Gallery

Output plots from the example scripts in examples/python/. Run make gallery to regenerate all images.

• wfmgen — One Engine, Every Waveform

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  Tone, PN (MLS thumbtack), QPSK and BPSK constellations from one declarative Synth — the engine behind the wavegen/wfmgen tools.

  Walkthrough

• Composing a Scene — sum, add, headroom

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  A QPSK SoI under a CW interferer over one resolved noise floor (.sum()), sequenced after a preamble (.add()), with PAPR / clip / headroom and the SoI's Es/No.

  Walkthrough

• Four WCDMA Carriers — Welch & AccTrace

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  Four RRC-shaped WCDMA channels at 0 / -3 / -6 / -10 dBFS, measured with Welch — averaged PSD, per-channel band_power, occupied bandwidth, SNR, ACLR — and AccTrace mean vs. max-hold.

  Walkthrough

• AGC — Step Response

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  20 dB power step tracked within ~350 samples. All three decimation settings converge identically.

  Walkthrough

• CIC Decimation Filter

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  Wideband IQ → CIC → narrowband slice. Jammer alias attenuated ~90 dB; offset-binary UQ16 integer pipeline shown in middle panel.

  Walkthrough

• Q15 vs UQ15 Quantization

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  Bipolar and offset-binary encodings of the same Q15 step — identical noise floor, different integer conventions.

  Walkthrough

• cvt Quantization Noise

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  All three cvt formats (I16, I16U32, I16U64) overlaid — identical Q15 noise floor across 80 dB dynamic range.

  Walkthrough

• Correlation and Detection

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  Coherent integration, 2-D template matching, and streaming CFAR detection in one run.

  Walkthrough

• Detection Theory Curves

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  Pd vs SNR and Pd vs dwell from closed-form Marcum Q. Every 3 dB SNR halves the required dwell.

  Walkthrough

• Monte Carlo vs Marcum Q

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  30 000 trials per SNR point. Empirical survival functions and Pd vs SNR match theory throughout.

  Walkthrough

• 2-D Acquisition Grid

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  GPS/CDMA-style 16 × 16 Doppler × code-phase search in one FFT2 call. Bonferroni-corrected CFAR.

  Walkthrough

• RateConverter — Cascade Selection

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  CIC, halfband, and polyphase Resampler stages selected automatically by rate ratio. Tone-frequency preservation verified across four regimes.

  Walkthrough

• Functional DDCR — Real to Baseband

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  The capsule-state ddcr_* API: real passband in, complex baseband out, 4× decimation. Carrier parked at DC, retuned phase-continuously, plus a GIL-released thread-per-shard core-scaling curve.

  Walkthrough

• HBDecimQ15 — Fixed-Point Halfband

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  Q15 halfband 2:1 decimator for interleaved IQ int16. AVX2 two-pass madd inner loop; passband flat, stopband −60 dB.

  Walkthrough

• ADC Quantisation — 3–8 Bits

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  Staircase resolution and spectral noise floor across six bit depths. Each additional bit halves the step size and drops noise by 6 dB.

  Walkthrough