Wide band transceiver and data receiving method using a tunable notch filter and pre-estimated optimal notch filter parameters

摘要

Data is received with a transceiver circuit with a receiver branch (14) that comprises a notch filter (140) and a digital Fourier transformer (146). Furthermore the transceiver circuit has a transmitter branch (16) comprising an inverse digital Fourier transformer (160). Prior to reception the transceiver circuit is switched to a calibration mode, wherein an output of the transmitter branch (16) is coupled to an input of the notch filter (140). The inverse digital Fourier transformer (160) of the transmitter is used to compute an inverse transform of a spectrum with a frequency component at a selected position. A signal derived from the inverse transform is applied to an input of the notch filter (140) in the calibration mode. The digital Fourier transformer (146) is used to Fourier transform an output signal of the notch filter (140). A control setting of the notch filter to suppress the frequency component from an output of the digital Fourier transformer (146) is determined. A parameter derived from said control setting is stored in a memory (149a). After the transceiver circuit is switched to a reception mode, a received interfering signal and an interference frequency of the received interfering signal are detected. The stored parameter to translate the detected interference frequency into a control setting of the notch filter (140).