A method performed by a first Station (STA) for any one out of: transmitting Narrow Band (NB) signals to, and receiving NB signals from, second STAs in a Wireless Local Area Network (WLAN) is provided. The STA performs one or more out of: Transmitting (1001) the NB signals to the second STAs, and receiving (1002) the NB signals from the second STAs. The NB signal symbol boundaries are aligned in time with symbol boundaries of a Wide Band (WB) signal transmitted by any one out of the first STA and another STA. The NB signals start with a preamble comprising an NB-Short Training Field (STF) followed by a NB-Long Training Field (LTF). The NB LTF and NB STF are designed to avoid interference between the NB signals and WB signals.