Automatic gain control for frequency-hopped OFDM

Details Automatic gain control for frequency-hopped OFDM Automatic gain control for frequency-hopped OFDM

2011-03-29

2011-03-29

Wang, Ted M (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S316000, C375S324000, C375S340000, C375S345000

Reexamination Certificate

active

07916798

ABSTRACT:
An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.

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