A labelled software-defined radio dataset for PSK demodulation under real RF front-end impairments

An open corpus of 238 conducted software-defined radio captures of M-PSK transmissions, M in {2, 4, 8, 16}, recorded on a single ADALM-Pluto whose transmit port is connected to its own receive port through an SMA coaxial cable with no antenna fitted at any time. Impairments are produced entirely by the radio's own front end: receive gain driven into compression, receive analogue bandwidth set below the occupied signal bandwidth, the composition of the two, and a transmit-level non-stationarity arm, with the AD9363's DC-offset and quadrature tracking loops switched off so that translational bias and I/Q imbalance survive into the samples. Nothing is injected in software. The transmitted payload bits are owned rather than inferred, so all 21,851,280 labelled symbols carry ground truth that was never produced by a receiver decision. Four conventions govern reuse. Symbols are not equalised and the estimated channel response ships separately. The bit mapping is natural rather than Gray. Receive gain is a device setting, not an SNR. Capture tags are unique within this release only, and the receive-gain axis rather than the tag identifies a channel.