This document contains the results of simulations and prototyping for the ARGOS digital signal processing backend as conducted by Work Package 6 (WP6) of the ARGOS-CDS project. WP6 is responsible for the design of the digitisation and channelisation system for the ARGOS antennas and with the data transport, correlation, and beamforming that is required to enable the telescope to perform as an interferometer. In this document, we present simulation results for the following: • Data transport for digitised/channelised voltages streams between the ARGOS antennas and the downstream processing hardware. • Beamforming optimisations based on different array geometries. We further present the results of the following prototyping activities: • Development of a demonstrator digitiser-channeliser on an RFSoC evaluation board. • Development of a demonstrator beamformer-correlator on tensor-core capable GPUs