Software defined radios typically employ digital filter banks (FBs) for channelisation. Frequency response masking (FRM) approach is used to reduce the computational complexity of the complex modulated FB with narrow transition band. A unified FRM-based complex modulated FB structure is proposed to design sharp filters with arbitrary passband bandwidth. The proposed unified FRM-based complex modulated FB structure with low complexity is suitable for different even-stacked or odd-stacked, maximally decimated or non-maximally decimated structures. It also can be directly applied to high sampling rate systems. It is shown that the proposed unified FRM-based complex modulated FB structure can obtain the improvement of the computational complexity compared with the other methods.
Moving target indication (MTI) is an effective means for radar to find moving targets in clutter environment. This paper introduces the basic principles of MTI, how to avoid the blind speed problem and the optimization of MTI filter. Implementing the multi-notch adaptive moving target indication (AMTI) filter that designed by using the stagger code in varied cases, which is based on a feature vector method optimization.
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