The shrinking of cell-size brings significant changes to the wireless uplink of densely small cells （DSCs）. A codebook design is proposed that utilizes the strong line of sight （LOS） chan- nel component existing i...The shrinking of cell-size brings significant changes to the wireless uplink of densely small cells （DSCs）. A codebook design is proposed that utilizes the strong line of sight （LOS） chan- nel component existing in a DSC system for uplink of the DSC system. To further improve the uplink performance, the high-rank codebook is designed based on singular value decomposition （SVD） due to the unnecessary preservation of strict constant modulus in the DSC system. And according to the simulation result, the proposed codebook leads to significant sum-rate gain and appreciable block error rate （BLER） performance improvement in the DSC system.展开更多
针对非线性船舶航向控制系统,将Line of Sight(LOS)引导律与滑模控制算法相结合,设计一种航向保持滑模控制算法,通过设计合理的李雅普诺夫函数及利用其稳定性理论对系统的稳定性进行了分析,并利用"育龙"轮运动数学模型进行计...针对非线性船舶航向控制系统,将Line of Sight(LOS)引导律与滑模控制算法相结合,设计一种航向保持滑模控制算法,通过设计合理的李雅普诺夫函数及利用其稳定性理论对系统的稳定性进行了分析,并利用"育龙"轮运动数学模型进行计算机模拟仿真,验证设计思想的可行性和控制算法的合理性及有效性。仿真结果表明,控制算法可以保证航向控制系统的渐近收敛及稳定,根据该控制算法所设计的控制器,能够使船舶航向精确的保持在预定航向上,具有优良的控制效果。展开更多
基金supported by the National High-tech Research and Development Program of China(863 Program)(2012AA111902)the Shanghai Natural Science Foundation(12ZR1433900)
文摘The shrinking of cell-size brings significant changes to the wireless uplink of densely small cells （DSCs）. A codebook design is proposed that utilizes the strong line of sight （LOS） chan- nel component existing in a DSC system for uplink of the DSC system. To further improve the uplink performance, the high-rank codebook is designed based on singular value decomposition （SVD） due to the unnecessary preservation of strict constant modulus in the DSC system. And according to the simulation result, the proposed codebook leads to significant sum-rate gain and appreciable block error rate （BLER） performance improvement in the DSC system.
文摘针对非线性船舶航向控制系统,将Line of Sight(LOS)引导律与滑模控制算法相结合,设计一种航向保持滑模控制算法,通过设计合理的李雅普诺夫函数及利用其稳定性理论对系统的稳定性进行了分析,并利用"育龙"轮运动数学模型进行计算机模拟仿真,验证设计思想的可行性和控制算法的合理性及有效性。仿真结果表明,控制算法可以保证航向控制系统的渐近收敛及稳定,根据该控制算法所设计的控制器,能够使船舶航向精确的保持在预定航向上,具有优良的控制效果。
