Coexistence between primary chains and auxiliary receiver chain in a WLAN device

A method, comprising:

• in a Wireless Local Area Network (WLAN) device, which includes (i) at least one antenna, (ii) one or more primary transmission/reception (TX/RX) chains and (iii) an auxiliary reception (RX) chain that shares a common antenna and a common Low-Noise Amplifier (LNA) with a primary TX/RX chain designated from among the primary TX/RX chains, defining a first operational mode in which priority is given to transmission of the primary TX/RX chains, and a second operational mode in which the priority is given to reception of the auxiliary RX chain;
• and
• while operating the WLAN device alternately in the first and second operational modes:
• tuning the primary TX/RX chains to a given communication channel having a first channel frequency;
• and
• tuning the auxiliary RX chain to one or more alternative communication channels having second channel frequencies that are different from the first channel frequency
• setting a gain of the common LNA, by:
• checking whether signals are received in both the auxiliary RX chain and the primary TX/RX chain, or whether a signal is received in only one of the auxiliary RX chain and the primary TX/RX chain;
• when the signals are received in both the auxiliary RX chain and the primary TX/RX chain, setting the gain of the common LNA either based on a first signal received via the common LNA by the primary TX/RX chain on the given communication channel, or based on a second signal received via the common LNA by the auxiliary RX chain on the one or more alternative communication channels;
• otherwise, when the signal is received only in the auxiliary RX chain and not in the primary TX/RX chain, setting the gain of the common LNA based on the signal received in the auxiliary RX chain;
• and
• otherwise, when the signal is received only in the primary TX/RX chain and not in the auxiliary RX chain, setting the gain of the common LNA based on the signal received in the primary TX/RX chain;
• and
• after setting the gain of the common LNA, communicating via the common LNA on the given communication channel using the one or more primary TX/RX chains, and concurrently evaluating signal activity via the common LNA and the common antenna on the one or more alternative communication channels using the auxiliary RX chain.