TRANSMISSION APPARATUS EMPLOYING ORTHOGONAL FREQUENCY DIVISION MULTIPLEX MODULATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an OFDM system transmission apparatus adopting a synchronization modulation system that eliminates the need for using a large scale circuit and is immune to an environmental change in a transmission system. SOLUTION: In the OFDM system transmission apparatus that uses carriers to transmit an information code and adopts a prescribed modulation system to each of carrier block divisions, by consecutively assigning at least one carrier block or more adopting the synchronization modulation system with different multi-value number of the synchronization modulation system or an error correction code correction capability used for the prescribed carrier block to both sides having a carrier block employing the modulation system adopting the synchronization detection in-between and by assigning a carrier block employing a multi-value number lower than that of the synchronization modulation system modulating carrier blocks inside the outermost carrier block or employing an error correction code with a higher correction capability to the outermost carrier block, a code error rate of the information code modulated and transmitted by the synchronization modulation system with a high multi-value number is improved considerably.