Analysis and Design of Two Stage Mismatch Quantizer for Laplacian Source

Zoran H. Peric, Nikola Simic, Milan S. Savic

Abstract


Two stage quantization is a well-known but still very popular model for signal processing. However, in a number of occasions we have information about a discrete entrance and we do not know the nature of the continuous signal which preceded it. Hence, information source is commonly modelled by using Laplacian or Gaussian distribution but designed quantizers often do not match entire signal range. A typical analysis for discretized input signal does not consider the changes of the continuous signal variance. The aims of this paper are providing an improved analysis by introducing a novel measure CDSVR, designing the second stage quantizer, as well as estimating system performance for mismatched variances. This way, we discuss the influence of A/D conversion on the signal variance and propose an improved model for performance estimation.

DOI: http://dx.doi.org/10.5755/j01.eee.21.3.10380


Keywords


Mismatch quantization; Modelling; Laplacian source; Two stage quantizer.

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