Datasets:

okra123
/

CISR24

The public release ID is CISR24. It is not a filtered view of a larger label space. All manifests, HDF5 files, class IDs, and label names are generated directly in the 24-class label space defined by the paper.

2. Final Taxonomy

2.1 Communication classes: 10

BPSK
QPSK
8PSK
16QAM
4FSK
8FSK
GMSK
OFDM-BPSK
OFDM-QPSK
OFDM-16QAM

2.2 Radar sensing classes: 6

Rect
Barker
LFM
Costas
Frank
P4

2.3 ISAC classes: 8

LFM-BPSK
LFM-QPSK
LFM-8PSK
LFM-MSK
LFM-GMSK
OFDM-LFM-BPSK
OFDM-LFM-QPSK
OFDM-LFM-16QAM

3. Global Record Definition

sampling rate: fs = 10 MHz
record length: L = 1024
record duration: 102.4 us
representation: complex baseband IQ
numeric type: float32

4. Clean Release Rules

These rules apply to every class.

4.1 Baseband only

All classes are generated and stored in complex baseband.

no class-specific fixed carriers
no superclass-specific center-frequency assignments

4.2 Power normalization and SNR definition

For every example:

generate the active waveform burst
apply random initial phase
normalize the active burst to unit average power
embed the burst into the 1024-sample record with random start offset
add complex AWGN using the active-burst power as the SNR reference

The release audit verifies this convention independently from the nominal SNR labels. It gates every class/SNR cell using the inactive interval's pure-noise power, then pools records at each split/SNR level to check unit-power active burst normalization with an active-minus-inactive estimate.

Interpretation:

snr_db in the manifest refers to active-burst SNR
effective_snr_basis = active_burst

4.3 Clean-version randomization only

Allowed:

random symbol realization or code realization
random pulse or burst start offset
random initial phase
AWGN at target snr_db
waveform-internal parameter draws from small discrete sets

Not included in this clean release:

CFO
IQ imbalance
multipath fading
delayed radar echoes
clipping
quantization stress

These remain evaluation-time or future robust-variant factors.

5. Split Policy

Balanced IID benchmark:

train: 1000 examples per class per SNR
val: 200 examples per class per SNR
test: 200 examples per class per SNR

SNR grid:

-20, -18, ..., 20 dB
total SNR levels: 21

Independent generation:

train/val/test are generated independently
different splits use different seeds
no split is obtained by slicing the same mother waveform bank

6. Activity-Length Control

To reduce activity-length leakage, the rebuild intentionally increases overlap between waveform families.

6.1 Support policy

communication single-carrier bursts use active support from {576, 640, 704, 768, 832}
radar pulse-like classes also concentrate in the same broad support range
OFDM uses native packet lengths from 2 or 3 OFDM symbols
OFDM-LFM shares the same native packet lengths, avoids standalone preamble concatenation, and uses a hybrid partial chirp-subcarrier design on data carriers

6.2 Release criterion

The release must be accompanied by a shortcut audit. At minimum:

active_len
bw95
spectral centroid
spectral spread
crest factor
envelope sparsity
peak count in the periodogram

7. Waveform-Specific Design

7.1 Communication: single-carrier classes

Applies to:

BPSK
QPSK
8PSK
16QAM
4FSK
8FSK
GMSK

Linear modulations

Applies to:

BPSK
QPSK
8PSK
16QAM

Rules:

sps = 4 and Rs = 2.5 Msps
Gray mapping
root-raised-cosine pulse shaping
beta in {0.25, 0.35}
span = 8 symbols
16QAM uses unit-average-power normalization before pulse shaping

4FSK / 8FSK

Implementation:

canonical CPFSK construction with continuous phase
sps = 8 and Rs = 1.25 Msps
modulation index h = 0.5
adjacent tone spacing Δf = h * Rs = 0.625 MHz
tone spacing is stored in metadata as cpfsk_tone_spacing_hz

GMSK

Rules:

BT = 0.3
sps = 4
Rs = 2.5 Msps

7.2 Communication: OFDM classes

Applies to:

OFDM-BPSK
OFDM-QPSK
OFDM-16QAM

Default numerology:

N_fft = 256
N_cp = 32
N_active in {96, 128}
OFDM symbols per packet M in {2, 3}

Subcarrier layout:

occupied subcarriers are symmetric around DC
DC is always null
4 fixed pilot tones are inserted within the occupied subcarriers
the remaining occupied subcarriers carry BPSK / QPSK / 16QAM data symbols

Time-domain lengths:

2 symbols -> 576
3 symbols -> 864

7.3 Radar sensing classes

All radar examples are treated as single-pulse intrapulse snapshots.

