在维特比译码器译码时，应用信道状态信息(CSI)，可以明显提高系统性能。
The performance can be improved greatly by using the channel state information (CSI) in Viterbi decoder.
维特比译码器（81） 通过更改后的维特比算法对接收符号（50）进行译码。
The Viterbi decoder (81) decodes the received symbols (50) by means of a modified Viterbi algorithm.
减阶单元(80)使用该附加信息将维特比译码器(81)进行的译码限制为特定的后续阶。
The stage reduction unit (80) USES the additional information to limit the decoding by the Viterbi decoder (81) to certain subsequent stages.
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