数字基带传输系统的matlab仿真，用4种码型

在数字基带传输系统中，实现误码率及眼图的仿真，从而加强对码间干扰和信道噪声的理解。-In the digital baseband transmission system, to achieve the simulation of the BER and eye diagram, so as to enhance the understanding of the inter-code interference and channel noise.