US 2004/0165564 A1 · Physical layer unit for transmitting or receiving various signals, wireless LAN system including the same, and wireless LAN method using the wireless LAN system

Abstract

A physical layer unit (PLU) for receiving (and transmitting) various signals, a wireless Local Area Network (LAN) system including the PLU, and a wireless LAN method using the wireless LAN system. The wireless LAN system is capable of receiving signals of different standards, by performing a first preamble processing of an input signal for a predetermined first time period of 16 μs (the preamble processing time period according to an OFDM standard for determining whether the input signal corresponds to the OFDM standard), and performing a second preamble processing within a predetermined second time period (the remainder of a preamble processing time period for determining whether the input signal corresponds to a DSSS/CCK standard), if the input signal does not correspond to the OFDM standard. Therefore, DSSS/CCK and OFDM signals can be transmitted and received reliably in the integrated wireless LAN system according to the IEEE 802.11.g standard.

Claims31

Dependent claims

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:
interpolates and demodulates the converted digital signal, outputs the interpolated and demodulated signal as a DSSS/CCK demodulation signal;
and
directly demodulates the converted digital signal without interpolation, and outputs the demodulated signal as an OFDM demodulation signal.

3 more elements

A physical layer unit for a wireless 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 demodulates the converted digital signal as an OFDM demodulation signal and outputs the OFDM demodulation signal according to a predetermined DSSS/CCK control in response to signal determination flag information in a first logic state;
and
that demodulates and outputs the converted digital signal as a DSSS/CCK demodulation signal according to a predetermined DSSS/CCK control in response to signal determination flag information in a second logic state.

2 more elements

A wireless LAN system comprising:

an RF module that receives an OFDM modulation signal or a DSSS/CCK modulation signal as an analog signal and outputs an OFDM analog signal or a DSSS/CCK analog signal;
a physical layer unit that receives and converts an analog signal output from the RF module into a digital signal, interpolates and demodulates the digital signal, outputs the interpolated and demodulated signal as a DSSS/CCK demodulation signal, and directly demodulates and outputs the digital signal as an OFDM demodulation signal.

A wireless LAN system comprising:

an RF module that receives an OFDM modulation signal or a DSSS/CCK modulation signal as an analog signal and outputs an OFDM analog signal or a DSSS/CCK analog signal;
a physical layer unit that
receives and converts an analog signal output from the RF module into a digital signal,
outputs the converted digital signal as an OFDM demodulation signal, according to a predetermined DSSS/CCK control, in response to signal determination flag information in a first logic state, the signal determination flag information being set by processing the converted digital signal, and
demodulates and outputs the converted digital signal as a DSSS/CCK demodulation signal, according to the predetermined DSSS/CCK control, in response to signal determination flag information in a second logic state;
and
a MAC layer unit that link-distributes the DSSS/CCK demodulation signal or the OFDM demodulation signal to other interfaced external layers.

4 more elements

Dependencies are inferred from the claim text.

Physical layer unit for transmitting or receiving various signals, wireless LAN system including the same, and wireless LAN method using the wireless LAN system

Life of this patent

Physical layer unit for transmitting or receiving various signals, wireless LAN system including the same, and wireless LAN method using the wireless LAN system

Life of this patent

Abstract

Claims31