一个有关qpsk的调制。系统的性能仿真。-1. system diagram

2. Input baseband waveform and its power spectrum

3. QPSK modulated signal and its power spectrum

4. AWGN channel output and its power spectrum

5. Signal constellations before and after the Rayleigh channel

6. Error performance (BER-EbNo curves) under the AWGN and

Rayleigh (Ricean, optional) fading channels, together with the

theoretical AWGN curve. All BER-EbNo curves should be drawn in

one figure with the same scaling.