OFDM TRANSMITTER, OFDM RECEIVER AND OFDM TRANSCEIVER

摘要

An OFDM transmitter, an OFDM receiver, and an OFDM transceiver are provided to improve reliability of data by repeatedly transforming important data in the transmitter and extracting a packet in the receiver based on a predetermined data importance. An OFDM transmitter comprises a symbol mapping unit(120), a diversity encoder(130), a multiplexer(140), and an IFFT unit(150). The symbol mapping unit performs mapping of bit data comprised in a bit data packet to a predetermined sub-carrier symbol for a unit having a predetermined bit number, and distinguishes a first packet and a second packet comprised in the symbol packet according to a predetermined data importance. The diversity encoder repeatedly assigns the distinguished first packet to a predetermined symbol restructuring packet at least two times according to a repetition assigning number. The multiplexer assigns the first packet to a non-assigned region of the symbol restructuring packet. The IFFT unit performs an IFFT of the symbol restructuring packet and converts the symbol restructuring packet in a frequency domain to the symbol restructuring packet in a time domain.