查询词典 multiplexing unit

Inherent inter-symbol and inter-carrier interference elimination ability of orthogonal frequency division multiplexing system attribute to its cyclic prefix. But the case of multipath fading channels whose the channel impulse response length exceeds the duration of cyclic prefix causes intersymbol interference and intercarrier interference, which may degrade system performance severely.

正交频分复用系统中的循环前缀具有一定的抗码间干扰和子载波间干扰的能力，但是当多径衰落信道的最大信道脉冲响应长度超过了循环前缀长度时，OFDM系统的性能将会严重下降。

For orthogonal frequency division multiplexing systems in high-mobility environment, channel variations within one OFDM symbol will introduce intercarrier interference, thus lowering the system performance.

对於应用於高移动通讯环境之正交分频多工(Orthogonal Frequency Division Multiplexing， OFDM)系统，每一个OFDM符元期间的通道时变导致载波间干扰(Inter-carrier Interference， ICI)发生，使得系统效能降低。

To reduce the receiver complexity,a differential space-frequency transmit diversity scheme was developed with a noncoherent detection method based on the frame structure of the time domain synchronous-orthogonal frequency division multiplexing system.

在采用相干检测方法的发射分集方案中，进行信道估计需要付出很高的代价，为了降低接收端的实现复杂度，根据时域同步正交频分复用系统结构的特点，提出了差分空频发射分集及相应的非相干检测方法。

The devices are piezoelectrically tuned. The devices would be largly used for signal processing, sensor, wavelength division multiplexing systems, coherent communication systems, and particularly optical frequency division...

滤波器采用压电元件调谐，在信号处理、传感器、波分复用系统、相干光通信系统、特别是近几年才发展起来的光频复用系统中将得到广泛的应用。

A thermometric model is established and proved by experiment. After researching many Multiplexing technologies, an anti-crosstalk method is given.

在以往使用的形状复用方法的基础上，本文提出了一种抗串扰的方法。

The system is advangeous in reliability, expansibility, transplantability and multiplexing.

系统具有高可靠性、可扩展性、可移植性和可重用性的特点。

The unflatness of amplified spontaneous emission noise and its impacts imposed on the performance of the off-center narrow filter polarization-nulling method when monitoring the in-band optical signal-to-noise ratio of dense wavelength division multiplexing system are analyzed, and a modified method by introducing an unflat factor in the calculation of OSNR is proposed.

分析了累积自发辐射噪声的非平坦特性，在已有窄带离心偏振置零法测量波分复用系统中带内光信噪比的基础上，分析该方法在噪声非平坦条件下存在的问题，提出了在光信噪比的计算中引入修正因子。

The establishment of more than 10 years, met with many world-renowned manufacturers with the industry has established close cooperation and technological exchanges and relations, the main products are: the United States and Tellabs production company Focus series SDH synchronous transmission systems and optical wave-division multiplexing Use optical transmission systems, France SEGAM the FMX series of PCM products in the domestic exclusive Newbridge Networks of Canada to introduce production technology and production lines produced by the PCM MainStreet 3630 Intelligent Terminal; Canada to introduce advanced SCADA system on its own Development of a national advanced level of 9700,9800 series of intelligent digital access equipment.

成立10多年来，先后与许多国际知名同行业厂商建立了密切的技术交流与合作关系，主要产品有：与美国Tellabs公司合作生产的Focus系列SDH光同步传输系统及密集波分复用光传输系统、法国SEGAM的FMX系列PCM产品；在国内独家引进加拿大新桥网络公司生产技术和生产线所生产的 MainStreet 3630智能化PCM 终端；引进加拿大先进的SCADA系统；自行研制的具有国内先进水平的9700、9800系列数字智能接入设备。

They are①ANN based nonlinear coding method to reduce coding delay②the conversion method of CBR streams to VBR streams to make the packeting delay negligible③human perception based main and subordinate packet method to reduce the influence of packeting delay④cell selective discarding and datagram selective shorten method to reduce queuing delay by alleviating the load of links⑤multitask cell or datagram multiplexing method to reduce packeting delay.

作者研究的重点，在于提出了若干降低编码、信息分组装配和分组排队时延的新方法，它们是：降低编码时延的ANN非线性编码法、大幅度降低分组装配时延的CBR码流VBR转换法、基于人耳听觉特性的主次信息分组装配降低时延法、新的降低排队时延和网络拥塞状态的信元选择性删除和数据报选择性截短适配法，以及降低分组装配时延的多任务复合装配法。

This paper describes and discusses sub-carrier multiplexing, optical carrier suppression and separation, quartered modulation technologies, compares and analyzes not only the strengths and limitations of these technologies, but also the vista of practical application.

本文介绍多种光标记交换技术，包括副载波复用、载波抑制和分离、正交调制，比较各自的优缺点及实用前景。

The statistical analysis of this large set of mutations has led us to propose a diagnostic strategy that should help with the molecular work-up of optic neuropathies.

这一大系列基因突变的统计学分析引导我们提出一个诊断策略，可以帮助我们对视神经病变进行分子学的诊断检查。

The results show that the pipe grouting changes the mechanical parameters of surrounding rocks to achieve the security of engineering objectives by reinforcing surrounding rocks and bolcking the water.

研究表明：小导管注浆一方面改变了围岩的力学参数，另一方面利用浆液的固结特性可以实现堵水和加固围岩的工程目标，使隧道在开挖过程中的安全得到保障。