| 摘要 |
A communication system receives a signal that is coded using a repetition encoder (2) in a transmitter side, thereafter extended-mapped by an extended mapper (5), and transmitted by a transmitter (6). A demapper (12) demaps the received signal, corresponding to the extended mapping. The decoding unit (15) decodes a result of the demapping, corresponding to the coding using the repetition code. Mutual information between the transmitter coded bits and the log likelihood ratios of the demapping and decoding results is increased by exchanging the likelihood ratio between the demapper (12) and the decoder (15).
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