Patent ID: 8675789

Claim:
A receiver comprising: one or more variable gain elements comprising a low noise amplifier; an automatic gain control (AGC) for controlling a gain of one or more of the one or more variable gain elements; and a synchroniser configured to detect the presence of a frame in a signal received by the receiver and to output another signal to the AGC on detection of the frame, wherein the AGC is configured to estimate a signal to noise ratio (SNR) of the received signal on receiving said another signal from the synchroniser, to calculate a SNR margin between the estimated SNR and a target SNR and to adjust the gain of one or more of the one or more variable gain elements to maintain a positive SNR margin such that in the event of interference with the received signal the one or more variable gain elements do not saturate, and wherein the receiver is configured to adjust the gain and then enter a locked state upon the detection of the frame in the received signal by the synchroniser.