Yarsdr

Yarsdr is an open-source software framework for software-defined radio (SDR) applications. It provides a modular toolkit for designing, simulating, and deploying digital radio workflows, including signal acquisition, processing, modulation, and demodulation. The framework is designed to be hardware-agnostic, offering abstractions for data streams, sample formats, and processing blocks, and supporting multiple backends and hardware interfaces.

It uses a block-based processing model in which DSP components such as mixers, filters, oscillators, samplers, and decoders are connected into processing graphs. Users configure pipelines through a configuration language or API, enabling rapid prototyping of radio systems. Core components include a scheduler, a data bus, and a modular DSP library; the library includes common modulation schemes (FM, AM, QPSK, QAM) and error-correction primitives. The system supports real-time operation and offline simulation, and can interoperate with other SDR ecosystems via bridging components.

Yarsdr originated in the open-source SDR community as an acronym for Yet Another Radio SDR and was released under a permissive license to encourage interoperability. It is maintained by a distributed community of developers, with contributions ranging from core kernel improvements to hardware-specific drivers. The project hosts documentation, examples, and tutorials to support learners and researchers. It is used in education and hobbyist projects as a lightweight alternative to heavier SDR stacks.