Apparatus and method for communicating data in hybrid diversity mode in broadband wireless communication system

An apparatus for receiving data in a wireless communication system, comprising:

• an orthogonal frequency division multiplexing (OFDM) demodulator for fast Fourier transform processing a received signal to generate frequency-domain data;
• a channel estimator for estimating the channel using the frequency-domain data from the OFDM demodulator;
• and
• a controller for determining, when the broadband wireless communication system operates in a hybrid diversity mode, null subbands with poor channel conditions using the channel estimation value from the channel estimator, and feeding information indicating the null subbands back to a transmitter.

A method for transmitting data to a subscriber station (SS) in a wireless communication system, comprising:

• determining null subbands using feedback information received from the SS;
• mapping TX data to be transmitted to the SS to a diversity zone from which the null subbands has been excluded;
• and
• modulating the mapped data and transmitting the OFDM-modulated data to the SS using orthogonal frequency division multiplexing (OFDM).

A method for receiving data in a wireless communication system, comprising the steps of:

• demodulating a received signal to generate frequency-domain data using orthogonal frequency division multiplexing (OFDM);
• estimating a channel using the frequency-domain data;
• determining null subbands with poor channel conditions using the channel estimation value if the broadband wireless communication system operates in a hybrid diversity mode;
• and
• feeding information indicating the null subbands back to a transmitter.

An apparatus for transmitting data in a wireless communication system, comprising:

• a controller for determining null subbands using feedback information received from a subscriber station (SS);
• a subchannel mapper for mapping TX data to be transmitted to the SS to a diversity zone from which the null subbands has been excluded;
• and
• a multicarrier modulator for processing the mapped data from the subchannel mapper.