quadrature carrier

英

美

网络正交载波

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。
Multi-level Quadrature Amplitude Modulation is very sensitive to carrier phase noise.
多电平QAM调制对载波的相位噪声非常敏感。
Quadrature amplitude modulation ( QAM) is a way of carrier transmission that has high spectrum efficiency and is easily implemented.
正交幅度调制（QAM）是一种频谱利用率高、实现较为方便的载波传输方式。
In order to acquire and track the spread spectrum signal rapidly, the changing band-width tracking strategy is adopted, which uses the quadrature frequency discriminator, Cross Product and Costas together to keep the carrier loop.
为了能够快速地对扩频信号进行捕获跟踪，采用了四相鉴频器、符号叉积频率跟踪算法和科斯塔斯环混合进行载波跟踪的变带宽跟踪策略。
The DPSK modem used the differential coherent detection to complete data demodulation, while, the QPSK modem used quadrature coherent demodulation based on carrier synchronization.
其中，DPSK系统采用差分相干解调的方式完成数据解调，而QPSK系统则采用相干解调方案，其难点在于载波同步的实现。