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( Pooria Varahram ),( Borhanuddin Mohd Ali ),( Somayeh Mohammady ),( Ahmed Wasif Reza ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.6
Peak to average power ratio (PAPR) is one of the main imperfections in the broadband communication systems with multiple carriers. In this paper, a new crest factor reduction (CFR) scheme based on interleaved phase sequence called Dummy Sequence Insertion Enhanced Partial Transmit Sequence (DSI-EPTS) is proposed which effectively reduces the PAPR while at the same time keeps the total complexity low. Moreover, the prototype of the proposed scheme in field programmable gate array (FPGA) is demonstrated. In DSI-EPTS scheme, a new matrix of phase sequence is defined which leads to a significant reduction in hardware complexity due to its less searching operation to extract the optimum phase sequence. The obtained results show comparable performance with slight difference due to the FPGA constraints. The results show 5 dB reduction in PAPR by applying the DSI-EPTS scheme with low complexity and low power consumption.
( Yaseein Soubhi Hussein ),( Borhanuddin M Ali ),( Mohd Fadlee A. Rasid ),( Aduwati Sali ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.7
High data rates in long-term evolution (LTE) networks can affect the mobility of networks and their performance. The speed and motion of user equipment (UE) can compromise seamless connectivity. However, a proper handover (HO) decision can maintain quality of service (QoS) and increase system throughput. While this may lead to an increase in complexity and operational costs, self-optimization can enhance network performance by improving resource utilization and user experience and by reducing operational and capital expenditure. In this study, we propose the self-optimization of HO parameters based on fuzzy logic control (FLC) and multiple preparation (MP), which we name FuzAMP. Fuzzy logic control can be used to control self-optimized HO parameters, such as the HO margin and time-to-trigger (TTT) based on multiple criteria, viz HO ping pong (HOPP), HO failure (HOF) and UE speeds. A MP approach is adopted to overcome the hard HO (HHO) drawbacks, such as the large delay and unreliable procedures caused by the break-before-make process. The results of this study show that the proposed method significantly reduces HOF, HOPP, and packet loss ratio (PLR) at various UE speeds compared to the HHO and the enhanced weighted performance HO parameter optimization (EWPHPO) algorithms.
Yaseein Soubhi Hussein,Borhanuddin Mohd Ali,Mohd Fadlee A. Rasid,Aduwati Sali 한국전자통신연구원 2014 ETRI Journal Vol.36 No.4
The burgeoning growth of real-time applications, suchas interactive video and VoIP, places a heavy demand for ahigh data rate and guarantee of QoS from a network. Thisis being addressed by fourth generation networks such asLong-Term Evolution (LTE). But, the mobility of userequipment that needs to be handed over to a new evolvednode base-station (eNB) while maintaining connectivitywith high data rates poses a significant challenge thatneeds to be addressed. Handover (HO) normally takesplace at cell borders, which normally suffers highinterference. This inter-cell interference (ICI) can affectHO procedures, as well as reduce throughput. In thispaper, soft frequency reuse (SFR) and multiplepreparations (MP), so-called SFRAMP, are proposed toprovide a seamless and fast handover with highthroughput by keeping the ICI low. Simulation resultsusing LTE-Sim show that the outage probability and delayare reduced by 24.4% and 11.9%, respectively, over thehard handover method — quite a significant result.
( Ahmed M. Shamsan Saleh ),( Borhanuddin Mohd. Ali ),( Hafizal Mohamad ),( Mohd Fadlee A. Rasid ),( Alyani Ismail ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.7
Over recent years, enormous amounts of research in wireless sensor networks (WSNs) have been conducted, due to its multifarious applications such as in environmental monitoring, object tracking, disaster management, manufacturing, monitoring and control. In some of WSN applications dependent the energy-efficient and link reliability are demanded. Hence, this paper presents a routing protocol that considers these two criteria. We propose a new mechanism called Reliable Routing Scheme for Energy-Balanced (RRSEB) to reduce the packets dropped during the data communications. It is based on Swarm Intelligence (SI) using the Ant Colony Optimization (ACO) method. The RRSEB is a self-adaptive method to ensure the high routing reliability in WSNs, if the failures occur due to the movement of the sensor nodes or sensor node`s energy depletion. This is done by introducing a new method to create alternative paths together with the data routing obtained during the path discovery stage. The goal of this operation is to update and offer new routing information in order to construct the multiple paths resulting in an increased reliability of the sensor network. From the simulation, we have seen that the proposed method shows better results in terms of packet delivery ratio and energy efficiency.