DIGITAL WIRELESS COMMUNICATION METHOD, TRANSMITTER AND RECEIVER USING MULTILEVEL MODULATION SCHEME

摘要

A transmitter (1) for use in digital radio communications systems includes: a bit corrector (14) controls bit arrangement in such a manner that a code having high significance, out of multiple codes obtained by coding, is allocated with high priority to a bit having a tendency that the likelihood enlarges at the time of symbol decision on a receiver (2) ; a multi-level modulator (15) allocates the code to the multiple bits in accordance with a predetermined symbol arrangement; and a symbol arrangement controller (18) controls the symbol arrangement from equal distance arrangement to another arrangement in accordance with a ratio of the codes different in significance. To control symbol arrangement increases the effect of bit correction and improves an error rate on the receiver (2) .