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1·At the same time, we refrain mirror frequency effectively with the method of digital quadrature modulation (DQM).

同时，由于采用了数字正交调制，从而有效地提高了镜频抑制。

2·The purpose of quadrature modulation is to generate the SSB RF exciting pulse that avoids exciting it's mirror slice.

正交调制的目的是产生单边带RF激发脉冲，以避免激发镜像层面。

3·It is clearly clarified the conceptions of quadrature modulation, quadrature exciting, quadrature receiving, and quadrature demodulation in the MRI system.

阐明了MRI系统中所使用的正交调制、正交解调、正交激发和正交接收的概念。

4·The errors are classified according to their frequency. The amplitude and phase errors of the LFM signal generators using quadrature modulation technology are mapped into baseband.

提出了一种将正交调制LFM信号产生系统的幅相误差映射到基带后，在数字域利用复系数FIR滤波器进行校正的方案。

5·Based on the idea of the Schmidt orthogonalization and the orthogonal chaotic carriers being generated, a chaos-based quadrature modulation communication system is proposed and realized.

基于施密特正交化的原理，在产生正交混沌载波的基础上，提出并实现了一种基于混沌的正交调制通信系统。

6·Firstly the basic transmitter, including convolutional encoding, interleaving, scrambling, Walsh modulation, quadrature spreading and baseband filtering was studied.

首先研究基本的发射机，包括卷积编码、交织、扰码、沃尔什调制、正交扩频以及基带滤波。

7·QAM (Quadrature Amplitude modulation) has been widely used in various digital communication systems due to its high modulation efficiency.

正交幅度调制(QAM)具有较高的调制效率，被广泛应用于各种数字通信系统中。

8·From this point, M-ary Quadrature Amplitude modulation (MQAM), MultiCarrier modulation (MCM) and adaptive modulation techniques are good candidates in next generation mobile radio system.

从这一点出发，多元正交幅度调制(MQAM)、多载波调制(MCM)及自适应调制技术成为下一代移动无线系统中最有竞争力的几种候选技术。

9·Quadrature phase shift carrier modulation is used to represent the four different phase inputs of digital information, is quaternary phase shift keying.

四相相移调制是利用载波的四种不同相位差来表征输入的数字信息，是四进制移相键控。

10·The waveform generator is composed by DSP and quadrature digital upconverter (QDU). DSP is used as main controller to decide the modulation mode and output waveform of QDU.

波形产生器主要由dsp和数字上变频器构成，DS P作为主控制器设定数字上变频器的调制方式和输出波形。