| 摘要 |
A feed-forward dc-offset canceller, for use in direct conversion receiver (DCR) architecture wireless systems, in which dc-offset is estimated from the down-converted signal at the mixer output, and the offset is cancelled before applying the signal to the analog baseband section. A linear digital filter estimates and tracks the dc-offset, which is subtracted from the down-converted signal before the analog baseband input. The response of the filter can be adjusted by its coefficients according to different environments and standard requirements. Although higher order filters can be used depending on the requirements, preferably, a first order recursive filter is used as it has the advantages of being a very simple and efficient structure.
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