Automatic gain control method and apparatus for wireless communication systems
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United States of America Patent
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Mar 19, 2013
Grant Date -
Dec 22, 2011
app pub date -
Aug 29, 2011
filing date -
Nov 30, 2006
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Abstract
A system and method are provided for automatic gain control (AGC) using an adaptive reference and a threshold. An adaptive reference allows for adjusting the target power based on variations in operating parameters and conditions, such as a change to a modulation schemes which requires a different signal to noise ratio (SNR) to maintain performance. A gain adjustment threshold allows for rapid AGC response while reducing the potential effects of hysterisis. AGC levels may be changed during symbol prefixes or suffixes, and avoided during a data portion of a signal. Embodiments allow for symbol-by symbol AGC changes in OFDM, OFDMA, and TDD systems.
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