Apparatus and method for transmitting data using a plurality of carriers

A method for a transmitter to transmit a signal, the method comprising:

• generating a first modulation symbol vector for first type information;
• multiplying only each element of a second modulation symbol vector for a pilot by a common single modulation symbol generated from second type information, so as to provide a third modulation symbol vector for both the pilot and the second type information, wherein the common single modulation symbol is mapped to one of four constellation points according to the second type information, and each element of the third modulation symbol vector is mapped to one of four phase shifted constellation points;
• and
• mapping the first modulation symbol vector for the first type information to a frequency band including a plurality of orthogonal subcarriers, and mapping the third modulation symbol vector for both the pilot and the second type information to the frequency band including a plurality of orthogonal subcarriers.

A transmitter for transmitting a signal, the transmitter comprising:

• a first module adapted to generating a first modulation symbol vector for first type information;
• a second module adapted to multiply only each element of a second modulation symbol vector for a pilot by a common single modulation symbol generated from second type information, so as to provide a third symbol vector for both the pilot and the second type information, wherein the common single modulation symbol is mapped to one of four constellation points according to the second type information, and each element of the third modulation symbol vector is mapped to one of four phase shifted constellation points;
• and
• a third module adapted to transmit the first symbol vector for the first type information and to transmit the third symbol vector for both the pilot and the second type information.