| 摘要 |
Differential decoding processing applied to multilevel modulation is accomplished with the circuit scale kept small by including: an MSB coordinate rotating part for performing coordinate rotation based on information of the first two most significant bits of a signal received via a synchronous detection part; an MSB symbol likelihood generating part for generating likelihood with respect to the first two most significant bits after differential decoding, with the use of two sets of bit strings at different points in time for which coordinate rotation has been performed; an LSB symbol likelihood generating part for generating likelihood with respect to less significant bits; and a soft decision error correction decoding part for generating a decoded signal with the use of the likelihood of the first two most significant bits and the likelihood of the less significant bits. |
