The intermediate frequency circuit includes QPSK modulation based on HFA3724, PLL circuit based on MB1502.
中频部分主要由HFA3724正交调制解调器和基于MB1502的锁相频率合成电路等组成。
Therefore, the study of all-digital QPSK modulation and demodulation based on FPGA has important significance.
因此，基于FPGA的全数字QPSK调制解调的研究具有重要的意义。
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。
In the rainfall circumstance the probability distribution of satellite channel capacity is analyzed in QPSK modulation and 4qam modulation.
在降雨环境中，进一步研究了卫星通信系统在QPSK调制和4qam调制下的信道容量的概率分布。
The effect on modulation and demodulation of QPSK via carrier phase noise can not be ignored, and it is difficult to analyze.
载波相位噪声对QPS K调制解调的影响是不可忽略的，也是难以分析的。
The modulation technology of the third generation mobile WCDMA system including the QPSK is introduced in this paper, including the QPSK.
介绍第三代移动通信WCDMA系统的调制技术，包括QPSK 调制和解调的基本原理，以及WCDMA 系统的调制方式。
Having realized the modulation and demodulation algorithm of ASK, FSK, QPSK on the software radio platform, and has provided the modulation and demodulation flow chart and the main part procedure.
在软件无线电平台上研究并实现了ASK、FSK、QPSK等方式的调制解调算法，并给出了调制解调的流程图和主要部分的程序。
The technology of QPSK has been applied in a lot of fields, it's the main modulation method in some big system.
QPS K调制技术应用相当广泛，已成为许多大型系统的主要调制手段。
QPSK as an advanced digital modulation technique is fit for the digital satellite communication system well.
QPSK作为一种先进的数字调制方式，特别适用于数字卫星通信系统。
QPSK as an advanced digital modulation technique is fit for the digital satellite communication system well.
QPSK作为一种先进的数字调制方式，特别适用于数字卫星通信系统。
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