V2EX hard-decision-decoding

Hard-Decision Decoding

释义 Definition

硬判决译码/硬判决解码:在数字通信或纠错编码中,接收端先把收到的模拟/软信息(如电压、置信度)直接判成离散的 0/1 或符号(即“硬判决”),再据此进行译码(decoding)。它实现简单、计算量较低,但通常比利用置信度信息的软判决译码(soft-decision decoding)纠错性能弱。

发音 Pronunciation (IPA)

/hrd dsn dkod/

例句 Examples

The receiver uses hard-decision decoding to keep the implementation simple.
接收机采用硬判决译码以保持实现简单。

Compared with soft-decision methods, hard-decision decoding discards reliability information and may require a higher SNR to reach the same error rate.
与软判决方法相比,硬判决译码会丢弃可靠性(置信度)信息,因此可能需要更高的信噪比才能达到相同的误码率。

词源 Etymology

该术语由三部分构成:hard(“硬的/不带程度的”)+ decision(“判决/判断”)+ decoding(“译码/解码”)。在通信工程语境中,hard decision 指把连续接收值“一刀切成离散符号;decoding 源自 code(编码)加前缀 *de-*(去除/反向),表示从编码结果中恢复信息。

相关词 Related Words

文学与著作 Literary Works

  • Digital Communications(John G. Proakis, Masoud Salehi)
  • Information Theory, Inference, and Learning Algorithms(David J. C. MacKay)
  • Channel Codes: Classical and Modern(William E. Ryan, Shu Lin)
  • Modern Coding Theory(Tom Richardson, Rüdiger Urbanke)
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