1. Performance Analysis and Optimal Filter Design for Sigma-Delta Modulation via Duality With DPCM.
- Author
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Ordentlich, Or and Erez, Uri
- Subjects
- *
SIMULATION methods & models , *QUANTIZATION (Physics) , *DELTA-sigma modulation , *ELECTRIC current converters , *BANDWIDTHS , *PROBABILITY theory - Abstract
Sampling above the Nyquist rate is at the heart of sigma–delta modulation, where the increase in sampling rate is translated to a reduction in the overall (mean-squared-error) reconstruction distortion. This is attained by using a feedback filter at the encoder, in conjunction with a low-pass filter at the decoder. The goal of this paper is to characterize the optimal trade-off between the per-sample quantization rate and the resulting mean-squared-error distortion under various restrictions on the feedback filter. To this end, we establish a duality relation between the performance of sigma–delta modulation and the performance of differential pulse-code modulation when applied to (discrete-time) band-limited inputs. As the optimal trade-off for the latter scheme is fully understood, the full characterization for sigma–delta modulation, as well as the optimal feedback filters, immediately follows. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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