Method for transmitting and receiving signal in wireless local area network system and device for the same

A method performed by a first station (STA) for receiving a signal from a second STA through channel aggregation of a first channel and a second channel in a wireless local area network (WLAN) system, the method comprising:

• receiving a header field including 2*N (where N is a positive integer) pieces of modulation and coding scheme (MCS) information from the second STA;
• receiving spatial stream sequences in each channel through spatial streams in each corresponding channel from the second STA;
• obtaining output bit values of N low-density parity-check (LDPC) encoders corresponding to N pieces of MCS information among the 2*N pieces of MCS information from spatial stream sequences of each spatial stream in the first channel based on a mapping table defined by a relationship between the number of spatial streams in the first channel and the integer N;
• and
• obtaining output bit values of N LDPC encoders corresponding to remaining N pieces of MCS information among the 2*N pieces of MCS information from spatial stream sequences of each spatial stream in the second channel based on a mapping table defined by a relationship between the number of spatial streams in the second channel and the integer N.

A station (STA) device for transmitting a signal through channel aggregation of a first channel and a second channel in a wireless local area network (WLAN) system, the STA device comprising:

• a transceiver configured to transmit and receive signals to and from a different STA device with at least one radio frequency (RF) chain;
• and
• a processor configured to be connected to the transceiver and process the signals transmitted and received to and from the different STA device,
• wherein the processor is configured to:
• transmit a header field including 2*N (where N is a positive integer) pieces of modulation and coding scheme (MCS) information to the different STA;
• map output bit values of N low-density parity-check (LDPC) encoders corresponding to N pieces of MCS information among the 2*N pieces of MCS information to spatial stream sequences of each spatial stream in the first channel based on a mapping table defined by a relationship between the number of spatial streams in the first channel and the integer N;
• map output bit values of N LDPC encoders corresponding to remaining N pieces of MCS information among the 2*N pieces of MCS information to spatial stream sequences of each spatial stream in the second channel based on a mapping table defined by a relationship between the number of spatial streams in the second channel and the integer N;
• and
• transmit the mapped spatial stream sequences through spatial streams in each corresponding channel to the different STA.

A station (STA) device for receiving a signal through channel aggregation of a first channel and a second channel in a wireless local area network (WLAN) system, the STA device comprising:

• a transceiver configured to transmit and receive signals to and from a different STA device with at least one radio frequency (RF) chain;
• and
• a processor configured to be connected to the transceiver and process the signals transmitted and received to and from the different STA device,
• wherein the processor is configured to:
• receive a header field including 2*N (where N is a positive integer) pieces of modulation and coding scheme (MCS) information from the different STA;
• receive spatial stream sequences in each channel through spatial streams in each corresponding channel from the different STA;
• obtain output bit values of N low-density parity-check (LDPC) encoders corresponding to N pieces of MCS information among the 2*N pieces of MCS information from spatial stream sequences of each spatial stream in the first channel based on a mapping table defined by a relationship between the number of spatial streams in the first channel and the integer N;
• and
• obtain output bit values of N LDPC encoders corresponding to remaining N pieces of MCS information among the 2*N pieces of MCS information from spatial stream sequences of each spatial stream in the second channel based on a mapping table defined by a relationship between the number of spatial streams in the second channel and the integer N.