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In this paper, we implement a low-latency rapid-prototyping platform forsignal processing based on software-defined radios (SDRs) and off-the-shelf PChardware. This platform allows to evaluate a wide variety of algorithms inreal-time environments, supporting new developments in the fields of classical,AI-based, and hybrid signal processing. To accomplish this, the streamingprotocol of the used USRP X310 devices is implemented using the Data PlaneDevelopment Kit (DPDK), which allows to handle network communication inuserspace only. This bypasses the kernel and thus avoids the latencies causedby interrupt handling, scheduling, and context switches. It allows signalprocessing to be performed on isolated processor cores that are protected frominterrupts to a great extent. To validate our approach, linear time-invariantchannel emulation has been implemented. For this, an analog-to-analog latencyof 31 microseconds was achieved, demonstrating that our PC-based approachenables the implementation of rapid-prototyping systems with low latency.

Low-Latency Analog-to-Analog Signal Processing using PC Hardware and USRPs