The primary function of the optical transmit antenna is to collimate far-field divergence of the laser beam and reduce the size of the laser beam in .
激光发射天线作为激光整机系统中的一个关键性部件,其特性研究受到越来越多的关注。
Then multiple transmit and single receive antenna system (MISO systems) combing turbo product code with space time block code (STBC) in Rayleigh flat-fading channels obtained by STBC as an inner code.
讨论了Turbo乘积码编码,研究了Turbo乘积码与空时分组码相结合的多发射天线单接收天线系统(MISO)在平坦瑞利衰落信道下的性能,这里Turbo乘积码作为外码提供编码增益,采用两个相同的扩展汉明码(64,57)构成;空时分组码作为内码提供分集增益,对于二根、三根和四根发射天线的系统空时分组码编码器的码率分别为1,1/2和1/2,空时分组码译码采用最大似然译码方式和理想信道估计。
The combination of MIMO and OFDM techniques is regarded as one of the best transmission method in the future wireless broadband communication.
多天线发送多天线接收(MIMO)和正交频分复用(OFDM)两种技术的结合被认为是未来无线宽带通信最有效的传输技术之一,既可以很好的解决未来宽带无线通信系统中信道的多径衰落和带宽效率这两个最严峻的挑战,又能够提高系统容量和传输可靠性。
In this area,OFDM technology and MIMO technology has aroused.
随着无线移动通信的发展,人们对于无线通信系统的传输速率和系统容量提出了越来越高的要求;然而有限的频谱资源成为制约移动通信发展的瓶颈,因此在保证可靠传输的前提下,如何提高频谱效率成为当今无线通信领域研究的重点课题;在此领域,OFDM技术和MIMO技术引起了专家学者的广泛关注;多天线发送多天线接收(MIMO)和正交频分复用(OFDM)两种技术的结合被认为是未来无线宽带通信最有效的传输技术之一,既可以很好的解决未来宽带无线通信系统中信道的多径衰落和带宽效率这两个最严峻的挑战,又能够提高系统容量和传输可靠性,所以MIMO-OFDM成为4G核心技术首选方案,而定时同步和频率同步是影响MIMO-OFDM系统性能的关键因素。
Optoelectronic Detecting of Optical Properties of Optical Transmit Antenna;
激光发射天线光学性能的光电探测研究
x ray excited optical fluorescence
x射线激发光学荧光
gamma excited x ray fluorimeter
射线激发x光荧光仪
Influence of Transmitting Antenna's Aberration on Laser Propagation for Space Optical Communication
空间光通信中发射天线像差对激光传输的影响
proton excited X-ray spectrometry
质子激发Ｘ射线光谱法
To function as a laser; emit coherent radiation by the action of a laser.
放射激光起激光器作用，通过激光的运转发射连续的射线
radioisotope induced x ray fluorescence
放射性核素激发x射线荧光法
photon excited x ray fluorescence analysis
光子激发的x射线荧光分析
All rays leaving the laster are in phase.
由激光发射出的光线都是同位的。
proton-induced X-ray emission analysis
质子激发x射线荧光分析
Studies on Performances of THz Waves Emitted by Photoconductive Antenna under Strong Excitation;
强激励条件下光导天线THz辐射特性的研究
stimulated emission pumping spectroscopy
受激发射激发光谱学
Designing of Optical Transmitting and Receiving Circuits in the Wireless Laser Communication System;
激光无线通信光发射与接收电路的设计
Laser Emission and Receive Technology for Optical Wireless Communication System
无线光通信系统中的激光发射与接收技术
x ray photoemission diffraction
x射线光电发射衍射
X-ray fluorescent emission spectrometer
X射线荧光发射光谱仪
fiber optic AM laser transmitter
光纤调幅激光发射器
laser-probe emission spectrometer
激光探头发射光谱仪