Rect

active support drawn from {576, 640, 704, 768, 832}

Barker

Lb in {7, 11, 13}
chip counts and chip durations are chosen to overlap the support range of the other radar classes

LFM

chirp bandwidth B in {2, 3, 4} MHz
chirp direction random in {up, down}
active support drawn from {576, 640, 704, 768, 832}

Costas

Nc in {7, 11, 13}
frequency step Df in {0.25, 0.5} MHz
one valid Costas base permutation per length, plus symmetry-derived variants
chosen permutation ID is written as costas_perm_id

Frank

order M = 4
16 phase chips
chip samples in {36, 40, 44, 48, 52}

P4

code length N in {16, 32}
chip samples chosen so total support stays close to the shared radar support range

7.4 ISAC classes

ISAC examples are defined as short packet-level or burst-level snapshots.

LFM-single-carrier ISAC

Applies to:

LFM-BPSK
LFM-QPSK
LFM-8PSK

Construction:

generate a centered baseband LFM chirp over the target support
apply symbol-wise PSK phase coding on top of the chirp
chirp bandwidth B in {2, 3, 4} MHz
chirp direction random
this family is retained as a sensing-centric chirp-carried communication variant

Signal model:

x(t) = c_lfm(t) * exp(j*phi_k)

LFM-CPM ISAC

Applies to:

LFM-MSK
LFM-GMSK

Construction:

generate a constant-envelope CPM waveform (MSK or GMSK)
multiply it by a baseband LFM chirp over the same support
chirp bandwidth B in {2, 3, 4} MHz
chirp direction random

Signal model:

x(t) = s_cpm(t) * c_lfm(t)

OFDM-LFM ISAC

Applies to:

OFDM-LFM-BPSK
OFDM-LFM-QPSK
OFDM-LFM-16QAM

Construction:

use the same OFDM packet structure as the communication OFDM classes
retain the same OFDM numerology and pilot layout as the communication OFDM classes
keep the same OFDM active-bin layout as the communication OFDM classes
retain regular OFDM pilots on all pilot bins
select a comb-interleaved subset of data carriers as chirp-enhanced carriers
synthesize the final time-domain symbol as a hybrid mixture of regular OFDM and chirp-shaped basis functions on that data-carrier subset
keep inactive bins and DC null consistent with the communication OFDM classes
retain chirp_bw_hz and chirp_dir in metadata
no fixed chirp preamble is used

8. Release Storage

Full release root:

$CISR24_OUTPUT_ROOT (or dataset/releases/CISR24)

Files:

hdf5/cisr24_train.h5
hdf5/cisr24_val.h5
hdf5/cisr24_test.h5
manifests/cisr24_train_manifest.csv
manifests/cisr24_val_manifest.csv
manifests/cisr24_test_manifest.csv
label_names.txt
classes.csv

9. Manifest Schema

Core fields:

sample-id
split
h5-rel-path
h5-dataset
h5-index
class-id
super-class
class-name
waveform-family
snr-db
fs-hz
n-samples
seed
active-len
start-offset
channel-profile
release-name
iid-or-ood

Waveform-parameter fields:

symbol-rate-hz
sps
nfft
cp-len
n-active
chirp-bw-hz
chirp-dir
pulse-width-us
barker-len
costas-len
frank-order
p4-len
rrc-beta
ofdm-num-symbols
costas-df-hz
costas-perm-id
chip-samples
gmsk-bt
cpfsk-modulation-index
cpfsk-tone-spacing-hz
effective-snr-basis

10. Validation and Audit

Bundled tooling in tools/ is expected to check:

split sizes
class balance
per-class/per-SNR balance
HDF5 index consistency
split seed disjointness
seed uniqueness within each split
effective SNR consistency
shortcut-feature baselines

11. Paper Framing

Recommended wording:

24-class unified waveform recognition across communication, radar sensing, and ISAC signals
clean synthetic complex-baseband benchmark

Avoid:

real-world dataset
fully realistic RF capture benchmark
complete ISAC channel benchmark