无码间串扰基带传输系统的仿真设计

The Simulation Design of Baseband Transmission System without InterSymbol Interference

阐述了基带传输系统相关原理,并给出一种基于Matlab的无码间串扰基带传输系统仿真设计与性能分析方法。仿真研究结果表明,在高斯噪声方差(Variance,缩写Var)取0.01 W条件下,系统模型单次仿真最佳时间为20 s;此时仿真数据点数充足,数据传输可靠,所得误码率为0.007005;接收滤波器输出信号线迹清晰,眼图规整。从系统误码率曲线来看,当Var<0.1 W时,误码率小且变化平缓;当Var<0.7 W时,误码率<0.02,变化也较平缓;但是当Var>0.7 W时,误码率随噪声方差增大而明显地增大。

The related principles of the baseband transmission system are expatiated,and a method for simulation design and per⁃formance analysis of the baseband transmission system without InterSymbol Interference(ISI)based on Matlab is given.Simulation re⁃sults show that with the variance(Var)of Gaussian noise setting 0.01W,the optimal time for a single simulation of the system model is 20 seconds.The number of simulation data points is sufficient,the data transmission is reliable,and the bit error rate obtained is 0.007005.The output of the receiving filter has clear lines and regular eye diagrams.From the bit error rate curve obtained,when Var<0.1 W,the bit error rate is small and the change is gentle;When Var<0.7 W,the bit error rate is<0.02,and the change is relatively gentle;However,when Var>0.7 W,the bit error rate increases significantly with increasing noise variance.