Unid OFDM 16-tone 75 Bd, 110 Hz (MS 188-110A App.A modified?)

I had this signal via Twente SDR on USB 14301.8 (cf)  on 28/06/15 (1710z) just in the well-known 20 mt reserved band, an that's a bit odd.

The waveform is an OFDM 16-tone PSK, 75 Bd and 110 Hz shift, sent in burst mode. It is very similar to the obsoleted Standard NATO MIL 188-110A Appendix A without the doppler tone @ 605 Hz and in not-continuous mode.

 

OFDM parameters

There is a Chinese variant of the MIL 188-110A 16 channels: it could be this case, but I could not find info or logs about it. The burst mode could lead to something like a selcall waveform but the ~720mS spaced "pips" looks like a TDMA.

Hope to get more info and/or more records.

A short recording can be downloaded from here:

https://www.dropbox.com/s/e27myozxfsua52v/def-websdr_recording_2015-06-28T19_13_33Z_14300.0kHz.wav?dl=0