Transmitter and receiver of signals through polarization antenna and methods for controlling the same

A receiver, comprising:

• a polarization antenna configured to receive a plurality of signals each including a first data subcarrier which is not frequency-shifted and a frequency-shifted second data subcarrier;
• a selector configured to demultiplex a second data subcarrier, and a second training sequence or a second pilot subcarrier included in a signal including the frequency-shifted second data subcarrier among the plurality of received signals;
• a frequency shift unit configured to frequency-shift the demultiplexed second data subcarrier based on a predetermined frequency, to transform the demultiplexed second data subcarrier to an original second data subcarrier before being frequency-shifted;
• and
• a demodulator configured to demodulate the signal including the first data subcarrier, which is not frequency-shifted, received through the polarization antenna, the demultiplexed second training sequence or second pilot subcarrier, and the transformed original second data subcarrier.

A method for controlling a transmitter, the method comprising:

• generating a first signal including a first data subcarrier and a first training sequence or a first pilot subcarrier which need not be frequency-shifted, and a second signal including a second data subcarrier which needs to be frequency-shifted and a second training sequence or a second pilot subcarrier which need not be frequency-shifted, through a modulator;
• demultiplexing the second data subcarrier, and the second training sequence or the second pilot subcarrier which need to be frequency-shifted, which are included in the second signal, through a demultiplexer;
• frequency-shifting the demultiplexed second data subcarrier based on a predetermined frequency, through a frequency shift unit;
• generating a polarization signal by superimposing the demultiplexed second training sequence or second pilot subcarrier and the frequency-shifted second data subcarrier, through a superposition unit;
• and
• transmitting each of the first signal which need not be frequency-shifted and the generated polarization signal, through a polarization antenna.

A method for controlling a receiver, the method comprising:

• receiving a plurality of signals each including a first data subcarrier which is not frequency-shifted and a frequency-shifted second data subcarrier, through a polarization antenna;
• demultiplexing a second data subcarrier, and a first training sequence or a second pilot subcarrier which are included in a signal including the frequency-shifted second data subcarrier among the plurality of received signals, through a selector;
• frequency-shifting the demultiplexed second data subcarrier based on a predetermined frequency, to transform the demultiplexed second data subcarrier to an original second data subcarrier, through a frequency shift unit;
• and
• demodulating the signal including the first data subcarrier which is not frequency-shifted, received through the polarization antenna, and the first training sequence or the first pilot subcarrier, the demultiplexed second training sequence or second pilot subcarrier, and the transformed original second data subcarrier, through a demodulator.