查询词典 frequency channel

On the basement of passband subsampling and digital downconvertion, according to QPSK with 30M carrier frequency and 8M bandwidth, digital IF channel is elaborately analyzed .

以对中频为30MHz，带宽为±4MHz的输入QPSK信号进行带通欠采样和数字下变频为基础，提出和分析了中频数字化通道的实现方案，进行了相应的多相低通抽取滤波器的设计，并针对数字中频信号就数字下变频模块进行了仿真，从而验证了整个下变频系统参数设计的可行性。

On the basement of passband subsampling and digital downconvertion, according to QPSK with 30M carrier frequency and 8M bandwidth, digital IF channel is elaborately analyzed .In this module, multiple phase filters are elaborately designed .According to this module, IF digital signal is simulated .

以对中频为30MHz，带宽为±4MHz的输入QPSK信号进行带通欠采样和数字下变频为基础，提出和分析了中频数字化通道的实现方案，进行了相应的多相低通抽取滤波器的设计，并针对数字中频信号就数字下变频模块进行了仿真，从而验证了整个下变频系统参数设计的可行性。

The invention discloses a method for dynamic channel allocation in TDD-CDMA mobile communication system. Based on the distance between mobile station and subzone base station BS, mobile stations MS are classified. Code tract in same group of code track (carrier frequency + time slot) is allocated to the mobile station with nearer distance. MS with different distances have different requirements of emission power. Whether crossed time slot code track group can be used or not, and use of group of code track with what kind of multiplexing factor need to be determined.

本发明公开了一种TDD－CDMA移动通信系统的动态信道分配方法，是将移动台MS按照与本小区基站BS的距离进行分类，同一个码道组中的码道分配给距离相近的移动台MS；同时不同距离的MS对发射功率的要求不同，对相邻小区的干扰也不同，系统根据MS对发射功率的要求，确定其是否可以使用交叉时隙码道组和使用哪种复用因子的码道组。

Characteristics of the business has:(1) smart battery design, development, production (the main application fields Laptop batteries, camera batteries, batteries of various instruments and meters, etc.), real-time monitoring of battery capacity, the use of time, the use of frequency, this technology is at the international leading level;(2) a variety of instruments and equipment of the external power supply products, high-power, intelligent, thin and light, no memory effect, multi-channel voltage output;(3) Lithium battery protection circuit, a string, two string, three strings, four string protection circuits can be designed in accordance with the requirements of customers;(4) charger, the company has developed a string, second string, three strings, four strings of different power lithium battery charger and car charger browser; product line:* Ni-MH rechargeable battery Series ------------------------------------* nickel cadmium rechargeable battery Series * Rechargeable lithium-ion battery series ------------------------------------* all Class Series rechargeable battery pack * lithium manganese dioxide battery series ------------------------------------* lithium thionyl chloride battery series argon company spirit of "honesty, technology and innovation" concept, the "quality first, consumers first" concept, is willing to work with all sectors of cooperation, common development and prosperity.

特色业务有：（1）智能电池设计、开发、生产（主要应用领域笔记本电脑电池、摄象机电池、各种仪器仪表电池等），实时监测电池容量、使用时间、使用次数等，此技术目前处于国际领先水平；（2）各种仪器设备的外置电源产品，大功率、智能化、超轻超薄、无记忆效应、多路电压输出；（3）锂电池保护线路，一串、二串、三串、四串保护线路，可以根据客户的要求设计；（4）充电器，公司开发了一串、二串、三串、四串锂电池各种不同功率的充电器和车载充电器；产品系列：*镍氢可充电电池系列------------------------------------*镍镉可充电电池系列*锂离子可充电池系列------------------------------------*各类可充电池组系列*锂二氧化锰电池系列------------------------------------*锂氩硫酰氯电池系列公司本着"诚信为本，科技创新"的理念，贯彻"质量第一，用户至上"的概念，愿与各界人士合作，共同发展和繁荣。

This assay is focuses on part of access network technology. The main contents are as the follows.To discuss the function of the forthcoming copper loop, city cable channels once and twice parameters are analyzed and calculated, and simple analytic model are used to describe the characteristics of channel. The transformation of parameter related to applied HDSL technology in higher band of frequency, and the influences of near reaction and twisted subscriber line are mainly analyzed.

本文针对接入网技术的部分技术进行了分析和讨论，主要内容有以下几部分：为探讨现有的铜线回路的性能，对市话电缆信道的一次参数和二次参数进行了分析计算，并引入简单的解析模型来描述信道特性，其中着重分析了与应用HDSL技术有关的较高频段内参数的变化，邻近效应和用户线扭绞等因素的影响。

We are really "receivers" floating through a kaleidoscopic sea of frequency, and what we extract from this sea and transmogrify into physical reality is but one channel from many extracted out of the superhologram.

我们真的"接收器"浮动通过海上千变万化的频率，和我们此摘录海上和transmogrify分为物理现实是一个通道，但许多中提取出superhologram 。

We designed the multi-channel delay and pulse adjustment circuit based on CPLD providing a solution to fast gating timing and delay problems in large nuclear physic experiments. Its main function is accepting a negative NIM trigger input, and outputting a pulse with adjustable delay and width. Minimum step accuracy of the delay and the pulse adjustment is 10ns when the system frequency is 100MHz.

针对大型核物理实验中的符合测量、多路时间测量系统中的门控快定时信号等应用的需要，设计了一种多路延迟／脉宽调节电路，主要功能是对输入的多路快信号进行延迟和脉宽调节，支持NIM负信号输入和输出，在系统主时钟频率为100MHz的时候，延迟和脉宽调节的最小步进精度为10ns。

The frequency range and distortion model affected by Faraday rotation were analyzed. A kind of calibration algorithm was introduced, in which trihedral corner reflectors were used to calibrate POLSAR image subject to channel imbalance, Faraday rotation and RCS distortion. [2]Three kinds of target decomposition theorems used to extract polarimetric features of SAR image were studied in detail. A kind of POLSAR MLC image data decomposition method based on classical coherent decomposition theorem of POLSAR SLC image was introduced, which was used to extract polarimetric features of POLSAR MLC image.

当工作频率小于1GHz时，法拉第旋转是影响低频星载极化SAR图像定标的一个重要因素，论文分析了受法拉第旋转影响的波段范围和误差模型，提出了一种校正通道不平衡度、法拉第旋转和绝对幅度增益的极化定标算法，仅使用一种点目标——三角反射器作为定标体，应用于受法拉第旋转影响的极化SAR图像定标； [2]深入研究了三类用于SAR图像极化特征提取的目标分解理论。

Communications functions range from basic ultrahigh/very high frequency to single channel ground and airborne radio system and Have Quick. The aircraft also supports several datalinks for communications and situational awareness such as Link 16 and a specialized multi-array datalink for stealthy communications between aircraft.

通信系统功能有甚高频/超高频频段通信，单通道空地无线电系统以及"Have Quick"跳频通信。F-35还支持多种通信和战场感知数据链，例如16号链以及一条用于战机间保密通信的多阵列数据链。

The radio channel is time-variant, frequency-selective and noisy, so the received OFDM signals are corrupted by intercarrier interference.

但是由于无线信道的多径性和时变性，造成了接收端 OFDM 符号子载波间的干扰，为了能够准确地解调 OFDM 信号，就必须对接收到的信号进行信道估计。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。