Abstract: Embodiments of the present invention may provide an apparatus and a method for transmitting an orthogonal frequency division multiplexing access (OFDMA) symbol in an OFDMA system. A bandwidth limit parameter for generating an OFDMA symbol may be adaptively determined based on the received signal quality of a receiver. An OFDMA symbol may be generated based on the bandwidth limit parameter and transmitted to the receiver. According to embodiments, when the received signal quality of the receiver is bad, the bandwidth limit parameter may be first adjusted before the modulation scheme is changed to have a lower data rate. In such a case, the downlink date rate may be maintained with enhancing the received signal quality of the receiver.

Abstract: Embodiments of the present invention may provide an apparatus and a method for transmitting an orthogonal frequency division multiplexing access (OFDMA) symbol in an OFDMA system. A bandwidth limit parameter for generating an OFDMA symbol may be adaptively determined based on the received signal quality of a receiver. An OFDMA symbol may be generated based on the bandwidth limit parameter and transmitted to the receiver. According to embodiments, when the received signal quality of the receiver is bad, the bandwidth limit parameter may be first adjusted before the modulation scheme is changed to have a lower data rate. In such a case, the downlink date rate may be maintained with enhancing the received signal quality of the receiver.