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In this paper, a frequency domain averaging (FDA) method is presented to improve channel estimation in offset quadrature amplitude modulation based orthogonal frequency-division multiplexing (OQAM-OFDM) systems. Considering that existing preamble structures are not optimal for the FDA method, a preamble optimization scheme based on the FDA method is also presented to further improve the channel estimation...
This paper considers a production planning problem in disassembly systems, which is the problem of determining the quantity and timing of disassembling used or end-of-life products in order to satisfy the demand of their parts or components over a finite planning horizon. We study the case of single product type without parts commonality, that is, assembly product structure. The objective is to minimize...
An improved heuristic recursive strategy combining with genetic algorithm is presented in this paper. Firstly, this method searches some rectangles, which have the same length or width, to form some layers without waste space, then it uses the heuristic recursive strategies to calculate the height of the remaining packing order and uses the evolutionary capability of genetic algorithm to reduce the...
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