Conference Proceeding

Linear decoding algorithm obtained from nonlinear analysis of sigma-delta modulators

06/2004; DOI:10.1109/ISCAS.2004.1328826 In proceeding of: Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on, Volume: 3
Source: IEEE Xplore

ABSTRACT Usually sigma-delta modulators (ΣΔM) are modelled by replacing the quantizer with an additive white noise source. This linear modelling leads to decoder structures realizing approximately a linear rectangular filter. However, due to the low resolution quantizer the ΣΔM is an inherently nonlinear system. This might mean that a nonlinear analysis could yield more effective decoder structures including better linear filters. In this paper a new linear filtering approach for decoder design is proposed. It achieves a decoding performance superior to rectangular filtering.

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Keywords

additive white noise source
 
decoder design
 
effective decoder structures
 
inherently nonlinear system
 
linear filters
 
linear modelling
 
linear rectangular filter
 
low resolution quantizer
 
new linear
 
nonlinear analysis
 

I. Wiemer