Tunable Digital Filter for the ALMA Correlator - RadioNet

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Digital Backend Meeting MPIfR Bonn - Sep 6, 2004Subchannel stitchingSimulation data setSimulation data set• Gaussian noise: completely stochastic signal to simulate real data• Independent uncorrelated noise and correlated signal• Variable phase relation between the two signals• Maximum correlation coefficient ~0.3• 65 Msample: 16 ms of real data• Reference cross spectrum obtained using a 2048 ch. continuouscorrelator
Digital Backend Meeting MPIfR Bonn - Sep 6, 2004• Result from hybrid correlatorcompared to referencespectrum• Hybrid spectrum both withand without final 2-bitquantization to discriminateeffectsSubchannel stitchingResult analysisDifference within noise except corresponding to strong linesNo difference except excess noise in spectrum with 2-bit quantization35 dB of measured dynamic range, despite unrealistc strong spectral lines
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Tunable Digital Filter for the ALMA Correlator - RadioNet

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