DP-QPSK Modulation 双极化四相相移键控调制
offset QPSK modulation 偏移四相移键控调变
orthogonal QPSK modulation 正交QPSK调制
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。
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