研究码及码字的结构是编码理论的一个重要研究方向。

In coding theory, it is important to study a code and the structure of codewords .

近年来，域上准循环码的研究为编码理论提供了很多丰富的结果。

Recently, the study of quasi-cyclic codes over fields have provided many useful results in coding theory.

近年来, 域上准循环码的研究为编码理论提供了很多丰富的结果.

Recently, the study of quasi - cyclic codes over fields have provided many useful results in coding theory.

从认知心理学的角度分析，它涉及到双重编码理论、加工水平说和激活扩散模型。

KWM involves dual coding theory, depth of processing theory and spreading activation model from the perspective of cognitive psychology.

信道编码理论和信源编码理论.

The channel coding theorem, the source coding theorem.