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Basic Send-on-Delta Sampling for Signal Tracking-Error Reduction
Miguel Diaz-Cacho1, Emma Delgado2, Antonio Barreiro3
1School of Computer Engineering, Campus de Ourense, Edificio Politecnico, 32004 Ourense, Spain. mcacho@uvigo.es.
Abstract:
This paper investigates the dynamic selection of an appropriate threshold for basic Send-on-Delta (SoD) sampling strategies, given an available transmission rate to reduce the signal tracking-error. The paper formulates the error-reduction principle and proposes an algorithm that calculates, in real time, the amplitude threshold value (also called delta value) for a desired mean transmission rate. The algorithm is implemented to be computed in a Send-on-Delta driver and is tested with three signals that match the step response of a second order control system. Comparison results with a conformant periodic transmission strategy reveals that it improves deeply the tracking-error while maintaining the desired average throughput.
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