Ryan Malloy
c839d225a8
GNU Radio Out-of-Tree module providing: - Complete TX chain: PHYEncode → FrameGen → CSSMod - Complete RX chain: CSSDemod → FrameSync → PHYDecode - NETWORKID extraction/encoding (0-255 range) - All SF (7-12) and CR (4/5-4/8) combinations - Loopback tested with 24/24 configurations passing Key features: - Fractional SFD (2.25 downchirp) handling - Gray encode/decode with proper inverse operations - gr-lora_sdr compatible decode modes - GRC block definitions and example flowgraphs - Comprehensive documentation Discovered RYLR998 sync word mapping: sync_bin_1 = (NETWORKID >> 4) * 8 sync_bin_2 = (NETWORKID & 0x0F) * 8
54 lines
1.2 KiB
YAML
54 lines
1.2 KiB
YAML
id: rylr998_css_demod
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label: RYLR998 CSS Demodulator
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category: '[RYLR998]/Demodulation'
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flags: [python, cpp]
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documentation: |-
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CSS (Chirp Spread Spectrum) demodulator for LoRa signals.
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Performs FFT-based peak detection on dechirped LoRa symbols to extract
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encoded bin values. Each symbol's bin encodes SF bits of information.
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Input: Complex IQ samples at the specified sample rate
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Output: Integer bin values (0 to 2^SF - 1)
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The demodulation process:
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1. Multiply received signal by reference downchirp (dechirp)
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2. FFT to convert frequency ramp to single tone
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3. Find peak bin location
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templates:
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imports: from rylr998 import css_demod
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make: rylr998.css_demod(sf=${sf}, sample_rate=${sample_rate})
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parameters:
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- id: sf
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label: Spreading Factor
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dtype: int
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default: 9
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options: [7, 8, 9, 10, 11, 12]
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option_labels: ['SF7', 'SF8', 'SF9', 'SF10', 'SF11', 'SF12']
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- id: sample_rate
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label: Sample Rate (Hz)
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dtype: real
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default: 250e3
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- id: bw
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label: Bandwidth (Hz)
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dtype: real
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default: 125e3
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inputs:
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- label: in
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domain: stream
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dtype: complex
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outputs:
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- label: out
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domain: message
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dtype: int
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optional: false
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file_format: 1
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