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通信系统的不断改进在于提高通信效率和提高通信的可靠性。对通信机的设计者来说,在信道给定的条件下,努力的方向就是不断地提高信息传输速率,同时使误码率尽量地减小。在实际通信中,输入的原始基带脉冲必须经过适当的变换,才能适合于信道传输的基带脉冲,这种变换通常是由二部分组成:一是脉冲极性转换器,二是脉冲波形变换器。经变换后的基带信号既有利于降低接收时的误码率。又有利于节约占用的信道频带宽度。
The continuous improvement of the communication system lies in improving the communication efficiency and improving the reliability of the communication. For communicator designers, under the conditions given by the channel, the direction of their efforts is to continually improve the information transmission rate while minimizing the bit error rate. In the actual communication, the input of the original baseband pulse must be properly converted to be suitable for the baseband transmission of the channel pulse, the transformation is usually composed of two parts: one pulse polarity converter and the other is a pulse waveform converter. The converted baseband signal not only helps to reduce the bit error rate during reception. But also conducive to saving the occupied channel bandwidth.