Browsing 10 Technology by Author "Nguyen Tuan"

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Browsing 10 Technology by Author "Nguyen Tuan"

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  • Effects of Users Mobility on the Selection of Time Slot Size in TDMA Wireless Networks 
    Trang Chung; Nguyen Dinh; Nguyen Tuan (Vietnam National University Publisher, 2008)
    Users mobility in wireless networks has the obvious effect of increasing the channel fading fluctuation rate, hence the efficiency of opportunistic scheduling algorithms. In time-slotted wireless systems, the chosen slot ...
  • An FSMC Model for the ACM Scheme with Repetition Coding in Mobile WiMAX 
    Nguyen Dinh; Vu Thang; Nguyen Tuan (IEEE, 2009)
    To protect vital control information from deep fades, repetition coding is recommended in mobile WiMAX. This paper considers repetition coding as a maximum ratio combining process and proposes an expression for the coding ...
  • Optimal Design Of Triplet Halfband Filter Banks Via Semidefinite Programming 
    Kha H; Hoang Tuan; Nguyen Tuan (IEEE, 2007)
    This paper proposes a computationally efficient method for designing a class of triplet halfband filter banks. We show that the design of perfect reconstruction two-channel filter banks with arbitrary regularity order can ...
  • Robust Watermarking With Improved Modified Spread Spectrum 
    Nguyen Tuan; Hoang Tuan; Nguyen Tuan (IEEE, 2007)
    This paper presents a robust approach for spread spectrum (SS) based watermarking process. Unlike the traditional SS or other improvements, this method can work properly in case of absence of watermark and achieve good ...
  • Scale-Domain Equalizer for Wavelet-Based ADSL 
    Nguyen Tuan; Nguyen Dinh (IEEE, 2006)
    Current opinions vary on the question of suitability of wavelet-based multi-carrier modulation (MCM) systems for communication through dispersive time invariant channels such as digital subscriber line (DSL) and wireless ...
  • Stability of bandwidth request control based on dual feedback in BWA networks 
    Nguyen Tuan; Nguyen Dinh (IEEE, 2009)
    In order for the base station to respond quickly and efficiently to the uplink bandwidth request in broadband wireless access (BWA) networks using time-division duplex (TDD), a dual feedback control algorithm has recently ...