| 1. |
- Blad, Anton, 1981-, et al.
(författare)
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A General Formulation of Analog-to-Digital Converters Using Parallel Sigma-Delta Modulators and Modulation Sequences
- 2006
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Ingår i: Asia Pacific Conference on Circuits and Systems,2006. - : IEEE.
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Konferensbidrag (refereegranskat)abstract
- A formulation based on multirate theory is introduced for analog-to-digital converters using parallel sigma-delta modulators in conjunction with modulation sequences. It is shown how the formulation can be used to analyze a system's sensitivity to channel mismatch errors by means of circulant and pseudo-circulant matrices. It is demonstrated how the time-interleaved-modulated (TIM), Hadamard-modulated (HM) and frequency-band decomposition (FBD) converters can be viewed as special cases of this more general description, and it is shown why the TIM and HM ADCs are sensitive to channel mismatch errors, whereas the FBD ADCs are not.
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| 2. |
- Blad, Anton, 1981-, et al.
(författare)
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Design Trade-Offs for Linear-Phase FIR Decimation Filters and SD-Modulat ors
- 2006
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Ingår i: 14th European Signal Processing Conference,2006. - Wien, Austria : EURASIP.
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Konferensbidrag (refereegranskat)abstract
- In this paper we examine the relation between signal-to-noise-ratio, oversampling ratio, transition bandwidth, and filter order for some commonly used sigma-delta-modulators and corresponding decimation filters. The decimation filters are equi-ripple finite impulse response filters and it is demonstrated that, for any given filter order, there exists an optimum choice of the stopband ripple and stopband edge which minimizes the signal-to-noise-ratio degradation.
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| 3. |
- Elias, Elizabeth, et al.
(författare)
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Design of M-channel tree-structured filter banks with very low-complexity analysis filters
- 2000
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Ingår i: IEEE International Conference on Electronics Circuits and Systems,2000. - : IEEE. - 0780365429 ; , s. 87-90 vol.1
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Konferensbidrag (refereegranskat)abstract
- A class of M-channel tree-structured digital filter banks is considered with half-band IIR analysis filters and FIR synthesis filters. The filter banks approximate perfect reconstruction with an exact linear phase response and zero aliasing. This particular configuration has a very low-complexity analysis filter bank. In this paper we address the problem of minimizing the synthesis filter complexity, given the minimum-complexity analysis filters. The filter banks are designed using linear and nonlinear programming
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| 4. |
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| 5. |
- Elias, Elizabeth, et al.
(författare)
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Tree-structured IIR/FIR octave-band filter banks with very low-complexity analysis filters
- 2001
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Ingår i: IEEE International Symposium on Circuits and Systems,2001. ; , s. 533-536
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Konferensbidrag (refereegranskat)abstract
- A class of tree-structured octave-band digital filter banks is introduced. The filter banks make use of half-band IIR filters in the analysis bank and FIR filters in the synthesis bank which results in very low-complexity analysis filters. Further, the overall complexity is lower than, or comparable to, that of conventional filter banks. The overall filter banks approximate perfect reconstruction in the following sense. The distortion function is a linear-phase function approximating one in magnitude whereas the aliasing terms approximate zero. The filter banks are designed using linear and nonlinear programming. Design examples are included demonstrating the properties of the new filter banks
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| 6. |
- Elias, Elizabeth, et al.
(författare)
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Tree-structured IIR/FIR uniform-band and octave-band filter banks with very low-complexity analysis or synthesis filters
- 2003
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Ingår i: Signal Processing. - 0165-1684 .- 1872-7557. ; 83:9, s. 1997-2009
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Tidskriftsartikel (refereegranskat)abstract
- This paper introduces new tree-structured uniform-band and octave-band digital filter banks (FBs). These FBs make use of half-band IIR filters in the analysis FBs and FIR filters in the synthesis FBs. The resulting FBs are asymmetric in the sense that the analysis FB has a very low arithmetic complexity whereas that in the synthesis FB is higher. However, compared with other asymmetric FBs, the proposed ones have in many cases a lower overall arithmetic complexity and delay. The proposed FBs have magnitude distortion but no phase distortion, further, the aliasing components are either zero (uniform-band case) or approximately zero (octave-band case). The FBs are designed using linear and nonlinear programming. Design examples are included demonstrating the properties of the proposed filters banks. ⌐ 2003 Published by Elsevier B.V.
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| 7. |
- Elias, Elizabeth, et al.
(författare)
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Two-channel IIR/FIR filter banks with very low-complexity analysis or synthesis filters : finite wordlength effects
- 2001
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Ingår i: IEEE Midwest Symposium on Circuits and Systems,2001. ; , s. 126-129
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Konferensbidrag (refereegranskat)abstract
- A new class of two-channel IIR/FIR filter banks was introduced by the authors in 2000 with half-band IIR analysis filters and FIR synthesis filters. This type of filter bank features very low-complexity analysis filters and simultaneously a low overall complexity. In this paper, we consider finite-wordlength effects of these filter banks
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| 8. |
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| 9. |
- Hägglund, Robert, 1975-, et al.
(författare)
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A polynomial-based division algorithm
- 2002
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Ingår i: IEEE Int. Symp. Circuits and Systems, 2002. - 0780374487 ; , s. III-571-III-574
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Konferensbidrag (refereegranskat)abstract
- A polynomial-based division algorithm and a corresponding hardware structure are proposed. The proposed algorithm is shown to be competitive to other conventional algorithms like the Newton-Raphson algorithm for up to about 32 bits accuracy. For example, using Newton-Raphson with less than 12 bits accuracy of the initial approximation, requires 33% more general multiplications than the proposed algorithm, in order to achieve 24 bits accuracy.
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| 10. |
- Johansson, Håkan, 1969-, et al.
(författare)
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Flexible frequency-band reallocation networks based on variable oversampled complex-modulated filter banks
- 2005
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Ingår i: IEEE International Conference on Acoustics Speech and Signal Processing,2005. ; , s. iii/973-iii/976
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Konferensbidrag (refereegranskat)abstract
- An important issue in the next-generation satellite-based communication systems is the satellite on-board reallocation of information which calls for digital flexible frequency-band reallocation (FFBR) networks. This paper introduces a new class of FFBR networks based on variable oversampled complex-modulated filter banks (FBs). The new class can outperform previously existing ones when flexibility, low complexity and inherent parallelism, perfect frequency-band reallocation, and simplicity are considered simultaneously.
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