Transmitting apparatus, receiving apparatus, and controlling method thereof

A receiving apparatus comprising:

• a receiver configured to receive a signal comprising a preamble symbol and a data symbol;
• a symbol synchronization unit configured to detect the preamble symbol of the received signal, synchronize the preamble symbol and compensate for a frequency offset;
• a channel estimator configured to detect a reference signal included in the preamble symbol and perform channel estimation using the reference signal;
• an integer frequency offset (IFO) compensator configured to compensate for an IFO using the reference signal;
• and
• a decoder configured to detect signaling data included in the preamble symbol and decode the signaling data.

A controlling method of a transmitting apparatus, the method comprising:

• generating a preamble symbol comprising signaling data and a reference signal;
• allocating first subcarriers and second subcarriers to the signaling data and the reference signal, respectively, in a frequency range corresponding to the preamble symbol;
• mapping the signaling data and the reference signal to the allocated first and second subcarriers;
• and
• transmitting a signal comprising the preamble symbol and a data symbol,
• wherein the reference signal is a signal used for channel estimation or frequency offset compensation.

A controlling method of a receiving apparatus, the method comprising:

• receiving a signal comprising a preamble symbol and a data symbol;
• detecting the preamble symbol of the received signal, synchronizing the preamble symbol and compensating for a frequency offset;
• detecting a reference signal included in the preamble symbol and performing channel estimation using the reference signal;
• compensating for an integer frequency offset (IFO) using the reference signal;
• and
• detecting signaling data included in the preamble symbol and decoding the signaling data.