Department of Computer Science and Information Systems
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Item Linear phase FIR filter for narrow-band filtering(IEEE, 2008) Gudino, Lucy J.This paper proposes a novel approach to the design of linear phase, sharp transition, lowpass FIR filter. The filter has narrow transition band, low passband ripple and good stopband attenuation with reduced arithmetic complexity. The frequency response model of the filter is formulated using trigonometric functions of frequency to reduce the ripples due to Gibbpsilas phenomenon and to evaluate the impulse response coefficients in closed form. FIR highpass and bandpass filters of any passband width can also be designed using the proposed approach.Item A novel design of sharp transition FIR filter for digital beamforming(IEEE, 2008) Gudino, Lucy J.This paper proposes a new approach to the design of linear phase, equiripple response, lowpass FIR filter for digital beamforming applications. The simple filter design without optimizations has sharp transition, good stopband attenuation with less filter complexity. An uniform linear array beamformer with a narrow transition bandwidth and low side lobes is synthesized with fewer sensor elements. This is achieved by using the proposed filters as subfilters in the frequency response masking approach. Precise and independent specification of main beamwidth and side lobe level for the beamformer is possible.Item A new filter design for uniform linear array(IEEE, 2008) Gudino, Lucy J.In this paper, a new design of spatial filter for uniform linear array is presented. The array factor is expressed in terms of cosine, sine and linear functions of frequency which serves as an alternative to Chebyshev polynomials. The simple filter design has good stopband attenuation with the use of trigonometric functions with less filter complexity. Novel slope equalization technique of the filter design reduces ripples at the transition edges hence further improves its stopband attenuation. Proposed filter replaces Dolph-Chebyshev window in the design of a uniform linear array beamformer.Item A novel filter design for spatially interpolated beamformer(IEEE, 2009) Gudino, Lucy J.This paper proposes a novel design approach for a linear phase lowpass FIR filter for digital beamformer applications. The simple filter design has good stopband attenuation with the use of trigonometric functions and less filter complexity. Novel slope equalization technique of the filter design reduces ripple at the transition edges of the filter hence further improves its stop band attenuation. Proposed filter replaces Dolph-Chebyshev window in the design of a uniform linear array spatially interpolated beamformer. The resulting beamformer yields narrow main beamwidth and low sidelobe level with reduced complexity. The beamformer provides for precise and independent control of main beamwidth, null to null main beamwidth and sidelobe level.Item Synthesis of Linear Phase Sharp Transition FIR Digital Filter(ECTI, 2005) Gudino, Lucy J.This paper proposes a new technique for synthesis of a sharp transition, equiripple passband, low arithmetic complexity, linear phase lowpass FIR filter. The frequency response of the filter with narrow transition width is modeled using trigonometric functions of frequency and its transfer function is evolved in frequency and time domain. The synthesized filter proves to be a good alternative to filters of the same class reported in the literature with added advantage of simplicity of design and ease of computation of the impulse response.