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1·Quadrature Amplitude Modulation (QAM) is used to transfer signals by digital TV system based on DVB_C standard.

基于DVB_C标准的数字电视系统采用正交幅度调制(QAM)传送信号。

2·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。

3·The paper analyzes the interference rejection of Quadrature amplitude modulation signals in the presence of carrier phase jitter, sinusoidal interference and white Gaussian noise.

文章分析了存在载波相位起伏、正弦干扰、高斯白噪声时正交调幅数字系统的抗扰性。

4·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。

5·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。

6·Quadrature Sideband Amplitude Modulation?

正交边带调幅QSAM ？

7·Quadrature Phase and Amplitude Modulation?

正交相位和幅度调制QPAM ？