Patent ID: 9350583
Filing Date: 2016-05-24
CPC Classification: H04L

Claim Text:
1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel, the method comprising: generating the data unit to include a first long training field when the data unit is to be transmitted in a normal mode, wherein the normal mode corresponds to a first channel bandwidth; and generating the data unit to include a second long training field when the data unit is to be transmitted in a low bandwidth mode, wherein the low bandwidth mode corresponds to a second channel bandwidth that is smaller than the first channel bandwidth, wherein the first long training field and the second long training field are configured to have a low cross-correlation value when cross-correlation is performed using at least some overlapping orthogonal frequency division multiplexing (OFDM) tones in the first long training field and the second long training field such that a receiving device can auto-detect whether the data unit corresponds to the low bandwidth mode or the normal mode.