说明：  no intro
(matlab realize a number of the basis of procedures and reports and have flow chart (1) mapped sinusoidal signal waveform and spectrum. (2) unipolar return-to-zero (RZ) waveform and its power spectrum, 50 duty cycle. (3) Raised Cosine rolloff waveform eye diagram and power spectrum. Roll-off factor of 0.5. Send code values for the 0,2 million. (4) the best base-band system Pe ~ EbNo curve, raised cosine roll-off factor a = 0.5, sampling bias is the value of Ts/4. (5) Pe ~ EbNo, raised cosine roll-off factor a = 0.5, sampling time deviation, but the channel is a multipath channel, C (f) = abs (1-0.5* exp (-j* 2* pi* f* dt)), dt = Ts/2. (6) Simulation of digital baseband transmission system, including input and output signal waveforms and power spectrum, eye diagram (raised cosine roll-off factor a = 0.5), Pe ~ EbNo curve, sampling time deviations.)