Apparatus and method for removing DC offset in a frequency direct-conversion device
First Claim
1. An apparatus for removing a DC offset during frequency direct conversion in a reception device of a wireless communication system, the apparatus comprising:
- a first adder for receiving a DC corrupted digital baseband signal, receiving an estimated DC offset value, and calculating a difference between the DC corrupted digital baseband signal and the estimated DC offset value; and
a DC offset calculator for receiving gain mode information of an analog element of the reception device, and calculating the estimated DC offset value according to the gain mode.
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Abstract
An apparatus for removing a DC offset during frequency direct conversion in a reception device of a wireless communication system. In the apparatus, an adder receives a digital baseband signal comprising a DC component, receives an estimated DC offset value, and calculates a difference between the digital baseband signal with the DC component and the estimated DC offset value. A DC offset calculator receives gain mode information of an analog element of the reception device, and calculates the estimated DC offset value according to the gain mode.
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Citations
16 Claims
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1. An apparatus for removing a DC offset during frequency direct conversion in a reception device of a wireless communication system, the apparatus comprising:
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a first adder for receiving a DC corrupted digital baseband signal, receiving an estimated DC offset value, and calculating a difference between the DC corrupted digital baseband signal and the estimated DC offset value; and
a DC offset calculator for receiving gain mode information of an analog element of the reception device, and calculating the estimated DC offset value according to the gain mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for removing a DC offset during frequency direct conversion in a reception device of a wireless communication system, the method comprising the steps of:
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selecting a gain mode depending on gain mode information of an analog element, and estimating a DC offset value according to the selected gain mode;
compensating for a loop gain and a filter gain from the estimated DC offset value; and
subtracting the gain compensated-DC offset value from a DC corrupted digital baseband signal. - View Dependent Claims (14, 15, 16)
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Specification