Invention Grant
US08781042B1 Systems and methods for calibrating digital baseband DC offset in an OFDM receiver 有权
用于在OFDM接收机中校准数字基带DC偏移的系统和方法

Systems and methods for calibrating digital baseband DC offset in an OFDM receiver
Abstract:
In accordance with the teachings described herein, systems and methods are provided for calibrating DC offset in a receiver. A DC calibration circuit may be used that is configured to receive a digital multi-carrier modulated (MCM) signal that includes a sequence of MCM symbols. The DC calibration circuit may include an accumulator and a compensator. The accumulator may be used to determine an estimated DC offset of a current MCM symbol in the sequence of MCM symbols. The compensator may be used to remove the estimated DC offset from a next MCM symbol in the sequence of MCM symbols. The accumulator may also be used to receive a plurality of digital samples that comprise the current MCM symbol and to determine the estimated DC offset by calculating an average of the plurality of digital samples.
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