Features Rattlegram - SMS via audio!
COFDMTV is based on COFDM (coded orthogonal frequency-division multiplexing) technology:- 160 ms long OFDM symbols- 6.25 Hz per sub-carrier- 1/8 guard interval- differentially encoded PSK (phase-shift keying) modulation- systematic polar codes for forward error correctionCurrently Modes 14, 15 and 16 are supported:Using either SPC(2048, 1392), SPC(2048, 1056) or SPC(2048, 712) with CRC32C aided SCL decoding and differential QPSK modulation for the payload.Only a bandwidth of 1600 Hz is needed and the transmission of either 85, 128 or 170 bytes take about one second with the leading noise and fancy header disabled.
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Available for Android 8.0 and above