Abstract: The present invention provides a method for receiving WIFI signals. The method includes using a wireless local area network path to transmit digital signals generated by a digital user device to an access point of a receiver. These signals include those from the bandwidth of certain user devices; and filters to change the position of the center frequencies of these user devices so that these signals combine the I and Q path ??ADC into a single composite ??ADC at a smaller sub-channel bandwidth, and select proper location of this center frequency and reduce its clock rate.

Abstract: An automatic gain control circuit for controlling an LNA for inputting signals carrying packets, the automatic gain control circuit can perform a background calibration in the non-preamble time region of a first packet for pre-determining a gain adjustment to the LNA before the next preamble of a second packet arrives, so that the gain of the LNA can be adjusted immediately according to the pre-determined gain adjustment when the next preamble of the second packet arrives.

Abstract: An automatic gain control circuit for controlling an LNA for inputting signals carrying packets, the automatic gain control circuit can perform a background calibration in the non-preamble time region of a first packet for pre-determining a gain adjustment to the LNA before the next preamble of a second packet arrives, so that the gain of the LNA can be adjusted immediately according to the pre-determined gain adjustment when the next preamble of the second packet arrives.