ORTHOGONAL FREQUENCY DIVISION MULTIPLEX SIGNAL GENERATING METHOD, ORTHOGONAL FREQUENCY DIVISION MULTIPLEX SIGNAL GENERATOR, AND ITS DECODER

摘要

PROBLEM TO BE SOLVED: To solve the problem of a conventional orthogonal frequency division multiplex signal transmission method selecting a trellis coding rate depending on a communication state becoming large in the circuit scale of trellis coding circuits, corresponding to the conventional method because number of the coding circuits is required for number of coding rates. SOLUTION: An input circuit 41 adopts a data block, consisting of a multiple number with respect to number of numerators and a multiple number with respect to number of denominators for supplied data according to coding rates given as a plurality of fraction forms, after applying trellis coding with a desired coding rate and puncture coding are applied to the data block, the processed data block is modulated by a designated multi-value number to configure a coder with a small increase in the circuit scale, corresponding to a plurality of the coding rates.