Patent ID: 7688926

Claim:
A transmission apparatus in a frequency overlay communication system using a first frequency band and a second frequency band, the apparatus comprising: a preamble channel generator for generating a preamble channel signal; a pilot channel generator for generating a pilot channel signal; a traffic channel generator for generating a traffic channel signal; a control channel generator for generating a control channel signal; a scheduler for, upon generation of data to be transmitted, scheduling the data and allocating a frequency band over which the data is to be transmitted according to the second frequency band; a multiplexer for generating a downlink channel signal by multiplexing the preamble channel signal, the pilot channel signal, the traffic channel signal, and the control channel signal according to information on the allocated frequency band; and an inverse fast Fourier transform (IFFT) unit for performing IFFT on the downlink channel signal, wherein the second frequency band includes the first frequency band and a third frequency band that is dependent on the second frequency band, wherein the preamble channel signal includes a first preamble channel signal transmitted over the first frequency band, and a second preamble channel signal transmitted over the third frequency band, wherein the pilot channel signal includes a first pilot channel signal transmitted over the first frequency band, and a second pilot channel signal transmitted over the third frequency band, wherein the traffic channel signal includes a first traffic channel signal transmitted over the first frequency band, and a second traffic channel signal transmitted over the third frequency band, and wherein the control channel signal includes a first control channel signal transmitted over the first frequency band, and a second control channel signal transmitted over the third frequency band.