| 摘要 |
The present invention realizes a high coding gain employing a non-linear coding and a non-linear mapping. A converter converts one row of data that is inputted from a terminal into plural rows of data. The non-linear encoders non-linearly encode-lower level two rows of data in plural rows of converted data, and outputs them as data of level 1 and level 2 to a non-linear mapping circuit. The non-linear mapping circuit maps the data non-linearly encoded by the non-linear encoders and the uncoded data so that each codeword distance may be optimal. A modulator modulates a carrier wave with two-dimensional data that are mapped by the non-linear mapping circuit.
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