FAST AUTOMATIC GAIN CONTROL (AGC) FOR PACKET BASED SYSTEMS

摘要

A method and apparatus for use in a packet based wireless communication system for reducing automatic gain control (AGC) convergence time at a receiver are described. A radio frequency (RF) signal is received. The RF signal includes a sequence of a plurality of pre-defined power levels at a beginning of a preamble of the RF signal. Statistics for each of the plurality of pre-defined power levels at the beginning of the preamble of the RF signal are computed. An appropriate gain for a variable gain amplifier (VGA) is then computed based on the computed statistics for each of the plurality of pre-defined power levels and a-priori information related to transmission power differences between the plurality of pre-defined power levels of the sequence.

主权项

1. A method for use in a packet-based wireless communication system for reducing automatic gain control (AGC) convergence time at a receiver, the method comprising:
receiving a radio frequency (RF) signal including a preamble portion and a data portion; applying a pre-defined sequence of gain levels at a variable gain amplifier (VGA) to the preamble portion of the RF signal; computing statistics when each of the pre-defined sequence of gain levels is applied to the preamble portion of the RF signal; and computing an appropriate gain for the VGA based on the computed statistics when each of the pre-defined sequence of gain levels is applied to the preamble portion of the RF signal.