通信电路与系统实验
班级: 学号: 姓名:
1-1. 简单基带传输系统分析
(1) 实验目的
掌握观察系统时域波形,特别是眼图的操作方法。
(2) 实验内容
构造一个简单示意性基带传输系统。以双极性PN码(伪噪声Pseudo-Noise: PN)发生器模拟一个数据信源,码速率为100bit/s,低通型信道噪声为加性高斯噪声(标准差=0.3v)。要求:
(3) 系统参数
编 号 0 1 2 3 4 5 6 7 8 9 10 11 12 图符块属性 (Attribute) Source Comm Adder Source Operator Operator Operator Operator Source Sink Sink Sink Sink 类型 (Type) PN Seq Pulse Shape -- Linear Sys Sampler Hold Compare Sinusoid Analysis Analysis Analysis Analysis 参数设置 (Parameters) Amp=1v,Offset=0v,Rate=100Hz,Levels=2, Phase=0 deg Gaussian,Time Offset=0 sec,Pulse Width=0.01 sec,Std Dev=0.3v. -- Butterworth Lowpass IIR,5 Poles,Fc=200Hz. Interpolating,Rate=100Hz,Aperture=0 sec, Aperture Jitter=0 sec, Last Value ,Gain=2,Out Rate=10.e+3Hz Comparison=’>=’,True Output=1V,False Output =0v,A input=t6 Output0,B input=t8 Output0 Amp=0v,Freq=0Hz,Phase=0 deg Input from t0 Output Port0 Input from t1 Output Port0 Input from t4 Output Port0 Input from t7 Output Port0 Gauss Noise Std Dev=0.3v,Mean=0v. (4) 系统框图
(5) 实验结果
SystemView01100.e-3Sink 9200.e-3300.e-3400.e-3500.e-30edlitupmA-500.e-3-10100.e-3200.e-3300.e-3400.e-3Time in Seconds
SystemView01100.e-3Sink 10200.e-3300.e-3400.e-3500.e-30eplitudmA-500.e-3-10100.e-3200.e-3300.e-3400.e-3Time in Seconds
SystemView0100.e-3Sink 11200.e-3300.e-3400.e-31500.e-30eplitudmA-500.e-3-10100.e-3200.e-3300.e-3400.e-3Time in Seconds
SystemView01800.e-3600.e-3400.e-3200.e-300100.e-3200.e-3300.e-3400.e-3100.e-3Sink 12200.e-3300.e-3400.e-3eplitudmATime in Seconds
SystemViewOverlay w4: Power Spectrum of Sink 9 (dBm 50 ohms), w5: Power Spectrum of Sink 10 (dBm 50 o08001.6e+32.4e+33.2e+34.e+34.8e+30-50mBr dewoP-100-15008001.6e+32.4e+33.2e+34.e+34.8e+3Frequency in Hz (dF = 1.221 Hz)
SystemViewSliced w1 (Ts=0s, dT=50.e-3s)010.e-320.e-330.e-340.e-31500.e-30edlitupmA-500.e-3-1010.e-320.e-330.e-340.e-3Time in Seconds