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A "large-N" correlator that makes use of Field Programmable Gate Arrays andGraphics Processing Units has been deployed as the digital signal processingsystem for the Long Wavelength Array station at Owens Valley Radio Observatory(LWA-OV), to enable the Large Aperture Experiment to Detect the Dark Ages(LEDA). The system samples a ~100MHz baseband and processes signals from 512antennas (256 dual polarization) over a ~58MHz instantaneous sub-band,achieving 16.8Tops/s and 0.236 Tbit/s throughput in a 9kW envelope and singlerack footprint. The output data rate is 260MB/s for 9 second time averaging ofcross-power and 1 second averaging of total-power data. At deployment, theLWA-OV correlator was the largest in production in terms of N and is the thirdlargest in terms of complex multiply accumulations, after the Very Large Arrayand Atacama Large Millimeter Array. The correlator's comparatively fastdevelopment time and low cost establish a practical foundation for thescalability of a modular, heterogeneous, computing architecture.

Digital Signal Processing using Stream High Performance Computing: A 512-input Broadband Correlator for Radio Astronomy