AGC Algorithm for IEEE 802.11a Based on Correlator and Threshold Detector

Analog to digital converters (ADC) are utilized broadly in signal processing systems for converting analog signals into digital signals. However, in the progress of ADC, if the received signal power exceeds the operation range of receiver, the system performance is degraded drastically. In this paper, we propose an Automatic Gain Control (AGC) design scheme for IEEE 802.11a based on the correlator and threshold detector. The proposed scheme estimates the received signal power using the correlation value with the Short Training Sequence (STS) of preamble and transmits these parameters to the AGC for gain control of receiver. In addition, if the high power received signal that exceeds the operating range of ADC is received, proposed scheme can control the correlation output using the threshold detector and feedback loop. The proposed scheme has the large operating range more than 60 dB and can be performed by two short training sequences.