Patent ID: 9219458
Filing Date: 2015-12-22
Classification: H03G

Abstract:
1. A method for DC calibration in a wireless communication system, comprising: setting an analog gain of a signal received over a communications link within a predetermined Receive/Transmit Transition gap (RTG) during normal traffic exchange over the communications link and before a downlink (DL) subframe of the received signal is received by a user equipment (UE) from a base station, wherein setting the analog gain to vary according to each different downlink zone within an orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) frame; amplifying a portion of the received signal using an analog gain setting for a downlink zone in the OFDM or OFDMA frame during the portion of the received signal based on the downlink zone; estimating a downlink zone DC offset of the amplified portion of the received signal within the predetermined RTG during the normal traffic exchange over the communications link and before the downlink (DL) subframe of the received signal is received by the user equipment (UE) from the base station; and updating a DC offset by applying the estimated downlink zone DC offset to the amplified portion of the received signal within the predetermined Receive/Transmit Transition gap before the downlink subframe of the OFDM or OFDMA frame.