The integrated hydraulic transformer has a compact structure and no throttling loss in the process of pressure regulation.It is widely used in the common pressure rail hydrostatic transmission system.The integrated hy...The integrated hydraulic transformer has a compact structure and no throttling loss in the process of pressure regulation.It is widely used in the common pressure rail hydrostatic transmission system.The integrated hydraulic transformer is realized by designing more than three ports on the distribution plate,and the voltage transformation characteristics of the integrated hydraulic transformer with different port numbers are different.In this paper,the influence of port number on the pressure ratio of integrated hydraulic transformer was studied,and the pressure ratio characteristics of 3⁃ports,4⁃ports,and 5⁃ports integrated hydraulic transformer were obtained,and an experimental platform was built for experimental verification,which shows that the simulation results are consistent with the experimental results and provides a theoretical basis for the design of integrated hydraulic transformer.展开更多
在长期演进（LTE）系统中,发送天线端口数通过循环冗余校验掩码的方式隐含于物理广播信道（PBCH）中,终端在解读PBCH信道获取主信息块（MIB）的同时,需要正确检测PBCH采用的发送天线端口数。传统的检测方法尝试分别用1、2、4等3种发射...在长期演进（LTE）系统中,发送天线端口数通过循环冗余校验掩码的方式隐含于物理广播信道（PBCH）中,终端在解读PBCH信道获取主信息块（MIB）的同时,需要正确检测PBCH采用的发送天线端口数。传统的检测方法尝试分别用1、2、4等3种发射天线数进行PBCH译码,直至正确译码为止,译码复杂度非常高。基于此,提出一种改进的天线端口数估计算法,提取各天线端口传输的小区参考信号序列做相关,通过相关值与相关系数门限值的比较直接快速获取基站的实际天线端口数。仿真结果表明：该算法相较于传统检测算法和功率检测算法在时间复杂度上分别提升了4个数量级和3倍;在信噪比高于0 d B时,所提检测算法较功率检测算法有4-6 d B的增益。展开更多
在长期演进(long term evolution,LTE)系统中,传统天线端口数检测使用盲检测的方式分别对1,2和4端口数进行解码,直至物理广播信道系统消息成功通过循环冗余码校验,该方法会产生大量的计算冗余和时延。针对这一问题,提出一种改进的卡尔...在长期演进(long term evolution,LTE)系统中,传统天线端口数检测使用盲检测的方式分别对1,2和4端口数进行解码,直至物理广播信道系统消息成功通过循环冗余码校验,该方法会产生大量的计算冗余和时延。针对这一问题,提出一种改进的卡尔曼自回归天线端口数检测算法,该算法通过提取不同天线端口对应的小区参考信号得到信道状态信息,并将信道状态的相位信息进行卡尔曼自回归拟合,将自回归拟合后的相位与接收信号相位作差得到的平均值与预设判决门限进行比较,以得到天线端口数判决结果。理论分析与仿真结果表明,改进算法相较于传统盲检测算法节省的时间开销可达49%。在相同信噪比下,相较于其他优化后的门限判决算法,改进算法最多提高约10%的检测成功率且具有更优的抗频偏性能。展开更多
This study analyzes the effect of ship size on the liner service configuration by establishing an economic model. The service configuration is characterized by the distance of service and the number of calling ports. ...This study analyzes the effect of ship size on the liner service configuration by establishing an economic model. The service configuration is characterized by the distance of service and the number of calling ports. A study ease is presented for illustration. At last such a conclusion is drawn that given a fixed profit, the ship size will change with the extension of service in the same direction, while the change rate of ship size is a little higher than that of the extension of service.展开更多
基金the National Key Research and Development Plan Projects(Grant No.2018YFB2001200)the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant Nos.19KJB460026,19KJA140002)the Six Talent Peak Training Projects in Jiangsu Province(Grant No.JXQC-36).
文摘The integrated hydraulic transformer has a compact structure and no throttling loss in the process of pressure regulation.It is widely used in the common pressure rail hydrostatic transmission system.The integrated hydraulic transformer is realized by designing more than three ports on the distribution plate,and the voltage transformation characteristics of the integrated hydraulic transformer with different port numbers are different.In this paper,the influence of port number on the pressure ratio of integrated hydraulic transformer was studied,and the pressure ratio characteristics of 3⁃ports,4⁃ports,and 5⁃ports integrated hydraulic transformer were obtained,and an experimental platform was built for experimental verification,which shows that the simulation results are consistent with the experimental results and provides a theoretical basis for the design of integrated hydraulic transformer.
文摘在长期演进（LTE）系统中,发送天线端口数通过循环冗余校验掩码的方式隐含于物理广播信道（PBCH）中,终端在解读PBCH信道获取主信息块（MIB）的同时,需要正确检测PBCH采用的发送天线端口数。传统的检测方法尝试分别用1、2、4等3种发射天线数进行PBCH译码,直至正确译码为止,译码复杂度非常高。基于此,提出一种改进的天线端口数估计算法,提取各天线端口传输的小区参考信号序列做相关,通过相关值与相关系数门限值的比较直接快速获取基站的实际天线端口数。仿真结果表明：该算法相较于传统检测算法和功率检测算法在时间复杂度上分别提升了4个数量级和3倍;在信噪比高于0 d B时,所提检测算法较功率检测算法有4-6 d B的增益。
文摘在长期演进(long term evolution,LTE)系统中,传统天线端口数检测使用盲检测的方式分别对1,2和4端口数进行解码,直至物理广播信道系统消息成功通过循环冗余码校验,该方法会产生大量的计算冗余和时延。针对这一问题,提出一种改进的卡尔曼自回归天线端口数检测算法,该算法通过提取不同天线端口对应的小区参考信号得到信道状态信息,并将信道状态的相位信息进行卡尔曼自回归拟合,将自回归拟合后的相位与接收信号相位作差得到的平均值与预设判决门限进行比较,以得到天线端口数判决结果。理论分析与仿真结果表明,改进算法相较于传统盲检测算法节省的时间开销可达49%。在相同信噪比下,相较于其他优化后的门限判决算法,改进算法最多提高约10%的检测成功率且具有更优的抗频偏性能。
基金The National Natural Science Foundation of China (40635026)
文摘This study analyzes the effect of ship size on the liner service configuration by establishing an economic model. The service configuration is characterized by the distance of service and the number of calling ports. A study ease is presented for illustration. At last such a conclusion is drawn that given a fixed profit, the ship size will change with the extension of service in the same direction, while the change rate of ship size is a little higher than that of the extension of service.
