Multi-carrier signal transmitter and multi-carrier signal receiver

1. A multi-carrier signal transmission apparatus for transmitting a transmission stream including at least preamble information necessary for synchronizing a transmission signal and data information as a multi-carrier signal, the apparatus comprising:

a modulator that generates a transmission symbol stream by modulating an arrangement of the preamble information and the data information; and

a symbol expanding portion that expands the transmission symbol stream on a frequency axis by generating a complex conjugate value of at least one part of the preamble information symmetrically on the frequency axis.

2. The multi-carrier signal transmission apparatus according to claim 1 , wherein the transmission symbol stream is expanded symmetrically about a reference position on the frequency axis.

3. A multi-carrier signal transmission apparatus for transmitting a transmission stream including at least preamble information necessary for synchronizing a transmission signal and data information as a multi-carrier signal, the apparatus comprising:

modulation means for generating a transmission symbol stream by modulating an arrangement of the preamble information and the data; and

transmission symbol stream expanding means for expanding the transmission symbol stream on a frequency axis by generating a complex conjugate value of at least one part of the preamble information symmetrically on the frequency axis.

4. The multi-carrier signal transmission apparatus according to claim 3 , wherein the transmission symbol stream is expanded symmetrically about a reference position on the frequency axis.