Dual carrier modulator for modulating OFDM multi-carrier, OFDM transmitter therewith, and a method thereof

An orthogonal frequency division multiplexing (OFDM) transmitter comprising:

• a coder which codes a predetermined data stream and outputs a predetermined number of coded bits;
• a dual carrier modulator which detects four bits among the coded bits in a predetermined order and generates a modulated symbol comprising a real part and an imaginary part, using the four detected bits and a predetermined unitary matrix;
• and
• a fast Fourier transformer (FFT) which fast-Fourier-transforms and outputs the modulated symbol.

A dual carrier modulation method, comprising:

• receiving a predetermined number of coded bits;
• detecting four bits among the coded bits in a predetermined order;
• and
• generating a modulated symbol comprising a real part and an imaginary part, using the four detected bits and a predetermined unitary matrix.

A method for transmitting orthogonal frequency division multiplexing (OFDM) symbols in an OFDM transmitter, comprising:

• generating a predetermined number of coded bits by coding a predetermined data stream;
• detecting four bits among the coded bits in a predetermined order;
• generating a modulated symbol comprising a real part and an imaginary part, using the four detected bits and a predetermined unitary matrix;
• and
• fast-Fourier-transforming the modulated symbol and outputting the transformed modulated symbol.