Patent ID: 7418246

Claim:
A physical layer unit for a wireless Local Area Network (LAN) system, the physical layer unit comprising: an Analog-to-Digital (A/D) converter that receives and converts an OFDM analog signal or a DSSS/CCK analog signal processed by an RF module into a digital signal; and a receiving processor that: performs OFDM preamble processing of the received converted digital signal within a first predetermined time period; performs DSSS/CCK preamble processing of the received converted digital signal within a second predetermined time period; interpolates and demodulates the converted digital signal, outputs the interpolated and demodulated signal as a DSSS/CCK demodulation signal when the DSSS/CCK preamble processing is performed before the ODFM preamble processing; and directly demodulates the converted digital signal without interpolation, and outputs the demodulated signal as an OFDM demodulation signal when the OFDM preamble processing is performed before the DSSS/CCK preamble processing.