**4.5. Advanced narrowband interference suppression schemes**

In [13] we have presented a new NBI-mitigation technique, which is shown in Fig. 9c). It is based on a soft limiter, where the soft limiter itself was originally proposed to suppress impulse interference [2]. The thresholds of the soft limiters are adjusted according to NBI power.

We have shown that the proposed receiver can effectively mitigate the NBI, if the threshold factor and the input level of the subsequent ADC are chosen appropriately. Furthermore, the performance improves if the ADC resolution is increased. In the presence of the OFDM interference, the proposed scheme could also be used, but it is required to adjust the threshold dynamically. It should be noted that the performance also depends on the frequency of the interference, since the DCMF has a frequency dependent transfer function.
