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For a WLAN antenna, if the signal strength is increased, can I expect higher SNR, lower bit error rate(BER) and higher data speed?

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The access point and client (station) will negotiate a channel coding (MCS) based on each other’s received signal strength. So boosting the power at the AP might let the partners bump up to a faster rate, but only if the AP can also see a strong enough signal from the client to do that.

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