Automatic gain control in a communications system

摘要

An automatic gain control technique generates one or more gain control signals based on a known sequence of samples received in a preamble of a packet received over a particular communications link and generates one or more adjusted gain control signals based on a previously unknown sequence of samples received in a payload of a packet. In at least one embodiment of the gain control technique, time domain samples of the preamble of a symbol are used to generate the one or more gain control signals. In at least one embodiment of the gain control technique, frequency domain samples are used to generate the one or more adjusted gain control signals. The one or more gain control signals include digital and/or analog gain control signals that are provided to digital signal processing modules and/or analog circuits in an interface circuit, respectively, to adjust the gain applied to a received signal.

主权项

1. A method comprising:
receiving a payload portion of a received packet based on a gain control signal having a first value; and selectively adjusting the gain control signal to have a second value, the second value being based on the payload portion of the received packet, the selectively adjusting comprising:
generating an update indicator in response to a payload detection indicator based on the received packet and an error detection indicator based on decode of the payload portion of the received packet;generating the second value based on frequency domain samples of the payload portion of the received packet, the first value being based on time domain samples of a preamble portion of a second received packet; andadjusting the gain control signal to have the second value in response to the update indicator.