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A Software Defined Radio library written in Haskell
See the blog post.
- Write software defined radio applications in Haskell
- Signal processing blocks can be chained together using the Pipes library
- Zero copy design
- Signal processing functions are implemented in both Haskell and C:
- Optimised C implementations of signal processing functions that utilise SIMD instructions
- Performance of Haskell signal processing functions within a factor of 2 of C (without SIMD) thanks to the vector library, stream fusion and ghc's LLVM backend
- Can filter, decimate and resample
- Helper functions for FIR filter design using window functions and plotting of the frequency response
- FFTs using FFTW
- Line and waterfall plots using OpenGL
- FM demodulation
- PulseAudio sound sink
- rtl-sdr and BladeRF based radio sources/sinks supported and other sources are easily added
- Extensive benchmark and test suites of signal processing functions
A chunk of the FM broadcast spectrum. Captured with an RTLSDR device and drawn as a waterfall using the Plot module.
This library will only build and run on 64 bit x86 Linux systems.
You can install it from Hackage:
cabal install sdr
Or, you can build it with cabal sandboxes:
cabal sandbox init git clone https://github.com/adamwalker/dynamic-graph git clone https://github.com/adamwalker/haskell-fftw-simple git clone https://github.com/adamwalker/sdr cabal sandbox add-source dynamic-graph haskell-fftw-simple sdr cabal install sdr
Clone and build:
git clone https://github.com/adamwalker/sdr-apps cabal sandbox add-source sdr-apps cabal install sdr-apps
To run the FM receiver:
.cabal-sandbox/bin/fm -f <your favourite station, e.g. 90.2M>
To run the waterfall plot:
.cabal-sandbox/bin/waterfall -f <center frequency, e.g. 90.2M> -r <sample rate, e.g. 1280M>
To run the AM receiver:
.cabal-sandbox/bin/am -f <center frequency, e.g. 124.4M>
Documentation is available on Hackage.
An FM receiver:
import Control.Monad.Trans.Either import Data.Vector.Generic as VG import Pipes import qualified Pipes.Prelude as P import SDR.Filter import SDR.RTLSDRStream import SDR.Util import SDR.Demod import SDR.Pulse import SDR.CPUID --The filter coefficients are stored in another module import Coeffs samples = 8192 frequency = 105700000 main = eitherT putStrLn return $ do info <- lift getCPUInfo str <- sdrStream (defaultRTLSDRParams frequency 1280000) 1 (fromIntegral samples * 2) lift $ do sink <- pulseAudioSink deci <- fastDecimatorC info 8 coeffsRFDecim resp <- fastResamplerR info 3 10 coeffsAudioResampler filt <- fastFilterSymR info coeffsAudioFilter runEffect $ str >-> P.map (interleavedIQUnsignedByteToFloatFast info) >-> firDecimator deci samples >-> fmDemod >-> firResampler resp samples >-> firFilter filt samples >-> P.map (VG.map (* 0.2)) >-> sink
I started this project to learn about signal processing. I still have no idea what I'm doing.
Only tested on Arch Linux.
If you actually use this library for anything, let me know: adamwalk[email protected]