With a direct implementation approach, the component itself implements decoding and encoding.

使用直接实现方式，组件自己实现解码和编码。

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With a delegated implementation approach, the component delegates to a renderer that does the encoding and decoding.

使用委托实现方式，组件委托渲染器进行编码和解码。

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It analyses passing mechanism of iterative message stream and process of iterative decoding. Finally, an implementation of decoding algorithm is given.

分析了迭代消息流传递机制和迭代解码过程，最后提出一种具体可实现的解码算法模型。

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