Photonics involves generation, modulation, transmission and processing of light.
光电学涉及光的产生、调制、传输和处理。
The digital transmission system Q factor-a new concept may be used to analyse the characteristics of digital transmission systems with different kinds of modulation.
数字传输系统的品质因数Q—这个新概念可以用于具有各种调制的数字传输系统性能的分析。
Meanwhile, modulation schemes for deep space communication are provided based on channel features and requirements on data transmission rates.
同时，根据信道特点和数据传输速率的要求给出了深空通信的调制方式。
Modulation technique is very meaningful for the digital data transmission efficiency.
调制技术对数据传输效率有重要的意义。
OFDM (Orthogonal Frequency Division Multiplexing) is a new modulation technology, it is suitable to high-data-rate transmission in the wireless transfer channel with multi-path transmission.
正交频分复用(OFDM)是一种新型调制技术，特别适合在多径传播的无线移动信道中高速传输数据。
Finally, the simulation results show that the adaptive modulation system can theoretically achieve high throughput performance, and low transmission outage probability under certain conditions.
仿真结果表明，自适应调制系统可以获得较高的数据吞吐量，而其传输中断率在一定条件下可以保持较低的水平。
Signal modulation is the last physical part of DTV Front-End, which directly determines the quality of network transmission.
信号调制是数字电视前端最后的一个物理环节，直接决定信号在网络中传输的质量。
Due to additive relative motion between ground jamming emitters and SAR, the spurious phase modulation of transmission signal is produced.
地面干扰发射机和SAR之间的附加相对运动，产生了传输发射信号的寄生相位调制。
Compared with the traditional scheme of single-carrier modulation, OFDM technology has more effective anti-jamming ability and achieves higher transmission rate.
与传统的单载波调制方式相比，OFDM技术可以有效地抵抗信道多径干扰，提高系统的传输速率。
Mud pulse modulation data flow is thin, but current transmitter as far distance transmission means has been widely applied other field, technology is mature.
泥浆脉冲方法目前应用较多，但数据流量稀疏，电流环技术作为远距离传输手段已被广泛的应用于其它领域，技术成熟。
As a new communication technology, PPM (pulse position modulation) technology can be easily coded, and has a high efficiency of energy transmission.
PP M脉冲位置调制通信技术作为一种新兴的通信技术，具有编码简单、能量传输效率高的优点。
OFDM is a modulation method which was often used in the channels. It has better capability against the fading and can realized parallel transmission.
正交频分复用调制（OFDM）是一种信道利用率很高的调制方式，具有良好的抗衰落能力，可实现并行传送。
On the other hand, adaptive modulation technique can enhance data rate, spectrum efficiency and transmission reliability in MIMO-OFDM systems.
另一方面，对于MIMO - OFDM系统来说，自适应调制技术可以提高系统的数据传输率、频谱效率以及传输的可靠性。
The simulation results predicted that the long-range acoustic communication system which based on MC-PSK modulation could satisfaction the requirements of the information transmission system.
对远程水声通信系统的总体性能进行仿真研究，表明基于MC - PS K调制的远程水声通信系统能够满足远程水声信息传输的技术要求。
At last it discusses the dual-mode transmission technology of the Ultra Narrow Band Modulation and the FM combination.
最后着重讨论了超窄带调制与FM结合的双模式传输技术。
The passive interference in receiving station of amplitude modulation (AM) broadcasting from UHVAC transmission lines is mainly caused by towers.
特高压输电线路对调幅广播台站的无源干扰主要是由垂直杆塔引起的。
This modulation rate of data transmission is expressed as 12,800 baud (Bd), representing 12,800 bits per second.
这种数据传输调制频率用12800波特(Bd)来表示，指的是每秒钟12800位。
According to the CWDM wavelength dependent transmission characteristics, an FBG sensing DE - modulation method was proposed and an experiment system was established.
本文利用粗波分复用器(CWDM)的传输特性与波长的关系，提出了一种FBG传感解凋方法并建立了实验系统。
To avoid excessive transmission distortion, the bandwidth between transmitter and receiver must be at least twice that with digital carrier modulation.
为避免过量的传输失真，发射机与接收机之间的带宽至少要两倍于数字载波调制的带宽。
This distribution pattern of GABA-IR in the bullfrog retina suggests that GABAmay play an important role in transmission and modulation of visual signals in both the outer and inner retina.
上述结果表明，GABA广泛分布于牛蛙视网膜的各层，提示它在视觉信号的传递过程中发挥着重要作用。
Multicarrier modulation is a form of parallel data transmission, which is efficient to reduce the detrimental effects of multipath fading.
多载波调制技术是一种并行数据处理方式，有效地对抗多径衰落，可以提高无线带限信道的数据传输速率。
Endogenous descending inhibitory system plays an important role in the modulation of nociceptive transmission.
内源性下行抑制系统在痛觉传递与调制中具有重要作用。
The influence on grid's transient stability margin and DC system is also studied while the power slope of north or south AC transmission system is taken as modulation signal respectively.
分别取北通道功率变化率及南通道功率变化率为调制信号对系统暂态稳定裕度及直流系统的影响；
The transmission parameters may also specify a modulation type.
传输参数也可用以指定调变类型。
Firstly, this thesis analyzes the transmission characteristics of HF channel, and fixes on the system modulation scheme 2dpsk, according to the comparison of ASK, FSK and PSK (DPSK).
首先，本文分析了短波信道的传输特性，并通过比较A SK、FSK和PS K (DPSK)几种调制方式的特点，确定了2dpsk为系统的调制方案。
Modulation format of signal has become a key technique to enhance the transmission capability of system in the long-distance system.
在超长距离传输时，信号调制格式是可提高系统传输性能的一项关键技术。
This paper describes the major performance and applications of the PFM (pulse frequency modulation) optical fiber transmission equipment for colour TV programs with two accompanying sound channels.
本文叙述PFM彩色电视双伴音传输设备的主要性能和应用。
The transmission spectra drift from the varying of the gratings parameters is due to its modulation to the length of the Fabry-Perot-like.
光栅参数变化产生的透射光谱的漂移是由于其对这种类F—P腔长度的调制。
The transmission spectra drift from the varying of the gratings parameters is due to its modulation to the length of the Fabry-Perot-like.
光栅参数变化产生的透射光谱的漂移是由于其对这种类F—P腔长度的调制。
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