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The Large European Array for Pulsars combines Europe's largest radiotelescopes to form a tied-array telescope that provides high signal-to-noiseobservations of millisecond pulsars (MSPs) with the objective to increase thesensitivity of detecting low-frequency gravitational waves. As part of thisendeavor we have developed a software correlator and beamformer which enablesthe formation of a tied-array beam from the raw voltages from each oftelescopes. We explain the concepts and techniques involved in the process ofadding the raw voltages coherently. We further present the software processingpipeline that is specifically designed to deal with data from widely spaced,inhomogeneous radio telescopes and describe the steps involved in preparing,correlating and creating the tied-array beam. This includes polarizationcalibration, bandpass correction, frequency dependent phase correction,interference mitigation and pulsar gating. A link is provided where thesoftware can be obtained.

The beamformer and correlator for the Large European Array for Pulsars