Domains¶

Every guide, gallery and design page is filed under one domain: the Python module that holds the class, with a title for the task. Find the task, open its domain, and the page lists its classes and functions with their API entries and examples, and the pages filed there. The full alphabetical list is the A-Z index.

Sources¶

Domain	Module	What it holds
Signal sources	`doppler.source`	Oscillators and noise: the NCO, the LO and AWGN.
Waveform generation (wfm)	`doppler.wfm`	Compose, generate and stream any waveform: the Synth, scenes and Plans, codes, frames, and the wfmgen tool.

Impairment¶

Domain	Module	What it holds
Channel impairment	`doppler.impairment`	What a channel does to a signal: a Doppler channel with clock Doppler, delay and noise.

Filtering¶

Domain	Module	What it holds
Filtering	`doppler.filter`	FIR and moving-average filters.
Interpolation	`doppler.interp`	A table-driven interpolator for fractional-delay lookups.
Delay lines	`doppler.delay`	Fractional and integer sample delay.

Rate conversion¶

Domain	Module	What it holds
Rate conversion & resampling	`doppler.resample`	Polyphase resampling, rate converters and halfband decimators.

Down-conversion¶

Domain	Module	What it holds
Down-conversion (DDC)	`doppler.ddc`	Complex- and real-input digital down-converters, and their matched flavors.

Spectral¶

Domain	Module	What it holds
Spectral analysis	`doppler.spectral`	FFTs, correlators, power spectra and spectrograms.
Spectrum analyzer	`doppler.analyzer`	Specan: a windowed, averaged power spectrum in dBFS.
Measurement suite	`doppler.measure`	Tone, NPR and two-tone IMD metrics returned as named records.

Synchronization¶

Domain	Module	What it holds
Acquisition	`doppler.acquire`	Finding a signal before anything tracks it: bursts, preambles and carriers.
Tracking & synchronization	`doppler.track`	Loop filters, carrier and timing recovery, and the narrowband receivers built on them.
Automatic gain control (AGC)	`doppler.agc`	A log-domain feedback AGC.

Receivers¶

Domain	Module	What it holds
Spread spectrum (DSSS)	`doppler.dsss`	Despreading, polynomial-phase estimation and the DSSS receivers.

Modulation¶

Domain	Module	What it holds
M-PSK modulation	`doppler.mpsk`	M-ary PSK symbol map and demap, hard, soft and differential.

Coding¶

Domain	Module	What it holds
Channel coding	`doppler.coding`	Convolutional, Reed-Solomon and interleaving codes.
CCSDS literals	`doppler.ccsds`	The values CCSDS 131.0-B picked for synchronization and coding.

Estimation¶

Domain	Module	What it holds
Detection statistics	`doppler.detection`	Pd, Pfa and threshold models, a lock detector and a sync-word finder.
Bit-error rate (BER)	`doppler.ber`	A BER meter that aligns a recovered stream to a reference.
SNR estimation	`doppler.snr`	Data-aided and moment-based SNR and Es/N0 estimators.

I/O¶

Domain	Module	What it holds
Streaming	`doppler.stream`	Publish/subscribe, push/pull and request/reply of IQ over NATS.
Buffers	`doppler.buffer`	Lock-free ring buffers between a producer and a consumer.
Telemetry	`doppler.telemetry`	In-band probes that record loop internals.
Stopping a run (interrupt)	`doppler.interrupt`	The one flag every blocking wait consults.

Numeric¶

Domain	Module	What it holds
Accumulators	`doppler.accumulator`	Running sums and trace accumulators.
Fixed-point arithmetic	`doppler.arith`	Q8 and Q15 accumulators with exact integer arithmetic.
Sample-format conversion (cvt)	`doppler.cvt`	Converters between float IQ and fixed-point integers.
Utilities	`doppler.util`	Numeric helpers shared across the modules.