper proposes a novel distributed power control algorithm for the
interference management in two-tier femtocell networks. Due to the assignment of licensed
radio frequency to the outdoor macrocell users, the access priority of MUEs should be higher
than FUEs. In addition, the quality of service (QoS) of MUEs that is expressed in the target
signal-to-interference-plus-noise ratio (SINR) must always be achieved. On the other hand, we
consider an efficient QoS provisioning cost function for the low-tier FUEs. The proposed
algorithm requires only local information and converges even in cases where the frontiers of
available power serve the target SINRs impossible. The advantage of the algorithm is the
ability to implement in a distributed manner. Simulation results show that the proposed
algorithm based on our cost function provides effective resource allocation and substantial
power saving as compared to the traditional algorithms.
ability to provide an efficient indoor wireless coverage as well as enhanced capacity. However,
under the spectrum sharing between femtocell user equipment (FUEs) and the owner of
spectrum macrocell user equipment (MUEs), both may experience higher uplink interference
to each other. This paper proposes a novel distributed power control algorithm for the
interference management in two-tier femtocell networks. Due to the assignment of licensed
radio frequency to the outdoor macrocell users, the access priority of MUEs should be higher
than FUEs. In addition, the quality of service (QoS) of MUEs that is expressed in the target
signal-to-interference-plus-noise ratio (SINR) must always be achieved. On the other hand, we
consider an efficient QoS provisioning cost function for the low-tier FUEs. The proposed
algorithm requires only local information and converges even in cases where the frontiers of
available power serve the target SINRs impossible. The advantage of the algorithm is the
ability to implement in a distributed manner. Simulation results show that the proposed
algorithm based on our cost function provides effective resource allocation and substantial
power saving as compared to the traditional algorithms.