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有附件A mathematical theory of communication

文献技术官 添加于 2011-6-5 20:18 | 1892 次阅读 | 0 个评论
  •  作 者

    Shannon CE
  •  摘 要

    THE recent development of various methods of modulation such as PCM and PPM which exchange bandwidth for signal-to-noise ratio has intensified the interest in a general theory of communication. A basis for such a theory is contained in the important papers of Nyquist1 and Hartley2 on this subject. In the present paper we will extend the theory to include a number of new factors, in particular the effect of noise in the channel, and the savings possible due to the statistical structure of the original message and due to the nature of the final destination of the information. The fundamental problem of communication is that of reproducing at one point either exactly or approximately a message selected at another point. Frequently the messages have meaning; that is they refer to or are correlated according to some system with certain physical or conceptual entities. These semantic aspects of communication are irrelevant to the engineering problem. The significant aspect is that the actual message is one selected from a set of possible messages. The system must be designed to operate for each possible selection, not just the one which will actually be chosen since this is unknown at the time of design. If the number of messages in the set is finite then this number or any monotonic function of this number can be regarded as a measure of the information produced when one message is chosen from the set, all choices being equally likely. As was pointed out by Hartley the most natural choice is the logarithmic function. Although this definition must be generalized considerably when we consider the influence of the statistics of the message and when we have a continuous range of messages, we will in all cases use an essentially logarithmic measure.
  •  详细资料

    • 文献种类: Journal Article
    • 期刊名称: ACM SIGMOBILE Mobile Computing and Communications Review
    • 期刊缩写: SIGMOBILE Mob. Comput. Commun. Rev.
    • 期卷页: 2001  5 1 3
    • ISBN: 1559-1662
  • 学科领域 信息系统 » 计算机科学

  • 相关链接 DOI URL 

  •  附 件

    PDF附件A mathematical theory of communication 
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