The traditional differential space-time block code (DSTBC) suffers from the signal constellation expansion for QPSK modulation.
传统的差分空时分组编码(DSTBC)在QPSK调制时存在着信号星座扩展。
The shaping of a signal constellation by selecting the boundary of the signal set is used to reduce the average energy of the constellation.
由选定信号集边界的信号星座成形用于降低该星座的平均能量。
After the unequal error protection of multilevel coded modulation is discussed in detail, a non-uniform signal constellation applied to 8ask modulation is designed.
在详细分析了多级编码调制的不等错误保护原理的基础上，设计了一种针对8ask调制的非均匀信号星座。
The modulation recognition technique of QAM signal by the constellation diagram is given in this paper.
给出了利用信号星座图的QAM信号调制方式识别技术。
It is necessary to analyze and design the intersatellite link (ISL) for satisfying the requirement of time synchronization signal transmitting in satellite constellation time synchronization.
在卫星星座内的时间同步中，为满足时间同步信号的传输要求，需要对星间链路进行分析和设计。
In the scheme, a set of feature parameters are extracted from signal spectrum and constellation based on the differences between digital mixed signals and common digital modulation signals.
该方案利用数字混合信号与常用数字调制信号在信号频谱以及星座点的差异提取特征参数进行自动识别。
This method is robust to Gaussian noise and constellation rotation due to initial phase of signal and avoids overfitting and local minimum in neural networks.
这种方法对高斯噪声和星座图由于信号初始相位而引入的旋转具有良好的稳健性，并避免了神经网络中的过学习和局部极小点等缺陷。
Its basic idea is to partition the constellation optimally by coding, so that the maximal distance between the modulated signal vectors can be obtained.
它的中心思想是：采用编码的方法将信号空间做最佳划分，使的已调信号矢量端点之间有最大的欧式距离。
Its basic idea is to partition the constellation optimally by coding, so that the maximal distance between the modulated signal vectors can be obtained.
它的中心思想是：采用编码的方法将信号空间做最佳划分，使的已调信号矢量端点之间有最大的欧式距离。
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