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Muhammad Hanif,양홍추안,Gary Boudreau,Edward Sich,Hossein Seyedmehdi 한국통신학회 2018 Journal of communications and networks Vol.20 No.2
Massive MIMO technology is a promising candidate forthe next generation wireless communication systems. The basicidea is to implement a large number of antennas at the base station(BS) of a cell to serve a relatively small number of users. Such an approach brings many benefits in terms of the throughputand energy efficiency. Two major challenges associated withmassive MIMO systems are high power consumption and high systemcomplexity. These problems can effectively be dealt with byperforming antenna-subset selection at the BS. In this paper, wepropose low-complexity antenna-subset selection schemes for bothsingle-cell and multiple-cell cooperative massive MIMO systemsfor equal-rate zero-forcing beamforming transmission at the BS. These schemes sequentially select an antenna that contributes themost to the overall system sum rate. Simulation results show thatour proposed schemes outperform other schemes with similar computationalcomplexities and even surpass some of the higher computationalcomplexity schemes in a massive MIMO setting.
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Study effect of different parameters on the sulphate sorption onto nano alumina
Reza Katal,Mehdi Jafari,Amir Hossein Saeedi Dehaghani,Seyedmehdi Sharifian,Mohammed Ali Ghayyem,Mohsen Vafaie Sefti 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
The aim of this research work is to investigate sorption characteristic of modified nano alumina (n-Al) for the removal of SO42 from aqueous solutions and wastewater. The sorption of SO42 by batch method is carried out. The optimum conditions of sorption were found to be: a sorbent dose of 0.3 g in 100 ml of SO42, contact time of 35 min, pH = 5. In optimum condition, removal efficiency was 85.6% for the SO42. Three equations, i.e. Morris–Weber, Lagergren and pseudo second order have been tested to track the kinetics of removal process. The Langmuir, Freundlich and D–R are subjected to sorption data to estimate sorption capacity. It can be concluded that n-Al has potential to remove SO42 ions from aqueous solutions at different concentrations. It was found that the temperature has positive effect on the process and negative DG values indicated thermodynamically feasible and spontaneous nature of the sorption. Positive value of DS reveals the increased randomness at the solid–solution interface during the fixation of the ion on the active sites of the sorbent. The effect of other anions was studied and it was found the existence of them in the solution has considerable effect on the sulphate removal.
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