QPSK调制解调仿真 从基带信号产生——IQ映射——调制——信道加噪——解调——判决及反映射——接收信号输出，每个步骤都画出了图形。 -QPSK modulation and demodulation of the simulationFrom the baseband signal generation-- IQ mapping------ channel noise modulation demodulation-- judgment and reflected-- to recei

连续导频正弦波通过存在Doppler频移的快衰落信道复模型（基带等效模型）的构造-Continuous pilot frequency sine wave by the presence of Doppler shift fast fading channel model (complex baseband equivalent model) structure