Modified CIC filter for sample rate conversion in software radio systems

Abu-Al-Saud, Wajih; Stuber, G.L.

doi:10.1109/lsp.2003.810023

Cited by 41 publications

(16 citation statements)

References 5 publications

(8 reference statements)

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“…They can be used in software defined radio systems [2] - [3], FPGA design [4], sigma-delta analog-to-digital converters [5] - [6], [19] - [22], etc.…”

Section: B Selection Of the Design Parametersmentioning

confidence: 99%

“…A CIC finite impulse response (FIR) filter that uses only additions/subtractions can be used to reduce the computational demands. Many papers have addressed the problem of some modifications of the classical CIC filters for sample rate conversion in software defined radio systems [2]- [4]. A number of demonstrated characteristics make the structures proposed in [2]- [3] a good candidate for software defined radio applications.…”

Section: Introductionmentioning

confidence: 99%

“…Many papers have addressed the problem of some modifications of the classical CIC filters for sample rate conversion in software defined radio systems [2]- [4]. A number of demonstrated characteristics make the structures proposed in [2]- [3] a good candidate for software defined radio applications. Modified CIC filters are ideal for applications in which high sampling rates make the use of multipliers a computationally expensive option.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A class of selective CIC FIR filter functions

Pavlović¹,

Milić²,

Stosic³

2015

Telfor

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“…They can be used in software defined radio systems [2] - [3], FPGA design [4], sigma-delta analog-to-digital converters [5] - [6], [19] - [22], etc.…”

Section: B Selection Of the Design Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A class of selective CIC FIR filter functions

Pavlović¹,

Milić²,

Stosic³

2015

Telfor

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“…Phase modulation and PSK can be regarded as a special case of QAM, where the magnitude of the modulating signal is a constant, with only the phase varying. This can also be extended to FM and frequency-shift keying (FSK), for these can be regarded as a special case of phase modulation (Xiaoyi et al 1999;Abu-Al-Saud and Stuber 2003).…”

Section: Implementation Of Quadrature Amplitude Modulationmentioning

confidence: 99%

Performance comparison of quadrature amplitude modulation (QAM)-based single- and double-stage digital interpolators

Ratan

Sharma

Kohli

2013

International Journal of Electronics

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In this article, the performance of quadrature amplitude modulation (QAM)-based single-and double-stage digital interpolators have been compared. The basic interpolator for up-sampling can be a combination of an expander unit with an interpolation lowpass filter in cascade. Complicated implementations can be done by connecting multiple expander and low-pass filter pairs in cascade. This article presents the efficient and effective implementation of digital interpolation systems for up-sampling of single-and double-stage digital interpolators. Comparison is done in terms of spectrum of generated signal, envelope power, modulated signal trajectory, input and output constellation and noise performance. In this article, the proposed interpolation filters have been simulated in Agilent's Advanced Design System (ADS).

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“…There are two major drawbacks of the conventional filters which are the large passband droop and limited stopband attenuation. These problems can be corrected to a certain extend by either modifying the conventional CIC structure, [2], [3], [4], [5], [6] or by cascading of a secondary filter, after the conventional one, to compensate its undesired characteristics, [7], [8]. A second order and fourth order maximally flat CIC passband compensator filter is designed in [9] which can be cascaded with CIC structure.…”

Section: Introductionmentioning

confidence: 99%

FPGA implementation of an efficient cascaded integrator comb filter for narrow and wideband designs

Shaji

Jayaraj

2013

2013 International Conference on Control Communication and Computing (ICCC)

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Cascaded integrator-comb (CIC) digital filters are computationally efficient implementations of low pass filters. A characteristic that makes them popular in hardware devices is that they require no multiplication. For an ideal low pass filter, the passband part of the signal spectrum is multiplied by one and the stopband part of the signal by zero. The CIC filter has a poor magnitude response, that is, a high passband droop and a low attenuation in the folding bands. Thus the implementation of CIC filters should aim to provide better attenuation in the stopbands and reduced droop in the passbands. CIC filters are typically either followed or preceded by higher performance linear-phase low pass tapped delay-line FIR filters whose tasks are to compensate for the CIC filter's non-flat passband. This paper introduces a design and implementation of cascaded integrator comb with maximally flat passband using second order linear phase filter for narrowband compensation and fourth order linear phase filter for wideband compensation without using a separate compensator. Closed-form equations for the computation of the filter coefficients are provided. Here response sharpening with a Chebyshev polynomial is carried out to get an equiripple stopband. Computational complexity is reduced with the use of low-speed additions, and multiplications by small integer coefficients are converted to shift operations with powers of two. The many small stopbands of CIC are replaced with one large one. The optimized design uses a single Saram ki Ritoniemi structure to provide passband flatness and stopband sharpening simultaneously, making it suitable for FPGA implementation. Thus it can be effective in 1D receiver antenna array designs to create pencil beams.

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Modified CIC filter for sample rate conversion in software radio systems

Cited by 41 publications

References 5 publications

A class of selective CIC FIR filter functions

A class of selective CIC FIR filter functions

Performance comparison of quadrature amplitude modulation (QAM)-based single- and double-stage digital interpolators

FPGA implementation of an efficient cascaded integrator comb filter for narrow and wideband designs

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