The performance estimation of quadrature phase shift keying ( QPSK ) signaling over a Rice lading channel was simulated and the corresponding analyzing results were obtained. 最后,对数字调制后的QPSK信号通过莱斯衰落信道时的性能进行了仿真估计,并得到相应的分析结果。
Feher patented Quadrature Phase Shift Keying(QPSK) ( FQPSK ), which is suitable for deep space communication, is introduced at first. 首先介绍了适用于深空通信的费赫尔正交移相键控(FQPSK)调制技术。
IJF-OQPSK is actually to modulate the IJF codes by the Offset Quadrature Phase Shift Keying(QPSK). IJF&OQPSK实际上是对IJF信号再进行正交四相相移键控的调制技术。
For quadrature phase shift keying ( QPSK ) modulation technique, a baseband DBF algorithm of smart antenna fixed beams is presented. 针对四相相移键控(QPSK)调制方式,本文提出了一种新的智能天线固定多波束基带DBF算法。
In order to make the limited spectrum range accommodate more communication channels, some linear modulation techniques are proposed, such as QAM ( Quadrature Amplitude Modulation ), QPSK ( Quadrature Phase Shift Keying(QPSK) ), etc. 为了让有限的频谱范围能够容纳更多的通信信道,人们提出了一些线性调制技术,如:QAM(quadratureamplitudemodulation)、QPSK(quadraturephaseshiftkeying)等。