浅析数字基带系统中系统带宽与信息速率的关系

A Brief Analysis of the Relationship between System Bandwidth and Code Speed in the Digital Baseband System

在数字信号的基带传输过程中,信息传输速率和系统带宽是系统的两个重要性能指标。信息传输速率在满足香农公式的条件下还极大地受到码间干扰的限制,为了消除码间干扰,就必须使信息传输速率和系统带宽之间产生确定的约束关系。运用系统冲激响应过零点消除码间干扰的方法对几种常见的基带系统进行了分析,直接给出了信息传输速率和系统带宽之间的比例关系,为实际的应用提供出一种理论指导。

Both system bandwidth and transmission speed of code are very important property parameters in the baseband transmission process for digital signals. Transmission speed of code not only accords with Shannon expressions but also is limited by intersymbol interference.It is necessary to make determinate relationship between system bandwidth and transmission speed of code to avoid intersymbol interference.By analysing several normal systems according to the method of unit-impulse response being zero,their scaling relationship has been explained in this paper,which gives a theoretical guidance for the practical application.