St-ericsson Sa

Nxp B.v.

Maurice Stassen

Ajay Kapoor

Jozef Reinerus Maria Bergervoet

Harish Kundur Subramaniyan

Interference detection involves detecting the interference component in the received signal if there is such a component, controlling a band reject filter according to the detected interference component to filter the received signal to suppress the interference component, and synchronizing the receiver to the received signal, wherein the step of detecting the interference component is started before synchronization is achieved. By starting the interference detection without waiting for synchronization to be achieved, rather than following the synchronization, then the interference detection is no longer dependent on the synchronization being achieved.

Synchronizing and detecting interference in wireless receiver

A wireless receiver for UWB or other format receives a useful signal in a particular band of frequencies in spite of interference components. The wireless receiver has two or more different types of tunable band reject filter, involves detecting interference in the received signal, and selecting which of the different types of filter to use according to thresholds of parameters of the detected interference. The filter is then tuned according to the detected interference and the useful signal is then received with the interference suppressed using the selected BRF. As the different types of filters have different drawbacks and benefits, by having multiple types, and selecting which to use according to the detected interference, the filtering can be better matched to the detected interference, or the drawbacks can be reduced for example.

Filtering interference detected at wireless receiver

A wireless receiver () for UWB or other format, receives a useful signal in a particular band of frequencies in site spite of interference components inside and outside the particular band of frequencies. An interference detector () detects the in band interference component in a first range of frequencies to include the particular band of frequencies. The same receiver circuitry () is adapted to receive a second range of frequencies to include frequencies adjacent to the particular band, to detect the out of band interference component. The position of a second interfering signal in the second range is used to detect artifacts caused by spectral folding so that the required frequency of a band reject filter can be found.

Detecting interference in wireless receiver

Data is received with a transceiver circuit with a receiver branch () that comprises a notch filter () and a digital Fourier transformer (). Furthermore the transceiver circuit has a transmitter branch () comprising an inverse digital Fourier transformer (). Prior to reception the transceiver circuit is switched to a calibration mode, wherein an output of the transmitter branch () is coupled to an input of the notch filter (). The inverse digital Fourier transformer () 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 () in the calibration mode. The digital Fourier transformer () is used to Fourier transform an output signal of the notch filter (). A control setting of the notch filter to suppress the frequency component from an output of the digital Fourier transformer () is determined. A parameter derived from said control setting is stored in a memory (). 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 ().

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Eindhoven, Netherlands

Maurice Stassen