Improving the near-perfect hybrid filter bank performance in the presence of realization errors

“…Using this set of analysis filters, the analysis filter matrix has been calculated according to (3) and (4). Then, synthesis filter bank is obtained using (6). Each element F i,j (e jω ) of the synthesis filters matrix may be approximated by an FIR synthesis filter.…”

Section: Resultsmentioning

confidence: 99%

“…This relation may be established for N frequency points (N >> 1) [5]. Thus, the frequency response of each synthesis filter F ij (e jω ) is obtained using (6). An FIR filter may be considered for estimating the (i, j) th element F i,j (e jω ) of the synthesis filters matrix.…”

Section: Subband Hfb-based A/d Convertermentioning

confidence: 99%

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Performance of subband HFB-based A/D converters

Asemani

Oksman

2007

2007 9th International Symposium on Signal Processing and Its Applications

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Abstract-Subband Hybrid Filter Bank (HFB) structures may replace the classic ones in parallel A/D Converters (ADC). In this paper, subband and original HFB-based A/D converters are simulated and compared in the time domain. For this purpose, firstly a brief survey on subband HFB-based A/D converters is presented. According to the simulations, subband HFB-based ADC exhibits a lower sensitivity to realization errors than classic one. Besides, compensation techniques such as noise canceling may be used for correcting the analog imperfections of subband HFB. This is not possible for classic HFB. The output resolution of subband HFB-based ADC is shown to be better than the one related to classic architecture using FIR synthesis filters with the same order for some exemplary inputs. Computation complexity related to subband architecture is compared with the one due to classic structure. It may be seen that subband HFB-based ADC includes less computational complexity than the classic architecture if an adaptive compensation of analog imperfections is considered.

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“…al. tried to optimize the design of HFB structures in terms of realization errors [7], but their proposed solution does not include a compensation technique. They have only proposed a weighted criterion of distortion and aliasing terms which only leads to less than five dB of improvement.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Time-Division Multiplexing Parallel A/D Converters to Analog Imperfection

Asemani

Oksman

2007

2007 IEEE Workshop on Signal Processing Systems

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In this paper, the Time-Division Multiplexing (TDM) architecture for the Hybrid Filter Bank (HFB) A/D Converters (ADCs) is studied in the time domain. Giving a brief survey on the TDM structure, the classical and TDM HFB-based ADCs are compared in terms of the output resolution for some input signals. To study the sensitivity to the realization errors, both structures are simulated assuming the same realization errors in the analysis filter banks. The TDM HFBbased ADC exhibits a better performance either in the presence or in the absence of realization errors than the classical one. Besides, the input-output relationship is demonstrated to be Linear Time-Invariant (LTI) for the TDM HFB, but it is non-LTI in the the classical HFB case. Thus, it is possible only in the TDM case that a blind deconvolution method is employed for adaptively compensating the realization errors.

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Improving the near-perfect hybrid filter bank performance in the presence of realization errors

Cited by 13 publications

References 5 publications

Wideband, Bandpass, and Versatile Hybrid Filter Bank A/D Conversion for Software Radio

Wideband, Bandpass, and Versatile Hybrid Filter Bank A/D Conversion for Software Radio

Performance of subband HFB-based A/D converters

Sensitivity of Time-Division Multiplexing Parallel A/D Converters to Analog Imperfection

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