Unìt1-TheEvolutìonofCommunìcatìonTheorìes.pptVIP

The increase in noise, can in priciple, be compensated for by increasing the signal power S, but again this has the disadvantage that a channel’s increase in signal power is another channel’s increase in interference and hence noise. compensate：补偿 原则上，噪声的增加能够通过增加信号功率 S 来补偿，但是有一个缺点：一个信道的信号功率的增加意味着对另一个信道干扰（噪声）的增加。 Page 28 课文 第1、2、3段 Page 31 Exercises 2 The average information content of a binary sender is known as its entropy H, and is related to the information content of each message as defined by Equation 1 and their related probabilities. This is expressed in Equation (2). （2） entropy ：熵 be known as：被称为 平均信息量的二进制表示被称为熵 H ，它与每条消息的信息量和发生概率有关。如等式表示。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. The channel capacity theorem relates the maximum rate of transmission , expressed in terms of binary bits per second for a digital communication channel, to those resources used to transport the signals and the environment for the transmission. relate…to：显示出…与…的关系 resource： 消息来源 信道容量准则显示出最大传输速率与传送信号的资源及传输环境之间的关系，对数字通信信道，最大传输速率以每秒的二进制位表示。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. In the model, signals are used to represent messages and they take a form that is the most suitable for the transmission medium. The entities used to model the resources are the signal power S, the time taken to transmit the signal T, and finally the bandwidth or capacity of the channel B. The aspects of the environment that are considered are those that distort or interfere with the signals. distort：失真 interfere：干扰 在该模型中，信号被用来表示消息，并采用最适合于在传输媒介中传输的形式。用来建模的资源中，实体是信号功率 S ，传输时间 T 以及信道容量或带宽 B 。考虑的环境因素是信号的失真或信号干扰。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. These aberrations are m