Browsing by Subject "Optimization methods"

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    The design of finite-state machines for quantization using simulated annealing
    (IEEE, 1993) Kuruoğlu, Ercan Engin; Ayanoğlu, E.
    In this paper, the combinatorial optimization algorithm known as simulated annealing is used for the optimization of the trellis structure or the next-state map of the decoder finite-state machine in trellis waveform coding. The generalized Lloyd algorithm which finds the optimum codebook is incorporated into simulated annealing. Comparison of simulation results with previous work in the literature shows that this combined method yields coding systems with good performance.
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    Numerical diffraction synthesis of 2-D quasioptical power splitter
    (IEEE, 2007-06) Nosich, A. A.; Gandel, Y. V.; Magath, T.; Altıntaş, Ayhan
    A new diffraction synthesis method is proposed for computing quasioptical 2-D reflector beam splitters in the E-polarization case. It is a combination of a numerical gradient (NG) optimization and an efficient analysis method based on singular integral equations (SIEs) which are discretized using a fast and accurate numerical Nystrom-type method of discrete singularities (MDS). The results of design are shown for a 40-quasioptical power splitter obtained from an offset parabolic reflector fed by in-focus beam source.