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Wireless LANs (for e.g., IEEE 802.11g) and Wireless Personal Access Networks (WPANs) operate in the same 2.4 GHz ISM frequency band. This paper considers the techniques to mitigate the interference caused by WPANs (e.g., Bluetooth) on the IEEE 802.11 wireless LAN. In particular, it considers the downlink where an adjacent Bluetooth device interferes with a WLAN station. It shows that a simple frequency diversity scheme makes the IEEE 802.11 WLAN robust to the narrow band interference caused by a Bluetooth device. It also proposes an interference cancellation algorithm which estimates the interference and reconstructs the WLAN signal (which is interference free).
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