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• W2013233022 abstract "We propose a low-complexity user scheduling scheme to enhance the sum rate performance for a multicell downlink system, in which the base station (BS) is equipped with a large-scale active antenna array. First, we divide each cell into<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mrow><mml:mi>N</mml:mi></mml:mrow></mml:math>regions according to the vertical beamwidth of the BS antennas. Next, candidate user equipment (UE) items are assigned to corresponding groups to their locations. Each scheduling slot is also divided into<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mrow><mml:mi>N</mml:mi></mml:mrow></mml:math>equal-time subslots. Then, at each subslot, we focus on one UE group, select the optimal number,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>, of UEs for simultaneous data transmission in the manner of round-robin scheduling, and adjust the BS antenna tilting to the optimal angle<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M4><mml:mrow><mml:msubsup><mml:mrow><mml:mi>θ</mml:mi></mml:mrow><mml:mrow><mml:mtext>t</mml:mtext><mml:mtext>i</mml:mtext><mml:mtext>l</mml:mtext><mml:mtext>t</mml:mtext></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msubsup></mml:mrow></mml:math>. In particular,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M5><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M6><mml:mrow><mml:msubsup><mml:mrow><mml:mi>θ</mml:mi></mml:mrow><mml:mrow><mml:mtext>t</mml:mtext><mml:mtext>i</mml:mtext><mml:mtext>l</mml:mtext><mml:mtext>t</mml:mtext></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msubsup></mml:mrow></mml:math>for each UE group are both obtained by means of large-system asymptotic analysis. Benefiting from the random matrix theory tools, the asymptotic analytical results are independent of instantaneous channel state information of UE, which make it possible to solve<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M7><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M8><mml:mrow><mml:msubsup><mml:mrow><mml:mi>θ</mml:mi></mml:mrow><mml:mrow><mml:mtext>t</mml:mtext><mml:mtext>i</mml:mtext><mml:mtext>l</mml:mtext><mml:mtext>t</mml:mtext></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msubsup></mml:mrow></mml:math>offline, therefore saving the online computational resources significantly. Numerical results verify that the proposed scheme achieves good sum rate performance with extremely low computational complexity." @default.
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• W2013233022 date "2015-01-01" @default.
• W2013233022 modified "2023-10-15" @default.
• W2013233022 title "Low-Complexity User Scheduling with Switched Tilting for 3D Cellular Systems" @default.
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