Convolutional code decoder and convolutional code decoding method

A convolutional code decoder which performs decoding, according to a received data and an auxiliary data, to obtain a target data, the convolutional code decoder comprising:

• a first error detection data generation circuit configured to perform an error detection operation on the auxiliary data to obtain an error detection data;
• a channel coding circuit coupled to the first error detection data generation circuit and configured to perform channel coding on the auxiliary data and the error detection data to obtain an intermediate data;
• a first selection circuit coupled to the channel coding circuit and configured to generate a first to-be-decoded data according to the received data and the intermediate data;
• a first Viterbi decoding circuit coupled to the first selection circuit and configured to decode the first to-be-decoded data to obtain an intermediate decoded data, wherein the intermediate decoded data comprises an estimated data and an intermediate error detection data;
• a second error detection data generation circuit coupled to the first Viterbi decoding circuit and configured to perform an error detection operation on the estimated data to obtain a reference error detection data;
• a comparison circuit coupled to the second error detection data generation circuit and the first Viterbi decoding circuit and configured to compare the intermediate error detection data and the reference error detection data;
• a second selection circuit coupled to the channel coding circuit, the second error detection data generation circuit, and the comparison circuit and configured to generate a second to-be-decoded data according to the received data, the intermediate data, and one of the intermediate error detection data and the reference error detection data;
• and
• a second Viterbi decoding circuit coupled to the second selection circuit and configured to decode the second to-be-decoded data to obtain the target data.