在计算机网络通信中，为了降低数据通信线路传输的误码率，可以采用一种差错检测控制———循环冗余码校验(CRC)。

In this paper, it studies one of the error-check controls of the communications of computers network-Cyclic Redundancy check (CRC).

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为了降低低密度奇偶检验码的误码平底，提出一种基于陷阱集状态检测的两级置信度传播译码算法。

A two stage belief-propagation(TSBP)decoding algorithm was developed based on trapping set state(TSS)detection to reduce the error floor of low-density parity-check(LDPC)codes.

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