Method for performing channel sounding in wireless LAN system and apparatus

摘要

The present invention relates to a method for performing channel sounding by means of an access point (AP) in a wireless LAN system. The method includes the steps of transmitting a null data packet announcement (NDPA) frame to notify that an NDP is to be transmitted, transmitting the NDP, and receiving a feedback frame from a station (STA). The NDP includes a signal field. The signal field of the NDP is transmitted through two orthogonal frequency division multiplexing (OFDM) symbols. One of the two OFDM symbols is a repeated OFDM symbol signifying that the other is repeated.

主权项

1. A method for transmitting data in a wireless local area network, the method comprising:
generating a physical layer protocol data unit (PPDU) for a 1 MHz bandwidth, the PPDU including a short training field (STF), a long training field (LTF), a signal field and a data field; and transmitting the PPDU over the 1 MHz bandwidth, wherein the signal field includes a plurality of first bit sequences that is transmitted through a plurality of first orthogonal frequency division multiplexing (OFDM) symbols, wherein each of the first bit sequences is repeated for a corresponding one of the plurality of first OFDM symbols, wherein the plurality of first bit sequences includes modulation and coding scheme (MCS) information used to modulate the data field, wherein an MCS index corresponding to an MCS level is used to indicate whether or not to apply OFDM symbol repetition, wherein, if the MCS information is set to a first MCS index, the data field is generated by a binary convolutional code (BCC) encoding with repetition, and wherein, if the MCS information is set to a second MCS index, the data field is generated by the BCC encoding with no repetition.