Direct current (DC) compensating method, DC compensator and baseband signal processor

Abstract

The embodiments of the present invention relate to a method for direct current compensation, a direct current compensator and a baseband signal processor. Acquiring the average value of sampling points of polluted signals in the present estimation period; acquiring a rounding-up / rounding-down proportion of the decimal places according to the decimal places of the average value; rounding up or rounding down the decimal places of the average value according to the rounding-up / rounding-down proportion, to obtain an estimated value of the direct current; and carrying out a direct current compensation for polluted signals in the target estimation period by using the estimated value of the direct current. By using the method for direct current compensation, the direct current compensator and the baseband signal processor provided by the embodiments of the present invention, the accuracy of direct current compensation can be improved.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a DC compensation method, a DC compensator and a baseband signal processor. Background technique [0002] In VLSI (Very Large Scale Integrated circuits, VLSI), there are devices that introduce direct current (Direct Current, DC) components in both radio frequency devices and analog devices, so it is necessary to perform DC compensation on the output signals of the above devices. [0003] With the development of VLSI technology, DC compensation is now performed in the digital domain. A signal before DC compensation contains a DC component and is called a polluted signal. The specific method of DC compensation for the polluted signal is: set an estimation period, count the mean value of all samples in this estimation period in the polluted signal, round it up as the DC estimation value, and in the next estimation period, each sample The polluted signal at ea...

AI Technical Summary

Problems solved by technology

[0004] With the existing DC compensation method, since the accuracy of the digital domain of the DC compensation value is limited by the bit width of the digital domain, it is impossible to accurately estimate the DC value to decimal places, so the mean value obtained by statistics must be rounded, and the data with decimal places must be discarded , the rounded value is used as the estimated value of DC, resulting in the residual DC component of the signal after DC compensation, so the accuracy of DC compensation is low, and the residual DC component has an adverse effect on the subsequent time domain algorithm, which damages VLSI performance

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