Patent ID: 8254480
Filing Date: 2012-08-28
Classification: H03G,H04B,H04L

Abstract:
1. A method for performing automatic gain control during a signal processing of OFDM symbols in a received signal at an RF receiver, the OFDM symbols arriving at the RF receiver in different frequency subbands according to a pattern indicated by a time-frequency code (TFC) for frequency subband hopping, the RF receiver having a first gain, a second gain, and a third gain operating in series on the OFDM symbols, the third gain including parallel gains, a number of the parallel gains being equal to a number of the different frequency subbands, each parallel gain corresponding to one of the frequency subbands, each parallel gain having a gain corresponding to a gain index, the method comprising: initializing the first gain, the second gain, and the parallel gains of the third gain to a highest value for each; amplifying the OFDM symbols in all of the frequency subbands by the first gain and the second gain, amplifying the OFDM symbols in each of the frequency subbands by the corresponding parallel gain; adjusting the first gain and the second gain by values corresponding to the first-second gain combination; changing the gain index if a first number of digitized output and a second number of digitized output exceed or fall below predetermined limits; and adjusting the third gain by adjusting each of the component gains to values corresponding to the changed gain index.