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( 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.
A Hybrid PAPR Reduction Scheme for Optical Wireless OFDM Communication Systems
( Ayad A. Abdulkafi ),( Mohamad Yusoff Alias ),( Yaseein Soubhi Hussein ),( Nazaruddin Omar ),( Mohd Kamarulzamin Bin Salleh ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.3
This paper proposes a new hybrid scheme to decrease the high peak to average power ratio (PAPR) of optical orthogonal frequency division multiplexing (OFDM) signals in visible light communication (VLC) systems. The PAPR causes nonlinear signal distortions and high power requirements for the VLC transmitter (light emitting diode, LED). The proposed method is applicable for both direct current-biased optical OFDM (DCO-OFDM) and asymmetrically clipped optical OFDM (ACO-OFDM). In the proposed scheme, the PTS method is firstly modified to fit both optical OFDM approaches transmission and then combined with signal clipping method for further PAPR reduction and bit error rate (BER) improvement of the VLC system. The performance of hybrid scheme has been evaluated and compared with the original OFDM based VLC system, conventional PTS and clipping methods. The results show that the hybrid scheme outperforms other methods in terms of both the PAPR reduction and BER performance.