Patent ID: 7839760

Claim:
A transmitting system of an orthogonal frequency division multiplexing (OFDM) wireless local area network (LAN), the transmitting system comprising: an OFDM modulation controller for controlling first OFDM modulation for an even-numbered time, and controlling second OFDM modulation by changing subcarrier allocation positions of first OFDM modulated symbols for an odd-numbered time; a frame generation controller for controlling generation of a frame having a plurality of signal fields generated according to the first OFDM modulation and the second OFDM modulation; a buffer unit for storing input data that are first OFDM modulated and second OFDM modulated according to a control operation of the OFDM modulation controller; and an OFDM modulation unit for repeatedly modulating the first and second OFDM modulated data stored in the buffer unit, forming the repeatedly modulated OFDM symbol as a frame according to a control operation of the frame generation controller, and transmitting the frame, wherein a bit allocation according to the first OFDM modulation is different from a bit allocation according to the second OFDM modulation.