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Reciprocity calibration is one of the major practical challenges for massive multi-input multi-output (MIMO) systems operating in Time-Division Duplexing (TDD) mode. A new reciprocity calibration method is studied in this paper which can increase the system performance and also support online calibration. Firstly, a test device (TD) is used to send pilots to the base station (BS) to obtain the uplink...
In order to solve the liquefacient problem of the natural gas, this essay adopts high-pressure vortex tube with air as a medium, and studies the effect of the inlet to the performance of high-pressure vortex tube. The numerical simulation results demonstrate that with the increase of the ratio of the cooling air, the temperature of high-pressure vortex tube refrigeration effect will decrease at first,...
Considering the lack of effective evaluation on the sustainable development of inland water transport, an indicator system is designed for evaluation, illustration and checking of inland water transport sustainable development and an inland water transport decision support system for sustainable development is constructed based on data warehouse and online analytical processing (OLAP). The system...
Firstly, to construct project bidding decision-making of complex indexes, simplifying indexes system and preprocessing of sample data are performed through analytic hierarchy process to normal data. Secondly, a decision-making model is constructed using SOFM and trained by the sample data. The preliminary experimental result demonstrates that the AHP-SOFM model obtains better visual results and the...
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