工频

Multipath signals. To reduce the effect of the destructive interference, grid group scrambling techniques

缘容 发生这样的破坏性干涉，而这样的破坏性干涉主要自於正交分频多工系统中的项为旋

Suppressing the interference is an important issue in OFDMA multi-cellular systems because the interference spreading function is only suitable for code division multiple access systems but not for OFDMA systems.

能有效抑制干扰的影响是蜂巢式网路系统的重要问题，因为干扰扩展函数只能适用在分码多工系统而无法适用於正交分频多工系统。

Simulations show that the proposed methods can greatly enhance the performance of OFDM systems in the presence of ISI.

模拟的结果显示，当符元间干扰出现时，我们的所提出的演算法，能有效地加强正交分频多工系统的效能。

Under partial load conditions the draft tube 3D simulation results showed that the climax of pressure fluctuation of draft tube vortex incepted at the underside of cone part closed by bend and the frequency of the pressure fluctuation accorded with times frequency rule very well.

部分负荷工况下尾水管内三维非定常计算结果表明，尾水管涡带压力脉动最大发生在直锥段下面靠近弯肘段，并且脉动频率符合实际的倍频规律，从而验证了简化公式的正确性。

Chapter 5 improves the antenna switch, phase-locked loop and frequency modulator circuits of the existing VHF FM transceiver so that the improved VHF FM transceiver can combine with the hardware composed of a high speed DSP chip TMS32010 and a single -chip microcomputer 8031 to become the TD-SFD digital radio set.

第五章对现有超短波单工电台的天线转换开关、锁相环、调频等电路进行了改造以使得改造后的电台配接TMS32010、8031组成的硬件系统成为数字时分同频双工电台。

The proposed architecture utilizes the carrier suppression technique to achieve frequency doubling and successfully transmits a high spectral efficiency OFDM signal.

我们提出的架构使用载波抑制技术来达到二倍频效果且成功的传输高频谱效益的正交分频多工讯号。

Similar to other kind of communication systems, the radio frequency modular of RSU in DSRC include many parts such ad antenna, duplexer, low noise amplifier, local oscillator, mixer, filter, modulator, demodulator, and so on. It's difficult to analyze every part in the system fully, so the emphasis is mainly on the parts designed and implemented for the RSU by myself.

和其它通信系统类似，专用短程通信系统路边单元的射频部分包含天线、双工滤波器、低噪声放大器、混频器、本振、滤波器、调制解调器等多个功能模块，论文中要完整地介绍和分析每一个功能模块是困难的，因此本文主要介绍自己亲自完成的部分。

GaAs RF switch MMICs for cellular phone; GaAs RF power amplifier MMICs for cellular phone; GaAs RF switch MMICs for base station; GaAs RF attenuator MMICs for base station; RF module for base station; GaAs power amplifier MMICs for CATV; MOSFET power devices;SAW resonators; SAW filters; SAW duplexers; N type and P type 4＂-6＂silicon epitaxial wafers.

这次参展的产品有：用于移动蜂窝电话的砷化镓射频单片集成电路；用于移动通信基站的射频IC及电路模块；用于CATV的砷化镓IC；MOSFET等功率器件；声表面波谐振器；声表面波滤波器；声表面波双工器；4＂-6＂N型和P型各类硅外延片。

Diplexers, a sort of three-port filter, can separate different band of frequency, and are the key component in the RF communication system.

双工器是一种三端口滤波器，起到分频和隔离的作用，是射频通信中常用的关键性器件。

Our company's productline was developed from microwave ferrite devices to all of the RF passive components, Product suite includes diplexers, filters, Combiner, Splitter, coupling devices, isolator, circulator and POI frequency devices.

公司的产品也从单纯的微波铁氧体器件发展到几乎涵盖所有的射频无源器件。产品包括双工器，滤波器，合路器，功分器，藕合器，隔离器，环行器及POI等射频无源器件和组件

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。