This short paper explores density evolution (DE) for low-density parity-check (LDPC) codes at signal-to-noise-ratios (SNRs) that are significantly above the decoding threshold. The focus is on the additive white Gaussian noise channel and LDPC codes in which the variable nodes have regular degree. Prior work, using DE, produced results in the error floor region which were asymptotic in the beli...

The use of the Allan variance for the characterization of the jitter timebase error in waveform digitizers is proposed. With this aim, the Allan variance is shown to be a sound basis for defining and measuring a suitable figure of merit, diagnosing the jitter noise type, and including a jitter error block into a previously proposed digitizer model. Experimental results highlighting the effectiv...

The aim of many microarray experiments is to build discriminatory diagnosis and prognosis models. Given the huge number of features and the small number of examples, model validity which refers to the precision of error estimation is a critical issue. Previous studies have addressed this issue via the deviation distribution (estimated error minus true error), in particular, the deterioration of...