In this paper,a new pill-box window with arc groove disk is studied for S-band high power klystron.Its main characteristics are long pill-box and periodic grooved window disk.The long pill-box window can decrease the ...In this paper,a new pill-box window with arc groove disk is studied for S-band high power klystron.Its main characteristics are long pill-box and periodic grooved window disk.The long pill-box window can decrease the normal field and relieve the radio frequency loss in high power transmission,and periodic grooved window disk can suppress tangential field multipactor.The Monte Carlo(MC)method is used to build up the simulation model and analyze the increasing tendency of electrons.The simulation results indicate that long-box window with periodic arc grooved window disk can restrain multipactor effectively.Homocentric circular half-camber arc slot is put forward to overcome the disadvantages of periodic straight triangle and strait rectangular.The long pill-box with groove disk window prototype is tested in high power Travelling Wave Resonant Ring(TWRR)and the experimental results show an excellent character of this window.展开更多
In this paper, an Independent Window-Access(IWA) scheme is proposed, and the performance of an input-buffered ATM switching fabric with the IWA scheme is analysed by means of a probability generating function approach...In this paper, an Independent Window-Access(IWA) scheme is proposed, and the performance of an input-buffered ATM switching fabric with the IWA scheme is analysed by means of a probability generating function approach, the closed formulas of the average cell delay and the maximum throughput are given, and results show that the IWA scheme makes the switching fabric have better performances than traditional window-access scheme. The computer simulation results are in good agreement with these analytical results.展开更多
Windows Mobile Standard是主流的手机操作系统之一,但其中的汉字输入法少,用户选择余地小。首先比较了Windows Mobile Standard中文输入法与桌面Windows中文输入法的异同,分析了Windows Mobile Standard的输入接口,然后讲解了设计并实...Windows Mobile Standard是主流的手机操作系统之一,但其中的汉字输入法少,用户选择余地小。首先比较了Windows Mobile Standard中文输入法与桌面Windows中文输入法的异同,分析了Windows Mobile Standard的输入接口,然后讲解了设计并实现一个Windows Mobile Standard纵横码中文输入法的过程,描述了其中的一些关键问题。纵横码汉字输入法的开发对于各种输入法向手持设备上移植具有借鉴意义。展开更多
Channel estimation is very important for MIMO (Multiple Input Multiple Output) OFDM (Or-thogonal Frequency Division Multiplexing) systems, but its precision is reduced due to the noise in channel. In this letter, circ...Channel estimation is very important for MIMO (Multiple Input Multiple Output) OFDM (Or-thogonal Frequency Division Multiplexing) systems, but its precision is reduced due to the noise in channel. In this letter, circularly slipping window is introduced to resist the noise. It can be proved by simulation that with the same channel model, optimal slipping window length is the same with different vehicle speed. MSE (Minimum Square Error) of channel is greatly reduced with circularly slipping window, and performance of the system is closed to that with correct channel estimation.展开更多
基金Supported by the Youth Scientific and Technological Innovation Funding
文摘In this paper,a new pill-box window with arc groove disk is studied for S-band high power klystron.Its main characteristics are long pill-box and periodic grooved window disk.The long pill-box window can decrease the normal field and relieve the radio frequency loss in high power transmission,and periodic grooved window disk can suppress tangential field multipactor.The Monte Carlo(MC)method is used to build up the simulation model and analyze the increasing tendency of electrons.The simulation results indicate that long-box window with periodic arc grooved window disk can restrain multipactor effectively.Homocentric circular half-camber arc slot is put forward to overcome the disadvantages of periodic straight triangle and strait rectangular.The long pill-box with groove disk window prototype is tested in high power Travelling Wave Resonant Ring(TWRR)and the experimental results show an excellent character of this window.
文摘In this paper, an Independent Window-Access(IWA) scheme is proposed, and the performance of an input-buffered ATM switching fabric with the IWA scheme is analysed by means of a probability generating function approach, the closed formulas of the average cell delay and the maximum throughput are given, and results show that the IWA scheme makes the switching fabric have better performances than traditional window-access scheme. The computer simulation results are in good agreement with these analytical results.
文摘Windows Mobile Standard是主流的手机操作系统之一,但其中的汉字输入法少,用户选择余地小。首先比较了Windows Mobile Standard中文输入法与桌面Windows中文输入法的异同,分析了Windows Mobile Standard的输入接口,然后讲解了设计并实现一个Windows Mobile Standard纵横码中文输入法的过程,描述了其中的一些关键问题。纵横码汉字输入法的开发对于各种输入法向手持设备上移植具有借鉴意义。
文摘Channel estimation is very important for MIMO (Multiple Input Multiple Output) OFDM (Or-thogonal Frequency Division Multiplexing) systems, but its precision is reduced due to the noise in channel. In this letter, circularly slipping window is introduced to resist the noise. It can be proved by simulation that with the same channel model, optimal slipping window length is the same with different vehicle speed. MSE (Minimum Square Error) of channel is greatly reduced with circularly slipping window, and performance of the system is closed to that with correct channel estimation.
