设计数字基带传输系统，利用MATLAB强大的仿真功能，结合其所具有的图形叠加特性，针对余弦滚降最佳接收系统、部分响应系统进行仿真，通过观察仿真眼图、频谱图、功率谱图以及误码率曲线，检测系统的码间串扰和传输质量。-This article designs the digital baseband transmission system, uses the MATLAB formidable simulation function,unifies graphsuperimposition characteristic which it has,we has simulatived optimal reception of characteristic of roll-off and the partial response system,through the observation to simulation of eye pattern,frequency spectrum,power spectrum,bit error rate,detected　intersymbol crosstalk and the transmission quality to system.