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QPSK_oQPSK
- 本程序,包含QPSK,OQPSK的产生过程,I、Q领路信号抽取,他们的频谱,包络情况,经过带通滤波器后的变化,经过非线性放大器后的频谱变化等。是一个很好的学习例程!-This procedure, including QPSK, OQPSK production process, I, Q signal extraction lead the way, their spectrum envelope case, after band-pass filter after the change, t
lock-in_amplider
- 锁定放大器是利用相关技术从噪声中提取微弱信号的常用方法之一。可以证明,当信号的频率和相位已知时,使用相关检测技术能使输出信号信噪比最大。数字锁定放大器比模拟锁定放大器具有稳定、精度高等优点,并且数字滤波器的通带可以设置的非常窄,以便滤除噪声。-Lock-in amplifier is a common method using correlation techniques extracting weak signals the noise in. It can be shown when th