Analysis and testing results show that the direct digital synthesis DDS yard has a precise clock and good stability. The balance BPSK modulator suppresses carrier waves well and has little signal scattering. The frequency spectrum...
分析和测试结果表明，直接数字合成DDS技术产生码的时钟精度高、稳定度好；平衡BPSK调制器载波抑制良好、信号杂散较小、频谱分布及主旁瓣比接近理论值。
The performance of the vector modulator is proved by experimental results. In addition, applications of the vector modulator in practical systems such as adaptive antenna array are presented, with its calibration method to improve carrier and sideband suppression.
最后给出了矢量调制器的测试结果和它在自适应天线阵等实际系统中的应用情况，并讨论了用于提高载波和边带抑制、满足高精度要求的校准方法。
The modulator (25) may also include an offset circuit (24) so that the modulated waveform includes a carrier frequency indicator.
所述调制器(25)还可以包括偏置电路(24)，使得调制波形包括载频指示符。
A communication modulator approach according with transmission characteristics of low voltage power line carrier channel is proposed and QPSK modulating technology is adopted to make a low voltage power line carrier communication system which has good performance on attenuation resistance and interference resistance.
设计了以PL3201为核心的载波通信功能模块，针对该芯片提出一种符合我国低压电力线载波信道传输特性的通信调制方法，采用QPSK调制等技术自制了一个低压电力线载波通信系统，其抗衰减和抗干扰的性能其有校大的优势，实验结果表明利用220V低压电力线进行数字信号的传输是切实可行的。
Utilizing an external modulator, we can up-converse vector signals without electrical mixer based on single side band with carrier suppression.
我们提出了一个新颖的全光升频直接侦测多级格式正交多频分工系统。
Alternatively, the un-modulated transmit frequency signal serves as the carrier signal input to a quadrature modulator, which imparts I/Q modulations to it, thereby producing a modulated carrier signal for input to a linear power amplifier.
备选地，未调制发射频率信号用作正交调制器的载波信号输入，正交调制器对它施加I/Q调制，由此产生用于输入到线性功率放大器的调制载波信号。
The sender's voice is adjusted with a photo modulator and then is sent out through infrared light as the carrier.
发送端话音用光调制器进行调制。调制后用远红外光做载体传送。
Direct Digital Frequency Synth esizer is used to synthesize the carrier frequence, and the carrier frequence is adjuste d by modifying frequency control word of DDS. The baud rate of digital modulator is also adjusted by modifying divider factor of programmable divider.
利用直接数字频率合成器来合成调制器的调制频率，通过修改DD S的频率控制字，控制调制频率变化；通过修改可编程分频器的分频因子，控制波特率的变化。
The bpsk modulator of 220MHz carrier is consist of local oscillator and modulator.
本文以集成锁相环ADF4360-8为本振，以双平衡混频器为调制器，实现了220MHz载波的bpsk调制。
Furthermore, a modulator (25) may generate a modulated waveform based upon the information signal, a carrier signal having a frequency and phase associated therewith, and at least one carrier phase reference symbol.
此外，调制器(25)可以基于信息信号、具有与之相关联的频率和相位的载波信号、和至少一个载波相位基准符号产生调制波形。
The insertion loss of a T-type attenuator is theoretically analyzed. AT-type RF CMOS (complementary metal-oxide-semiconductor) attenuator is designed as an on-off keying modulator in a time-hopping ultra wide-band communication with a carrier frequency of 4 GHz.
对T型衰减器的插入损耗和衰减性能进行了理论分析，在此基础上设计了一个用于跳时超宽带通信的载波频率为4GHz的通断键控调制器。
Theoretically, the higher the carrier frequency of PWM modulator of audio amplifier, the better the acoustical effect is.
理论上音频功率放大器的PWM调制器的载波频率越高，音质效果就越好。
Design of Frequency Synthesizer for Shortwave Band Frequency Hopping Based on DSP modulator carrier
色度副载波基准频率基于DSP的短波跳频频率合成器的设计
Δ fam in relation to the carrier and, modulator frequencies, to the depth and duration of amplitude modulation, and to sound intensity are systematically studied.
本工作系统地研究了豚鼠△f（am）与载波频率、调制波频率、调幅深度、调幅时程、声音强度等的关系。
Considering the impact of microwave circuit's distributed parameter to carrier phase, a method of phase compensation is given to obtain the amplitude modulator in X-band. Analyzes the impact of phase error to output signal. Then circuit design is presented and simulation result is obtained.
考虑微波电路分布参数对载波相位的影响，提出了采用相位补偿方法实现X波段的调幅器，分析了相位误差对输出信号的影响，并给出了电路设计和仿真的结果。
There is some research on this scheme these years, such as the impact analysis of I/Q modulator error on carrier flatness and signal-to-noise ratio (SNR), and optimization design of the multi-carrier source.
近几年来，有很多针对该多载波光源系统的研究，这其中包括I／Q调制器的误差对载波平坦性及信噪比的影响分析，以及针对该多载波光源的最优化设计。
A novel scheme for optical millimeter (mm) - wave generation with optical carrier suppression (OCS) modulation by external modulator in a radio-over-fiber (ROF) system was proposed.
提出了一种改进的光载波抑制产生光毫米波的方法。
A Study on Optimum Carrier Suppression of the Microwave Ferrite Modulator
微波铁氧体0-π调制器最佳载波抑制度的研究
In order to improve the carrier suppression factors Psup of the microwave ferrite modulator, the condition for maximum energy translation from the carrier to the sideband has been found through a mapping process by which a message space is mapped onto a signal space.
本文从提高微波铁氧体调制器的载波抑制度P（？）出发，从信息空间到信号空间的一般映射过程中找出载波能量最大限度转移到边带的条件。
The test result indicates that the phase modulator without transformer can suppress the carrier wave.
实测结果表明，这种无变压器环形相位调制器能较好地抑制载波。