An error measurement for resampled level crossing signal

Abstract

This work is a contribution to enhance the signal processing chain required in mobile systems. The system must be efficient in terms of resources utilisation like memory, computation complexity, data transmission, battery consumption, etc. In the aim to achieve these features an event driven signal acquisition, processing and transmission chain based on level crossing and activity selection is adopted. It delivers non-uniformly spaced samples. The employment of efficient and mature classical signal processing tools requires the uniform resampling of level crossing sampled signal. In this context, three resampling techniques, Sample&Hold, Nearest Neighbor and Linear Interpolation, for level crossing sampled signal are examined. Their performance is studied in terms of computational complexity and the resampling accuracy. The resampling error is measured in time domain. It has advantages compared to its counter frequency domain methods. Firstly it does not require the computationally complex frequency domain signal transformation. Secondly it does not introduce distortions, could appear during this frequency domain transformation.